WO2022165790A1

WO2022165790A1 - Power-down isolation device and related method

Info

Publication number: WO2022165790A1
Application number: PCT/CN2021/075752
Authority: WO
Inventors: 张志强; 吴青珍; 陈勇
Original assignee: 华为技术有限公司
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2022-08-11
Also published as: CN116762049A

Abstract

The present application discloses a power-down isolation device. The power-down isolation device comprises a first power domain and a second power domain, the first power domain comprises a first isolation module and a first processing module, and the second power domain comprises a second isolation module. Each time the first processing module receives first control information, the first processing module accumulates the number of times that a first session request is allowed to be sent, the first session request being a session request forwarded by the first isolation module to the second isolation module by means of a first request link; after receiving a power-down request, the first isolation module sends a first notification request to the first processing module by means of a second request link; in response to the first notification request, the first processing module clears the accumulated number of times that the first session request is allowed to be sent, and stops receiving the first control information to stop accumulating the number of times that the first session request is allowed to be sent; and the first isolation module disconnects the first request link between the first isolation module and the second isolation module. By using the present application, power-down isolation protection can be performed on a power domain.

Description

A power-off isolation device and related method

technical field

The present application relates to the field of semiconductor technology, and in particular, to a power-down isolation device and related methods.

Background technique

As semiconductor process technology enters the nanometer stage, it has become a reality to integrate hundreds of millions of transistors in a single chip. At present, dozens or more processors can be integrated on a single-chip system-on-chip (SOC), but compared with the traditional bus structure, it cannot effectively support more and more processors. On Chip, NOC) is the most effective solution for multi-processor interconnection.

NOC refers to the integration of a large number of computing resources on a single chip and an on-chip communication network that connects these resources. The NOC includes multiple sub-networks, and these sub-networks can be interconnected through the NOC bus. Each sub-network can also include Multiple subsystems with different functions (such as audio systems, etc.). However, in order to reduce the power consumption of the on-chip network, the NOC bus is split into different power domains according to different functional subsystems, and different power domains can be powered on and off independently according to business scenarios. However, in the actual design process, it is found that when a power domain that is not powered off directly accesses another power domain that is powered off, it will cause the chip system to hang up (for example, in the early sample debugging stage, if the central processing unit CPU accesses the powered off In the power domain, the corresponding response cannot be returned, causing the CPU to not work properly), and the chip system cannot be cleared and maintenance tests can be performed after the system hangs up (for example, the on-chip network of a NOC hangs up, causing the chip to fail to record the chip before reset and restart). The key information at the moment of hang-up, so the abnormal problem is difficult to locate).

Therefore, how to implement power-off isolation protection for the power domain is an urgent problem to be solved.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a power-off isolation device and a related method, so as to implement power-off isolation protection for a power supply domain.

In a first aspect, an embodiment of the present invention provides a power-off isolation device, characterized in that: the power-off isolation device includes a first power domain and a second power domain; the first power domain includes a first isolation module and a first processing module; the second power domain includes a second isolation module; each time the first processing module receives the first control information, it accumulates the number of times the first session request is allowed to be sent; the first session The request is a session request forwarded by the first isolation module to the second isolation module through the first request link; the first isolation module is configured to, after receiving the power-down request, send the request to the second isolation module through the second request link. The first processing module sends a first notification request; the first processing module is configured to, in response to the first notification request, clear the accumulated number of times that the first session request is allowed to be sent, and stop receiving the first session request. control information to stop accumulating the number of times that the first session request is allowed to be sent; the first isolation module is further configured to disconnect from the second session request after the first processing module responds to the first notification request The first request link between modules is isolated.

In this embodiment of the present invention, the master device and the slave device in the power-off isolation device perform transmission and communication based on a virtual channel (Virtual Channel, VC). For example, after the second power domain mentioned above has sent one or more control information, the master device will accumulate one or more times the number of times the session request is allowed to be sent. Sending a session request does not mean that the master device will immediately send a session request, but when the master device needs to send a session request to a slave device, the number of times the master device is allowed to send a session request is reduced by one each time it sends a session request to the slave device. , until the number of times allowed to send session requests is zero, the master device stops sending session requests. Based on the above, the embodiments of the present invention improve the first isolation module of the master device in the power-off isolation device, so that when one of the power domains of the master device or the slave device is powered off, it should be sent to the slave device under abnormal conditions. The session request of the device (for example, the second power domain mentioned above) is no longer sent to the slave device that is about to be disconnected, so as to avoid packet loss and bus hang, so as to implement power-off isolation protection for the power domain. Specifically, after the first isolation module of the master device receives the power-down request, it actively sends a first notification request to the first processing module of the master device, and the first processing module responds to the first notification request to accumulate its accumulated The number of times the session request is allowed to be sent is cleared and no new control information is received, so that the accumulated number of times the session request is allowed to be sent in the first processing module remains zero, and then the first isolation module and the second isolation module are disconnected. The first request link between the master device and the slave device is disconnected, so that when the first processing module of the master device cannot send a session request to the outside, the corresponding first request link is disconnected. A request link, so as to avoid the possibility that if the first request link is disconnected first and then cleared, the first processing module will still send out the slave device (such as the second power domain mentioned above) However, the session request cannot get a response from the slave device, which leads to the bus hang phenomenon in the power domain where the first processing module is located.

In a possible implementation manner, the target responding device of the first session request is the second processing module included in the second power domain; each time the second processing module receives the second control information, the Accumulate the number of times that the first session response is allowed to be sent; the first session response is the response that the second processing module sends to the first processing module through the first response link in response to the first session request; The first isolation module is further configured to send a second notification request to the first processing module through the second request link after disconnecting the first request link; the first processing module, is further configured to stop sending the second control information in response to the second notification request; the first isolation module is further configured to disconnect after the first processing module responds to the second notification request the first response link with the second isolation module.

In this embodiment of the present invention, the master device (for example, the above-mentioned first power supply domain) and the slave device (for example, the above-mentioned second power supply domain) in the power-off isolation device perform transmission communication based on the virtual channel. After one or more times of control information sent by the master device, the slave device will accumulate one or more times the number of times the session response is allowed to be sent. It means that the slave device will send a session request immediately, but when the slave device needs to send a session request to the master device, each time the slave device sends a session response to the master device, the number of times the session response is allowed to be sent is reduced by one, until the session is allowed to be sent. When the number of responses is zero, the slave device stops sending session responses. Based on the above, if after the first isolation module of the master device disconnects the first request link mentioned above, the first isolation module also actively sends a second notification request to the first processing module, and the first processing module responds to the first request The second notification request will stop sending control information to the slave device, and then disconnect the first response link between the first isolation module and the second isolation module, avoiding the need to first disconnect the first response link and then stop sending control information. In this case, the first processing module may still send control information, but the control information cannot be responded by the slave device, which may lead to the phenomenon that the bus hangs up in the power domain where the first processing module is located.

In a possible implementation manner, the first isolation module is further configured to send a session suspension request to the second isolation module through a third request link; the second isolation module is configured to receive the suspension session After the session request, send a third notification request to the second processing module; the second processing module is configured to, in response to the third notification request, stop sending the first control information and stop sending the first control information. A state of a session response; the second isolation module is further configured to send a pause to the first isolation module through the third request link after the second processing module responds to the third notification request A session response; the first isolation module is further configured to receive the session suspension response.

In this embodiment of the present invention, after the above-mentioned first request link and the first response link are disconnected, the slave device (for example, the above-mentioned second power domain) receives a message from the master device (for example, the above-mentioned first power domain After the suspend session request sent by the power domain), the second isolation module in the slave device may also send a third notification request to the second processing module in the slave device, and the second processing module is in a state of stopping to the master device in response to the third notification request. The state of sending control information and session response, so as to avoid that the second processing module will still send control information and session response when the first response link is disconnected, but the control information and session response cannot be responded by the slave device. , which in turn causes the phenomenon that the bus hangs up in the power domain where the second processing module is located.

In a possible implementation manner, each time the first processing module receives the third control information, the number of times that the second session request is allowed to be sent is accumulated once; the target responding device of the second session request is the first Two processing modules; the second session request is a session request sent by the first processing module to the first isolation module through a fourth request link; the first isolation module is further configured to pass the second The request link sends a fourth notification request to the first processing module and sends the third control information through the fourth request link; the first processing module is further configured to: respond to the fourth notification request, send fourth control information to the first isolation module; receive the third control information, and accumulate the number of times that the second session request is allowed to be sent; send the second session request to the first isolation module ; The first isolation module is further configured to: receive the fourth control information, and accumulate the number of times the second session response is allowed to be sent; the second session response is that the first isolation module responds to the second session response a response to a session request and sent to the first processing module through a second response link; responding to the second session request and generating the second session response; sending the second session to the first processing module response; the first processing module is further configured to receive the second session response.

In this embodiment of the present invention, after the first request link and the first response link are disconnected, the slave device (for example, the second power domain mentioned above) no longer receives data from the master device (for example, the above-mentioned first power domain). A session request initiated by a power supply domain), but in an abnormal situation, the master device may still send a session request to the slave device. Therefore, in this embodiment of the present invention, the session request that should have been sent to the disconnected slave device is sent to the power supply. The first isolation module of the domain, so as to avoid the situation that the session request hangs without a response, and further, the first isolation module also informs the first processing module through the second session response that the session request sent by it has not been disconnected from the slave device. real response. Specifically, the first processing module in the master device also responds to the fourth notification request sent by the first isolation module in the master device. At this time, the first processing module resumes and continues to accumulate the number of times that session requests are allowed to be sent, and the first processing module Each time the control information sent by the first isolation module is received, the number of times the session request is allowed to be sent will be accumulated. In the case that the number of times the session request is allowed to be sent is non-zero and the master device is abnormal, the first processing module may send the session sending request that should be responded by the second processing module to the first isolation module. Next, each time the first isolation module receives the control information sent by the first processing module, the number of times the session response is allowed to be sent will be accumulated. In the case that the number of times the session response is allowed to be sent in the first isolation module is non-zero, the first isolation module can send the session response, and at this time, the session request initiated by the first processing module can be responded to. Therefore, when one of the power domains of the master device or the slave device is powered off, the session request that the master device should have sent to the slave device in an abnormal situation is no longer sent to the disconnected slave device but to the first device. Isolate the module, thus avoiding the situation where the bus hangs in the power domain where the master device is located due to the fact that the session request initiated by the master device cannot get the response from the slave device when the link between the master device and the slave device is disconnected. Power-off isolation protection.

In a possible implementation manner, the first isolation module is further configured to send a fifth notification request to the first processing module through the second request link after receiving the power-on request; the first The processing module is further configured to, in response to the fifth notification request, clear the accumulated number of times that the second session request is allowed to be sent, and stop receiving the third control information to stop accumulating the number of times that the second session request is allowed to be sent. number of times; the first isolation module is further configured to disconnect the fourth request link with the first processing module after the first processing module responds to the fifth notification request, and establishing the first request link with the second isolation module.

In this embodiment of the present invention, when one power domain of the master device or the slave device is powered on while the other power domain is always powered on, the master device no longer sends the session request that the second processing module responds to through the first The four-request link is sent to the first isolation module of this power domain to respond. Specifically, after the first isolation module of the master device receives the power-on request, it actively sends a fifth notification request to the first processing module of the slave device, and the first processing module responds to the fifth notification request to accumulate its accumulated The number of times the session request is allowed to be sent is cleared and the control information is no longer received, so that the number of times the first processing module is allowed to send the session request is no longer accumulated, thus ensuring that the first processing module cannot send the session request to the outside. Then disconnect the fourth request link between the first processing module and the first isolation module and establish the first request link between the first isolation module and the second isolation module, so as to avoid disconnecting the fourth request first If the link is cleared again, a session request may still be issued on the first processing module at this time, but the session request cannot be responded to, thereby causing a bus hang phenomenon in the power domain where the first processing module is located.

In a possible implementation manner, the first isolation module is further configured to send a sixth notification to the first processing module through the second request link after disconnecting the fourth request link request; the first processing module is further configured to stop sending the fourth control information in response to the sixth notification request; the first isolation module is further configured to respond to the After the sixth notification request is made, the second response link with the first processing module is disconnected, and the first response link with the second isolation module is established.

In this embodiment of the present invention, if after the first isolation module of the master device disconnects the above-mentioned fourth link, the first isolation module no longer responds to the first processing module and should be processed by the second Session requests that the module responds to. Specifically, the first isolation module actively sends a sixth notification request to the first processing module, and after the first processing module stops sending control information to the first isolation module in response to the sixth notification request, it disconnects the first processing module from the first processing module. The second response link between the isolation modules avoids the possibility that if the second response link is disconnected first and then stops sending control information, the first processing module still sends control information, but the control information cannot be responded to. , which further leads to the phenomenon that the bus hangs up in the power domain where the first processing module is located.

In a possible implementation manner, the first isolation module is further configured to send a session permission request to the second isolation module through the third request link; the second isolation module is configured to receive all After the session permission request is made, send a seventh notification request to the second processing module; the second processing module is configured to respond to the seventh notification request, in the process of allowing the sending of the first control information and allowing the sending of all the state of the first session response; the second isolation module is further configured to send the first isolation module to the first isolation module through the third request link after the second processing module responds to the seventh notification request sending a session permission response; the first isolation module is further configured to receive the session permission response.

In this embodiment of the present invention, after the fourth request link and the second response link are disconnected, the slave device (for example, the above-mentioned second power domain) receives a signal from the master device (for example, the above-mentioned first power supply domain). domain), a seventh notification request may be sent to the second processing module in the slave device, and the second processing module is in a state of allowing sending of control information and session response to the master device in response to the seventh notification request. Next, the slave device sends a session permission response to the master device, which means that the second processing module is in a state of allowing the sending of the first control information and allowing the sending of the first session response.

In a possible implementation manner, the first isolation module is further configured to send an eighth notification request to the first processing module through the second request link; the first processing module is further configured to In response to the eighth notification request, send the second control information and the first session request; the second isolation module is configured to receive the second control information and the first session request, and send the second control information and the first session request The second control information and the first session request are forwarded to the second processing module; the second processing module is configured to: receive the second control information, and accumulate the data that are allowed to send the first session response. generating the first session response in response to the first session request; sending the first session response; the first processing module is further configured to receive the first session response.

In this embodiment of the present invention, after the fourth request link and the second response link are disconnected, the first isolation module no longer responds to the session request that should be responded by the slave device (for example, the second power domain mentioned above). , the session request initiated by the first processing module and responded by the slave device will be sent to the second processing module of the slave device for response. Specifically, in response to the eighth notification request sent by the first isolation module in the master device, the first processing module in the master device resumes and continues to accumulate the number of times the session request is allowed to be sent. Once the control information sent by the master device is received, the number of times the session request is allowed to be sent will be accumulated. In the case that the number of times the session request is allowed to be sent in the first processing module is non-zero, the first processing module may send the session request responded by the second processing module. Next, each time the second processing module of the slave device receives the control information sent by the first processing module, the number of times the session response is allowed to be sent will be accumulated. In the case that the number of times that the slave device is allowed to send the session response is non-zero, the slave device can send the session response, and at this time, the session request initiated by the first processing module obtains the response from the slave device. Therefore, when one power domain of the master device or the slave device is powered on while the other power domain is always powered on, the session request that the master device should have sent to the slave device is no longer sent to the disconnected second power domain. An isolation module responds and sends a response to the slave device, so that when the power domain is powered on, the power domain is prevented from hanging up, and the session is sent from the master device to the slave device while the power domain is isolated and protected. The request can get a normal response.

In a second aspect, an embodiment of the present invention provides a power-off isolation method, which is characterized in that it is applied to a power-off isolation device, and the power-off isolation device includes a first power supply domain and a second power supply domain; the first power supply domain It includes a first isolation module and a first processing module; the second power domain includes a second isolation module; each time the first processing module receives the first control information, it accumulates the number of times that the first session request is allowed to be sent; The first session request is a session request forwarded by the first isolation module to the second isolation module through the first request link; the method includes: after receiving the power-down request through the first isolation module , sending a first notification request to the first processing module through the second request link; in response to the first notification request, the first processing module clears the accumulated number of times that the first session request is allowed to be sent, and stop receiving the first control information to stop accumulating the number of times that the first session request is allowed to be sent; through the first isolation module, after the first processing module responds to the first notification request, disconnect the the first request link between the second isolation modules.

In a possible implementation manner, the target slave device of the first session request is the second processing module included in the second power domain; each time the second processing module receives the second control information, the Accumulate the number of times that the first session response is allowed to be sent; the first session response is the response that the second processing module sends to the first processing module through the first response link in response to the first session request; The method further includes: after disconnecting the first request link through the first isolation module, sending a second notification request to the first processing module through the second request link; A processing module stops sending the second control information in response to the second notification request; the first isolation module disconnects the first processing module from the second notification request after the first processing module responds to the second notification request the first response link between the second isolation modules.

In a possible implementation manner, the method further includes: sending a session suspension request to the second isolation module through the first isolation module through a third request link; receiving the session suspension request through the second isolation module After the session request is suspended, a third notification request is sent to the second processing module; in response to the third notification request, the second processing module is in a state of stopping sending the first control information and stopping sending the first the status of the session response; after the second processing module responds to the third notification request, the second isolation module sends a suspend session response to the first isolation module through the third request link; through The first isolation module receives the suspend session response.

In a possible implementation manner, each time the first processing module receives the third control information, the number of times the second session request is allowed to be sent is accumulated once; the target slave device of the second session request is the first two processing modules; the second session request is a session request sent by the first processing module to the first isolation module through a fourth request link; the method further includes: passing through the first isolation module through the the second request link sends a fourth notification request to the first processing module and sends the third control information through the fourth request link; and responds to the fourth notification request through the first processing module , sending fourth control information to the first isolation module; receiving the third control information, and accumulating the number of times the second session request is allowed to be sent; sending the second session request to the first isolation module; The fourth control information is received by the first isolation module, and the number of times the second session response is allowed to be sent is accumulated; the second session response is that the first isolation module responds to the second session request and passes the second session response. The second response link sends the response to the first processing module; responds to the second session request and generates the second session response; sends the second session response to the first processing module; The first processing module receives the second session response.

In a possible implementation manner, the method further includes: after receiving the power-on request through the first isolation module, sending a fifth notification request to the first processing module through the second request link; The first processing module, in response to the fifth notification request, clears the accumulated number of times that the second session request is allowed to be sent, and stops receiving the third control information to stop accumulating the number of times that the second session request is allowed to be sent. number of times; after the first processing module responds to the fifth notification request, the first isolation module disconnects the fourth request link with the first processing module, and establishes a link with the first processing module. the first request link between the second isolation modules.

In a possible implementation manner, the method further includes: after disconnecting the fourth request link, through the first isolation module, sending a message to the first processing module through the second request link a sixth notification request; in response to the sixth notification request by the first processing module, stop sending the fourth control information; in response to the sixth notification request in the first processing module by the first isolation module After the request is notified, the second response link with the first processing module is disconnected, and the first response link with the second isolation module is established.

In a possible implementation manner, the method further includes: sending a session permission request to the second isolation module through the third request link through the first isolation module; receiving through the second isolation module After the session request is allowed, a seventh notification request is sent to the second processing module; in response to the seventh notification request, the second processing module is in the process of allowing the sending of the first control information and allowing the sending of the The state of the first session response; after the second processing module responds to the seventh notification request through the second isolation module, a session permission response is sent to the first isolation module through the third request link ; Receive the allowed session response by the first isolation module.

In a possible implementation manner, the method further includes: sending, by the first isolation module, an eighth notification request to the first processing module through the second request link; In response to the eighth notification request, the second control information and the first session request are sent; the second control information and the first session request are received by the second isolation module, and the The second control information and the first session request are forwarded to the second processing module; the second control information is received by the second processing module, and the number of times that the first session response is allowed to be sent is accumulated; generating the first session response from the first session request; sending the first session response; and receiving the first session response through the first processing module.

In a third aspect, the present application provides a semiconductor chip, which may include the power-off isolation device involved in any one of the implementation manners of the above-mentioned first aspect.

In a fourth aspect, the present application provides a chip system, where the chip system includes the power-off isolation device involved in any one of the implementation manners of the first aspect. The chip system may be composed of chips, or may include chips and other discrete devices.

In a fifth aspect, the present application provides an electronic device, including a processor and a memory, wherein the memory is used to store program codes, and the processor is used to call the program codes stored in the memory to execute the above-mentioned first aspect. The power-off isolation device involved in any implementation manner.

In a sixth aspect, the present application provides a system-on-a-chip SoC chip, where the SoC chip includes the power-off isolation device involved in any one of the implementation manners of the above-mentioned first aspect. The SoC chip may be composed of chips, or may include chips and other discrete devices.

In a seventh aspect, the present application provides a storage device having the function of implementing any one of the power-off isolation methods in the second aspect above. This function can be implemented by hardware or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In an eighth aspect, the present application provides a terminal, where the terminal includes a host, and the host includes the power-off isolation device involved in any one of the implementation manners of the foregoing first aspect. The terminal may also include a communication interface for the terminal to communicate with other devices or a communication network.

In a ninth aspect, the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a storage device, implements the power-off isolation described in any one of the second aspect above method flow.

In a tenth aspect, an embodiment of the present invention provides a computer program, where the computer program includes instructions, when the computer program is executed by a storage device, the storage device can perform the power-off isolation described in any one of the second aspects above method flow.

Description of drawings

FIG. 1A is a schematic structural diagram of an on-chip network according to an embodiment of the present invention.

FIG. 1B is a schematic diagram of another on-chip network structure provided by an embodiment of the present invention.

FIG. 1C is a schematic diagram of a session transmission manner provided by an embodiment of the present invention.

FIG. 1D is a schematic diagram of a session request provided by an embodiment of the present invention.

FIG. 2A is a schematic diagram of a power-off isolation device according to an embodiment of the present invention.

FIG. 2B is a schematic diagram of another power-off isolation device provided by an embodiment of the present invention.

FIG. 2C is a schematic diagram of a link of a power-off isolation device according to an embodiment of the present invention.

FIG. 2D is a schematic diagram of another power-off isolation device link provided by an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a design of a power-domain boundary implementation of a power-off isolation protection processing device according to an embodiment of the present invention.

FIG. 4A is a schematic flowchart of a power-off isolation method provided by an embodiment of the present invention.

FIG. 4B is a schematic diagram of a user interface for using an application by a user according to an embodiment of the present invention.

Detailed ways

The embodiments of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. The terms "first", "second", "third" and "fourth" in the description and claims of the present application and the drawings are used to distinguish different objects, rather than to describe a specific order . Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally also includes For other steps or units inherent to these processes, methods, products or devices. Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

The terms "component", "module", "system" and the like are used in this specification to refer to a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device may be components. One or more components may reside within a process and/or thread of execution, and a component may be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on information having one or more data packets (such as data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet through which information interacts with other systems) Communicate through local and/or remote processes.

Some terms in this application are explained below to facilitate the understanding of those skilled in the art.

(1) Network On Chip (NOC) is a new communication method of single-chip system chip (System On Chip, SoC), which is the main component of multi-core technology. The NoC approach brings a whole new approach to on-chip communication that significantly outperforms traditional bus-based systems (bus).

(2) Power Domain, many new SoC designs must integrate many functions and achieve very low power consumption, that is, there may be many clock domains, power domains and reset domains in the design. The power domain is an area divided for the total power supply, which facilitates system verification and reduces system power consumption. For example, the modem (MODEM) subsystem, audio subsystem, sensor subsystem, etc., these subsystems are independently powered in the SoC design. When these subsystems are not working, the power supply of the subsystems can be turned off, which can save power consumption . For example, when the MODEM subsystem is in airplane mode, it can be powered off to reduce the power consumption of the chip, but at this time, the audio subsystem can still play music and be powered on. In general, the power domain is divided according to the functional area of SoC.

Based on the technical problems raised above, in order to facilitate understanding of the embodiments of the present invention, the system architecture on which the embodiments of the present invention are based is first described below. The present application provides an on-chip network structure. Please refer to FIG. 1A . FIG. 1A is a schematic diagram of an on-chip network structure provided by an embodiment of the present invention. The on-chip network 20 may be located in any electronic device, such as a computer, a computer, a mobile phone, and a tablet. and other equipment. The network-on-chip 20 may specifically be a chip or a chip set or a circuit board on which the chip or the chip set is mounted. The chip or chip set or the circuit board on which the chip or chip set is mounted can be driven by necessary software. In FIG. 1A, the network-on-chip 20 includes a first subsystem 201, a second subsystem 202, an initial bridge 203, a routing module 204, and a target bridge 205, wherein

The first subsystem 201 is a functional module that provides power from a first power domain, and the first power domain has the functions of independent power-on and independent power-off in the logic circuit. When the first power domain is powered on, it can supply power to the first subsystem 201 to ensure that the first subsystem 201 can work normally; when the first power domain is powered off, it will no longer supply power to the first subsystem 201, The first subsystem 201 will be in a stop working state.

The second subsystem 202 is a functional module that provides power from a second power domain, and the second power domain has functions of independent power-on and independent power-off in the logic circuit. When the second power domain is powered on, it can supply power to the second subsystem 202 to ensure that the second subsystem 202 can work normally; when the second power domain is powered off, it will no longer supply power to the second subsystem 202, The second subsystem 202 will be in a shutdown state.

One or more initial bridges 203 may be included in the first subsystem 201 and the second subsystem 202, and the initial bridges 203 are protocol conversion bridges that convert the interface protocol of the docking device into the network interface protocol of the network-on-chip NOC. In one case, the initial bridge 203 is connected to the main device (such as a graphics processor GPU, etc.). Since the interface protocol between the main device and the NOC internal network is different, when the signal is output from the main device, it will be carried out in the initial bridge 203. The signal protocol is converted so that the signal enters the NOC internal network. In another case, when two different NOCs are interconnected across NOCs, such as NOC0 accessing NOC1, the initial bridge of NOC1 is connected to the target bridge of NOC0, since the two NOCs have independent NOC buses, so the two different NOCs Signals cannot be directly transmitted between them. At this time, before the signal is output from the target bridge, the protocol conversion of the signal is performed in the target bridge according to the protocol rules, and the target bridge transmits the converted signal to the initial bridge of NOC1, and then the initial bridge will According to the received signal, do a protocol conversion again, so that the signal can enter the NOC1 internal network, so as to realize cross-NOC interconnection.

One or more target bridges 205 may be included in the first subsystem 201 and the second subsystem 202, and the target bridges 205 are protocol conversion bridges that convert the NOC internal network protocol to the interface protocol of the docking device. In one case, the target bridge 205 is connected to a slave device (such as a memory, etc.), since the interface protocol between the slave device and the NOC internal network is different, when the signal is output from the NOC internal network, the signal will be transmitted in the target bridge 205. Protocol conversion so that the signal can enter the slave device. In another case, when two different NOCs are interconnected across NOCs, for example, NOC0 accesses NOC1, and the NOC0 target bridge is connected to the initial bridge of NOC1. Since NOC0 and NOC1 have independent NOC buses, the two NOCs cannot communicate with each other. Direct signal transmission. At this time, before the signal is output from the target bridge of NOC0, the protocol conversion of the signal will be carried out in the target bridge according to the protocol rules, and the target bridge will send the converted signal to the initial bridge of NOC1, and then the initial bridge of NOC1. The bridge will perform another protocol conversion according to the received signal, so that the signal can enter the NOC1 internal network, thereby realizing cross-NOC interconnection.

The first subsystem 201 and the second subsystem 202 also include one or more routing modules 204. The routing module 204 is a hardware device connecting two or more networks, and acts as a gateway between the networks. The address in each packet then decides how to transmit it to the dedicated intelligence of the network device. It can understand different protocols, such as the Ethernet protocol used by a local area network, and the TCP/IP protocol used by the Internet. In this way, the routing module can analyze the destination addresses of data packets from various types of networks, convert the addresses of non-TCP/IP networks into TCP/IP addresses, or vice versa; The best route is sent to the specified location. Therefore, the routing module can establish a data connection between the modules of different networks in one subsystem, and can also establish a data connection between the subsystems of two different networks to realize the interaction between the two subsystems. For example, the initial bridge 203 in the first subsystem 201 can access the target bridge in the first subsystem 201 through the routing module in the first subsystem, and can also access the second subsystem through the routing module in the first subsystem. The routing module in the subsystem 202 thus accesses the target bridge in the second subsystem 202 .

For another example, as shown in FIG. 1B , which is a schematic diagram of another on-chip network structure provided by an embodiment of the present invention, the figure includes a first on-chip network 000, a first subsystem 010 powered by a first power domain, and a The second subsystem 020 powered by the second power domain, the first initial bridge 011, the first routing module 012, the first target bridge 013, the link interface 014 across the power domain boundary, the power isolation compartment 030, the second routing module 021 , and the second target bridge 022 is formed. It should be noted that the on-chip network 20 is the first on-chip network 000 in the figure, the initial bridge 203 is the first initial bridge 011 in the figure, the routing module 204 is the first routing module 012 and the second routing module 021 in the figure, and the target bridge 205 is the first target bridge 013 and the second target bridge 022 in the figure. The link interface 014 across the power domain boundary is used to transmit session requests and session responses between the first subsystem 010 and the second subsystem 020, and the power isolation room 030 is used to physically implement a power-off isolation device. In this on-chip network structure, the first initial bridge 011 can access the second routing module 021 through the first routing module 012, and thus can access the second target bridge 022, wherein the session request initiated by the first subsystem 010 can be accessed through the cross-connection The link interface 014 of the power domain boundary is sent to the second subsystem 020, and the second subsystem 020 generates a corresponding session response after responding to the session request, and sends it to the first sub-system through the link interface 014 across the power domain boundary System 010.

It should be noted that the main device connected to the initial bridge 203 in the NOC may be an application processor (application processor, AP), a central processing unit (central processing unit, CPU), a graphics processing unit (graphics processing unit, GPU) , neural-network processing unit (NPU), modem processor, image signal processor (image signal processor, ISP), controller, memory, video codec, digital signal processor (digital signal processor) processor, DSP), baseband processor, etc. For example, the GPU obtains the picture information in the memory, and performs mathematical and geometric calculations according to the picture information to realize graphics rendering and the like.

The slave device connected to the target bridge 205 in the NOC can be Flash flash memory (eg, NAND flash memory, NOR flash memory, etc.), universal flash storage (UFS), embedded multimedia card eMMC, universal flash storage multi-chip package uMCP Memory, embedded multimedia card multi-chip package eMCP memory, solid state drive (SSD), mechanical hard disk (Hard Disk Drive, HDD), etc. For example, the operating data of the mobile phone is stored in the corresponding memory, and the operating conditions of the mobile phone are recorded.

It can be understood that the structure of a system-on-chip in FIG. 1A is only an exemplary implementation in the embodiments of the present application, and the structural architecture of the system-on-chip in the embodiments of the present application includes but is not limited to the above architecture.

To facilitate understanding of the embodiments of the present invention, a virtual channel (Virtual Channel, VC) session transmission mode on which the embodiments of the present invention are based is first described below. The present application provides a session transmission mode, please refer to FIG. 1C , which is a schematic diagram of a session transmission mode provided by an embodiment of the present invention. In the figure, the sender TX 410 includes a sender counter 411, three VC session requests 412, an arbitration The scheduler 413; the receiving end RX 420 includes a receiving end counter 421, a first-in-first-out memory VC FIFO 423, and a demultiplexing selector DEMUX 422. Optionally, the sending end may be located in the routing module of the first subsystem in the above network-on-chip, and the receiving end may be located in the routing module of the second subsystem. The following is the process of interaction between the sender and the receiver:

Step 1: The VC FIFO 423 in the receiving end sends a count request to the receiving end counter 421. The VC FIFO 423 in the receiving end is used to store data. If the VC FIFO 423 has an available buffer depth, a counting request is sent to the receiving end counter 421.

Step 2: The receiver counter 421 receives the count request. Each time the receiver counter 421 receives a count request initiated by the VC FIFO 423, the receiver counter 421 counts up once.

Step 3: The receiver counter 421 sends crdt_x to the transmitter counter 411 . If the receiving end counter 421 is in a non-zero state, the control information crdt_x may be sent to the transmitting end counter 411 , and the receiving end counter 421 is decremented every time one crdt_x is sent.

Step 4: The sender counter 411 receives crdt_x. Each time the sender counter 411 receives a crdt_x sent by the receiver counter 421, the sender counter 411 counts up one time.

Step 5: The sender counter 411 sends a scheduling request to the arbitration scheduler 413 . When the sender counter 411 is in a non-zero state, a scheduling request is sent to the arbitration scheduler 413 .

Step 6: After the arbitration scheduler 413 receives the scheduling request, each time the arbitration scheduler 413 receives a scheduling request sent by the sender counter 411, it will schedule a session request from the three VC session requests 412 and allow it to be sent through the link 430. To the demultiplexing selector DEMUX 422 of the receiving end RX 420.

Step 7: DEMUX 422 receives the request by the session. After receiving the session request, the DEMUX 422 can demultiplex the information in the session request and store it in the VC FIFO 423.

Step 8: The arbitration scheduler 413 sends a scheduling response grant_x to the sender counter 411 every time a session request is completed, and the sender counter 411 decrements the count every time it receives a grant_x.

For example, a master device (eg, the first processing module in the first power domain mentioned above) includes TX1 and RX2, and a slave device (eg, the second processing module in the second power domain mentioned above) includes RX1 and RX2. TX2. TX1 and RX1 are used to control sending session requests, and TX2 and RX2 are used to control sending session responses. For example, TX1 in a master device sends a session request to RX1 in a slave device, after the slave device responds to the session request and generates a corresponding session response, TX2 in the slave device sends the session response to RX2 in the master device. The specific implementation process is as follows:

1. TX1 sends a session request to RX1:

If the first FIFO memory in RX1 has an available cache depth, the first FIFO memory sends a count request to the request receiver counter, and the request receiver counter increases the count once after receiving the count request , at this time, the counter of the request receiver is counted as one, and then a network request credit information (network_request_credit, network_req_crdt) is sent to the counter of the request sender, and the count is decreased by one time, where network_req_crdt is the above-mentioned control information. After the request sender counter receives the network_req_crdt, the count is incremented by one. At this time, the request sender counter counts to one, and the request receiver counter counts to zero. The request sender counter may send a scheduling request to the first arbitration scheduler, and after receiving a scheduling request, the first arbitration scheduler will schedule a session request, such as the first session request, from among the three VC session requests. As shown in FIG. 1D, FIG. 1D is a schematic diagram of a session request provided by an embodiment of the present invention. Optionally, the first session request includes network request payload information (network_request_payload, network_req_pld) and network request VLD information (network_request_VLD) , network_req_vld), the first session request is allowed to be sent to the first demultiplexing selector of the receiver RX1 through the link. After receiving the first session request, the first demultiplexing selector may demultiplex the network_req_pld in the first session request and store it in the first FIFO memory.

2. TX2 sends a session response to RX2:

The slave device generates a session response after responding to the session request sent by the master device. When the slave device sends the session response to the master device, if the second FIFO memory in RX2 has an available buffer depth, the second FIFO memory The first-out memory sends a count request to the counter of the response receiver, and the counter of the receiver of the response receives the count request and increments the count by one time. At this time, the counter of the receiver of the response is counted as one, and then sends a network response credit information to the counter of the sender of the response. After (network_respond_credit, network_rsp_crdt), the count is decremented once, and the response credit information here is the above-mentioned control information. After the counter of the response sender receives the network_rsp_crdt, the count is incremented by one time. At this time, the counter of the response sender is one, and the counter of the response receiver is zero. The response sender counter may send a scheduling request to the second arbitration scheduler, and after receiving the scheduling request, the second arbitration scheduler may schedule a session response, such as the first session response, from the three VC session responses. As shown in FIG. 1D, optionally, the first session response includes network response payload information (network_respond_payload, network_rsp_pld) and network response VLD information (network_respond_VLD, network_rsp_vld), and the first session response is allowed to be sent to the receiver through the link Second demux selector for RX2. After receiving the first session response, the second demultiplexing selector may demultiplex the network_rsp_pld in the session response and store it in the second FIFO memory.

It can be understood that a session transmission manner in FIG. 1C is only an exemplary implementation in the embodiment of the present application, and the session transmission manner in the embodiment of the present application includes but is not limited to the above architecture.

Based on the above-mentioned on-chip network structure and session transmission mode, and in conjunction with an embodiment of a power-off isolation device provided in this application, the technical problems raised in this application are specifically analyzed and solved. Referring to FIG. 2A, FIG. 2A is a schematic diagram of a power-off isolation device according to an embodiment of the present invention. As shown in FIG. 2A, the power-off isolation device 30 includes: a first power supply domain 303 and a second power supply domain 302; a first power supply The domain 303 includes a first isolation module 304 and a first processing module 303; the second power domain 302 includes a second isolation module 305; each time the first processing module 303 receives the first control information, it accumulates one time to allow the first session request to be sent The first session request is the session request forwarded by the first isolation module 304 to the second isolation module 305 through the first request link. in:

The first isolation module 304 is configured to send the first notification request to the first processing module 303 through the second request link after receiving the power-down request. Optionally, when the first power domain is to be changed from the power-on state to the power-off state, if the second power domain is always in the power-on state, the power manager of the chip system sends the power-off state to the first isolation module. request; when the second power domain is about to change from the power-on state to the power-off state, if the first power domain is always in the power-on state, the second power domain sends a power-off request to the first isolation module. After the first isolation module receives the power-down request, the first isolation module sends the first notification request to the first processing module 303 through the second request link, and the second request link is used to transmit the first isolation module 304 and the first The notification request between the processing modules 303. The first notification request is used to instruct the first processing module 303 to reset the accumulated number of session requests allowed to be sent to zero, and stop receiving control information to stop accumulating the number of allowed session requests to be sent.

The first processing module 303 is configured to, in response to the first notification request, clear the accumulated number of times of the request for allowing the first session to be sent, and stop receiving the first control information to stop accumulating the first session that is allowed to be sent. The number of requests. Specifically, after the first processing module 303 receives the first notification request sent by the first isolation module 304, it will reset the accumulated number of times the first session request is allowed to be sent to zero and stop receiving corresponding control information to stop accumulating The number of times the first session request is allowed to be sent.

The first isolation module 304 is further configured to disconnect the first request link with the second isolation module 305 after the first processing module 303 responds to the first notification request. Specifically, after the first processing module 303 stops sending the session request, the first isolation module 304 will disconnect the request link with the second isolation module 305 . For example, when the number of times the first session request is allowed to be sent in the first processing module 303 is two, the first processing module 303 sends two session requests to the outside in sequence and forwards them to the slave device through the first request link. At this time, the first isolation module 304 directly disconnects the first request link, and the two session requests initiated by the first processing module 303 cannot be sent to the slave device, which will result in the two session requests not getting a response, causing the system-on-a-chip There are packet loss and hang up.

In the embodiment of the present invention, the master device and the slave device in the power-off isolation device perform transmission communication based on a virtual channel (Virtual Channel, VC), the master device is the device that initiates the session request, and the slave device is the device that responds to the session response. When the master device (such as the first power domain mentioned above) receives one or more control messages sent by the slave device (such as the second power domain mentioned above), the master device will accumulate one or more allow-sending sessions The number of requests, when the number of times allowed to send session requests is non-zero, it means that the master device is allowed to send session requests, which does not mean that the master device will immediately send a session request, but when the master device needs to send a session request to the slave device, Each time the device sends a session request to the slave device, the number of times the session request is allowed to be sent is reduced by one, until the number of times the session request is allowed to be sent is zero, the master device stops sending the session request. Based on the above, in the embodiment of the present invention, by improving the first isolation module of the master device in the power-off isolation device, when one of the power domains of the master device or the slave device is powered off, the transmission that should be sent to the slave device (for example, the above-mentioned The session request of the mentioned second power domain) is no longer sent to the slave device about to be disconnected, so as to avoid the phenomenon of packet loss and bus hang, so as to realize the power-off isolation protection for the power domain. Specifically, after the first isolation module of the master device receives the power-down request, it actively sends a first notification request to the first processing module of the master device, and the first processing module responds to the first notification request to accumulate its accumulated The number of times the session request is allowed to be sent is cleared and no new control information is received, so that the accumulated number of times the session request is allowed to be sent in the first processing module remains zero, and then the first isolation module and the second isolation module are disconnected. The first request link between the master device and the slave device is disconnected, so that when the first processing module of the master device cannot send a session request to the outside, the corresponding first request link is disconnected. A request link, so as to avoid the possibility that if the first request link is disconnected first and then cleared, the first processing module will still send out the slave device (such as the second power domain mentioned above) However, the session request cannot get a response from the slave device, which leads to the bus hang phenomenon in the power domain where the first processing module is located.

By implementing the embodiment of the present invention, the first isolation module 304 in the power-off isolation device is improved, so that the first isolation module 304 can control the first processing module 303 to be in the state of suspending sending session requests, and then disconnect from the second isolation module The request link between the modules 305, thus avoiding the possibility that if the first request link is disconnected first and then cleared, the session request that should be responded by the slave device will still be sent on the first processing module 303. The session request needs to be forwarded to the slave device by the first isolation module through the first request link, but after the first request link is disconnected, the slave device cannot receive the session request, so the session request cannot get a response from the slave device, and further As a result, the bus hang phenomenon occurs in the power domain where the first processing module 303 is located.

In a possible implementation manner, as shown in FIG. 2B , which is a schematic diagram of another power-off isolation apparatus provided by an embodiment of the present invention, the target slave device of the first session request is the second power domain The second processing module included in the . The first session request and the response sent to the first processing module 303 through the first response link; the first isolation module 304 is further configured to pass the second request link after disconnecting the first request link Send a second notification request to the first processing module 303; the first processing module 303 is further configured to stop sending the second control information in response to the second notification request; the first isolation module 304 is further configured to A processing module 303 disconnects the first response link with the second isolation module 305 after responding to the second notification request.

Optionally, if the first processing module 303 has initiated multiple session requests before the first isolation module 304 disconnects the first request link mentioned above, and the first isolation module 304 passes these session requests through the first The request link has been forwarded to the second processing module 306, and the second processing module 306 will generate corresponding session responses in response to these session requests. 303 generates the second control information, so the accumulative number of times the second processing module 306 is allowed to send the session response is non-zero, and the second processing module 306 sends the generated session response to the first processing through the first response link in turn. Module 303. After the second processing module 306 has sent the above-mentioned session response, the first isolation module 304 will send a second notification request to the first processing module 303, and the first processing module 303 will stop sending the first notification request in response to the second notification request. Second control information, so that the second processing module 306 can no longer receive new second control information and cannot continue to accumulate the number of times that the first session response is allowed to be sent. Next, the first isolation module 304 will disconnect the first response link with the second isolation module 305, so that the session response generated by the second processing module 306 in an abnormal situation cannot be obtained from the first response link mentioned above. The route is sent to the first processing module 303 to avoid the phenomenon of packet loss and bus hang, so as to implement power-off isolation protection for the power supply domain. It should be noted that the second control information is generated by the first processing module 303 and sent to the first isolation module 304, and then the first isolation module 304 sends it to the second isolation module 305 through the first response link and forwards it to the second isolation module 304. Processing module information.

For example, before the first isolation module 304 disconnects the first request link, the first processing module 303 initiates two session requests, and the second processing module 306 receives the two session requests and responds to the two sessions Two corresponding session responses were generated after the request. If the second processing module 306 receives three pieces of second control information generated by the first processing module 303, and the second processing module 306 accumulates three times that the session response is allowed to be sent, the second processing module 306 can send the first processing The module 303 returns a corresponding session response. After the second processing module 306 returns the two session responses, the number of times the second processing module 306 is allowed to send session responses is one. After the first processing module 303 responds to the second notification request sent by the first isolation module 304, the first isolation module 304 will disconnect the first response link with the second isolation module 305, so that the second processing module 306 cannot receive new second control information, so the second processing module 306 no longer accumulates the number of times the session response is allowed to be sent.

In a possible implementation manner, as shown in FIG. 2B , the first isolation module 304 is further configured to send a session suspension request to the second isolation module 305 through the third request link; the second isolation module 305 is configured to receive After the session suspension request, send a third notification request to the second processing module 306; the second processing module 306 is configured to, in response to the third notification request, stop sending the first control information and stop sending the The state of the first session response; the second isolation module 305 is further configured to send a pause session response to the first isolation module 304 through the third request link after the second processing module 306 responds to the third notification request ; The first isolation module 304 is further configured to receive the suspend session response.

For example, before the first isolation module 304 disconnects the first request link, the first processing module 303 initiates two session requests, and the second processing module 306 receives the two session requests and responds to the two sessions Two corresponding session responses were generated after the request. If the second processing module 306 receives three pieces of second control information generated by the first processing module 303, and the second processing module 306 accumulates three times that the session response is allowed to be sent, the second processing module 306 can send the first processing The module 303 returns the corresponding session response. After the second processing module 306 returns the two session responses, the number of times the second processing module 306 is allowed to send the session response is one, and the second processing module 306 is still in the state of allowing the session response to be sent. state. After the first processing module 303 no longer sends the second control information after responding to the second notification request, the first isolation module 304 will disconnect the first response link with the second isolation module 305, so that the second processing module 306 cannot receive new second control information through the first response link, so the number of times the second processing module 306 is allowed to send a session response is kept as one. At this time, the first isolation module 304 may send a session suspension request to the second isolation module 305, and after receiving the session suspension request, the second isolation module 305 may send a third notification request to the second processing module 306, and the second processing module 306 In response to the third notification request, the second processing module 306 no longer sends the first control information to the master device, and sets the previously accumulated number of times the session response is allowed to be sent to zero to stop sending the session response out. Next, the second isolation module 305 sends a suspend session response to the first isolation module 304, indicating that the second processing module 306 is in a state of stopping sending the first control information and stopping sending the first session response. It should be noted that the first control information is generated by the second processing module 306 and sent to the second isolation module 305, and then the second isolation module 305 sends it to the first isolation module 304 through the first request link and forwards it to the first isolation module 305. Processing module 303 information.

Optionally, the second processing module 306 can actively configure the cache depth of the VC FIFO as required, thereby determining the number of times the second processing module 306 can send the first control information to the outside, thus reducing the chip area overhead.

In a possible implementation manner, as shown in FIG. 2B , each time the first processing module 303 receives the third control information, it accumulates the number of times the second session request is allowed to be sent; the target of the second session request is from The device is the second processing module 306; the second session request is a session request sent by the first processing module 303 to the first isolation module 304 through the fourth request link; the first isolation module 304 is further configured to pass the The second request link sends a fourth notification request to the first processing module 303 and sends the third control information through the fourth request link; the first processing module 303 is further configured to: respond to the fourth notification request , send the fourth control information to the first isolation module 304; receive the third control information, and accumulate the number of times the second session request is allowed to be sent; send the second session request to the first isolation module 304; the first The isolation module 304 is further configured to: receive the fourth control information, and accumulate the number of times that the second session response is allowed to be sent; the second session response is that the first isolation module 304 responds to the second session request and passes the first The second response link sends the response to the first processing module 303; responds to the second session request and generates the second session response; sends the second session response to the first processing module 303; the first processing module 303 , and is further used to receive the second session response.

Specifically, after the first isolation module 304 disconnects the first request link and the first response link, the first processing module 303 responds to the fourth notification request sent by the first isolation module 304. At this time, the first processing module 303 The accumulated number of times the session request is allowed to be sent is no longer kept zero at all times, and each time the first processing module 303 receives the third control information sent by the first isolation module 304, the number of times the second session request is allowed to be sent will be accumulated once. When the number of times allowed to send the second session request in the first processing module 303 is non-zero, the first processing module 303 can send the second session request through the fourth request link under abnormal conditions, and at this time, the first isolation module 304 Instead of the second processing module 306 responding to the session request, the session request is responded to. Next, the first processing module 303 may send the fourth control information through the second response link, and each time the first isolation module 304 receives the fourth control information sent by the first processing module 303, it will allow the sending of the second control information once. The number of session responses. When the number of times allowed to send a session response in the first isolation module 304 is non-zero, the first isolation module 304 may send the second session response through the second response link, and the first processing module 303 may receive the second session response at this time . After the first isolation module 304 responds to the second session request initiated by the first processing module 303 and generates a second session response, the second session response is sent to the first processing module 303 through the second response link. Optionally, the second session response mentioned above is a dummy dummy response, and the dummy dummy response can facilitate subsequent maintenance testing of the chip system.

It should be noted that the first processing module sends the second session request only when the accumulated number of times the first processing module is allowed to send the second session request is non-zero and the first processing module is abnormal, and the initial second session request The target responding device is the second processing module 306, but because one of the first power domain or the second power domain needs to be powered off, and cannot perform cross-power domain interaction, the device that actually responds to the second session request is The first isolation module 304 . Optionally, the first isolation module 304 can actively configure the cache depth of the VC FIFO as required, thereby determining the number of times the first isolation module 304 can send the third control information to the outside, thus reducing the chip area overhead.

For example, after the first isolation module 304 disconnects the first request link and the first response link, the first isolation module 304 may send a notification request to the first processing module 303, and the first processing module 303 responds to the notification request Afterwards, the accumulated number of times the session request is allowed to be sent in the first processing module 303 may no longer remain zero at all times, and if the first processing module 303 receives the control information, it starts accumulating the number of times the session request is allowed to be sent. After the first processing module 303 receives the third control information sent by the first isolation module 304 through the fourth request link, and the accumulated number of times the session request is allowed to be sent is one, then the first processing module 303 under abnormal conditions The session request that should be sent to the second processing module 306 will be sent to the first isolation module 304 through the fourth request link, and the first processing module 303 will send an or a plurality of fourth control information, at this time, the first isolation module 304 responds to the session request and generates a corresponding session response, because the first isolation module 304 receives one or more of the first processing module 303 through the second response link If the fourth control information is sent, the number of times that the first isolation module 304 is allowed to send the session response is not zero, and the first isolation module 304 is in a state of allowing the session response to be sent. The first isolation module 304 sends the generated session response to the first processing module 303 through the second response link. It should be noted that the above-mentioned session response may be a dummy dummy response, and the dummy dummy response may facilitate subsequent maintenance testing of the chip system.

In this embodiment of the present invention, after the first request link and the first response link are disconnected, the slave device (for example, the second power domain mentioned above) no longer receives data from the master device (for example, the above-mentioned first power domain). A session request initiated by a power supply domain), but in an abnormal situation, the master device may still send a session request to the slave device. Therefore, in this embodiment of the present invention, the session request that should have been sent to the disconnected slave device is sent to the power supply. The first isolation module of the domain, so as to avoid the situation that the session request hangs without a response, further, the first isolation module also informs the first processing module through the second session response that the session request sent by it has not been disconnected from the slave device. real response. Specifically, the first processing module in the master device also responds to the fourth notification request sent by the first isolation module in the master device. At this time, the first processing module resumes and continues to accumulate the number of times that session requests are allowed to be sent, and the first processing module Each time the control information sent by the first isolation module is received, the number of times the session request is allowed to be sent will be accumulated. In the case that the number of times the session request is allowed to be sent is non-zero and the master device is abnormal, the first processing module may send the session sending request that should be responded by the second processing module to the first isolation module. Next, each time the first isolation module receives the control information sent by the first processing module, the number of times the session response is allowed to be sent will be accumulated. In the case that the number of times the session response is allowed to be sent in the first isolation module is non-zero, the first isolation module can send the session response, and at this time, the session request initiated by the first processing module can be responded to. Therefore, when one of the power domains of the master device or the slave device is powered off, the session request that the master device should have sent to the slave device in an abnormal situation is no longer sent to the disconnected slave device but to the first isolation device. module, so as to avoid the situation that the session request initiated by the master device cannot get the response from the slave device when the link between the master device and the slave device is disconnected. Power-off isolation protection.

In a possible implementation manner, as shown in FIG. 2C , FIG. 2C is a schematic diagram of a link of a power-off isolation device provided by an embodiment of the present invention. The first isolation module 304 is further configured to receive a power-on request and pass The second request link sends a fifth notification request to the first processing module 303; the first processing module 303 is further configured to, in response to the fifth notification request, clear the accumulated number of times that the second session request is allowed to be sent, and Stop receiving the third control information to stop accumulating the number of times that the second session request is allowed to be sent; the first isolation module 304 is further configured to disconnect the communication with the first processing module 303 after responding to the fifth notification request. The fourth request link between the first processing module 303 and the first request link with the second isolation module 305 are established.

Optionally, when the first power domain is to be changed from the power-off state to the power-on state, if the second power domain is in the power-on state at this time, the power manager of the chip system sends the power-on state to the first isolation module 304. request; when the second power domain is to change from the power-off state to the power-on state, if the first power domain is in the power-on state, the second power domain sends a power-on request to the first isolation module 304 .

Specifically, when the first power domain is to be changed from the power-down state to the power-on state but the second power domain is always in the power-on state or the second power domain is to be changed from the power-down state to the power-on state but the first power domain is always in the power-on state In the case of the power-on state, after receiving the power-on request, the first isolation module 304 actively sends a fifth notification request to the first processing module 303, and the first processing module 303 responds to the fifth notification request and sends its accumulated permission to send the fifth notification request. The number of second session requests is cleared and the third control information is no longer received, so that the accumulated number of times the second session request is allowed to be sent in the first processing module 303 remains zero, so that the first processing module 303 cannot send the session request to the outside world. . Next, the first isolation module 304 will disconnect the fourth request link with the first processing module 303 and establish the first request link with the second isolation module 305 . It should be noted that when the power domain is powered on, after the first isolation module 304 disconnects the fourth request link, if the first processing module 303 is in the state of allowing the session request to be sent, the first processing module 303 can again Sending session requests, at this time, the first isolation module 304 no longer responds to these session requests, but forwards these session requests to the second isolation module 305 through the first request link, so that the session requests of the first processing module 303 can be obtained The normal response realizes the isolation protection of the power domain.

In this embodiment of the present invention, when one power domain of the master device or the slave device is powered on while the other power domain is always powered on, the master device no longer sends the session request that the second processing module responds to through the first The four-request link is sent to the first isolation module of this power domain to respond. Specifically, after receiving the power-on request from the first isolation module of the slave device, it actively sends a fifth notification request to the first processing module of the master device, and the first processing module responds to the fifth notification request to accumulate its accumulated The number of times the session request is allowed to be sent is cleared and the control information is no longer received, so that the first processing module no longer accumulates the number of times the session request is allowed to be sent, thus ensuring that the first processing module cannot send the session request to the outside. Then disconnect the fourth request link between the first processing module and the first isolation module and establish the first request link between the first isolation module and the second isolation module, so as to avoid disconnecting the fourth request first If the link is cleared again, a session request may still be issued on the first processing module at this time, but the session request cannot be responded to, thereby causing a bus hang phenomenon in the power domain where the first processing module is located.

In a possible implementation manner, as shown in FIG. 2D , FIG. 2D is a schematic diagram of another power-off isolation device link provided by an embodiment of the present invention. The first isolation module 304 is further configured to disconnect the first isolation device. After the four request links, send a sixth notification request to the first processing module 303 through the second request link; the first processing module 303 is further configured to stop sending the fourth notification request in response to the sixth notification request control information; the first isolation module 304 is further configured to disconnect the second response link with the first processing module 303 after the first processing module 303 responds to the sixth notification request, and establish and The first response link between the second isolation modules 305 .

Optionally, if the first processing module 303 initiates a plurality of second session requests under abnormal conditions before the first isolation module 304 disconnects the fourth request link mentioned above, and the first isolation module 304 The second session requests have been forwarded to the first isolation module 304 through the fourth request link, and the first isolation module 304 will respond to these second session requests and generate corresponding second session responses. The fourth control information sent by the first processing module 303 is received before the power domain is powered on, so the accumulated number of times the second session response is allowed to be sent in the first isolation module 304 is non-zero, and the first isolation module 304 will generate the The second session response is sequentially sent to the first processing module 303 through the second response link. Optionally, after the first isolation module 304 sends the second session response mentioned above, the first isolation module 304 sends a sixth notification request to the first processing module 303, and the first processing module 303 responds to the sixth notification. request, will stop sending the fourth control information, so that the first isolation module 304 can no longer receive new fourth control information and cannot continue to accumulate the number of times that the second session response is allowed to be sent. Next, the first isolation module 304 will disconnect the second response link with the first processing module 303, and establish a first response link with the second isolation module 305, so that the first response link is The session response generated by the isolation module 304 cannot be sent to the first processing module 303 from the above-mentioned second response link, so as to implement isolation protection for the power supply domain.

For example, before the first isolation module 304 disconnects the fourth request link, under abnormal conditions, the first processing module 303 initiates two slave devices (for example, the second one in the second power domain mentioned above). processing module) response session requests, and the first isolation module 304 generates two corresponding session responses after receiving the two session requests and responding to the two session requests. If the first isolation module 304 receives three fourth control messages generated by the first processing module 303, and the accumulated number of times the first isolation module 304 is allowed to send session responses is three, the first isolation module 304 can send the first processing The module 303 returns a corresponding session response. Optionally, after the first isolation module 303 returns the two session responses, the accumulated number of times the first isolation module 304 is allowed to send the session response is one, and the first isolation module 304 is still in the allowable state. The status of the sent session response. After the first processing module 303 responds to the sixth notification request sent by the first isolation module 304, the first isolation module 304 will disconnect the second response link with the first processing module 303, so that the first isolation module 304 cannot receive the new fourth control information, so the number of times that the first isolation module 304 is allowed to send a session response is kept as one.

In a possible implementation manner, as shown in FIG. 2D , the first isolation module 304 is further configured to send a session permission request to the second isolation module 305 through the third request link; the second isolation module 305 is configured to use After receiving the session permission request, send a seventh notification request to the second processing module 306; the second processing module 306 is configured to, in response to the seventh notification request, allow the sending of the first control information and the sending of the first control information. The state of the first session response; the second isolation module 305 is further configured to send permission to the first isolation module 304 through the third request link after the second processing module 306 responds to the seventh notification request Session response; the first isolation module 304 is further configured to receive the allow session response.

Specifically, after the first isolation module 304 disconnects the fourth request link and the second response link, the first isolation module 304 may send a session permission request to the second isolation module 305 through the third request link, and the second After receiving the session permission request, the isolation module 305 can send a seventh notification request to the second processing module 306, and the second processing module 306 responds to the seventh notification request and is in the state of allowing the sending of the first control information and allowing the sending of the first session response. status. Next, the second isolation module 305 sends a session permission response to the first isolation module 304, indicating that the second processing module 306 is in a state of allowing the sending of the first control information and allowing the sending of the first session response.

For example, before the first isolation module 304 disconnects the fourth request link, under abnormal conditions, the first processing module 303 initiates two slave devices (for example, the second one in the second power domain mentioned above). processing module), and the first isolation module 304 receives the two session requests that should be responded by the second processing module 306 and generates two corresponding session responses after responding to the two session requests. If the first isolation module 304 receives three fourth control messages generated by the first processing module 303, and the accumulated number of session responses allowed to be sent by the first isolation module 304 is three, the first isolation module 304 can send the first processing The module 303 returns the corresponding session response. After the first isolation module 303 returns the two session responses, the number of times the first isolation module 304 is allowed to send the session response is one, and the first isolation module 304 is still in the state of allowing the session response to be sent. state. When the first processing module 303 no longer sends the fourth control information, the first isolation module 304 will disconnect the second response link with the first processing module 303, so that the first isolation module 304 cannot receive new The fourth control information, so the accumulated number of times the session response is allowed to be sent by the first isolation module 304 remains as one. At this time, the first isolation module 304 may send a session permission request to the second isolation module 305. After receiving the session permission request, the second isolation module 305 may send a seventh notification request to the second processing module 306. The second processing module 306 In response to the seventh notification request, the second processing module 306 is in a state where the first control information can be resent and the session response is allowed to be sent. Next, the second isolation module 305 sends a session permission response to the first isolation module 304, indicating that the second processing module 306 is in a state where the first control information can be resent and the session response is permitted to be sent. It should be noted that the first control information is generated by the second processing module 306 and sent to the second isolation module 305, and then the second isolation module 305 sends it to the first isolation module 304 through the first request link and forwards it to the first isolation module 305. The signal of the processing module 303 .

In a possible implementation manner, the first isolation module 304 is further configured to send an eighth notification request to the first processing module 303 through the second request link; the first processing module 303 is further configured to respond to the The eighth notification request, sending the second control information and the first session request; the second isolation module 305, configured to receive the second control information and the first session request, and send the second control information and the first session request. The control information and the first session request are forwarded to the second processing module 306; the second processing module 306 is configured to: receive the second control information, and accumulate the number of times that the first session response is allowed to be sent; respond to the The first session request generates the first session response; sends the first session response; and the first processing module 303 is further configured to receive the first session response.

Specifically, after the first isolation module 304 disconnects the fourth request link and the second response link, the first processing module 303 responds to the eighth notification request sent by the first isolation module 304. At this time, the first processing module 303 The accumulated number of times the session request is allowed to be sent is no longer kept zero at all times, and the first processing module 303 accumulates the number of times the first session request is allowed to be sent each time it receives the first control information sent by the second processing module 306 . When the number of times allowed to send the first session request in the first processing module 303 is non-zero, the first processing module 303 can send the first session request through the first request link, and at this time, the second processing module 306 responds to the session request, Instead the first isolation module 304 responds to the session request. Next, the first processing module 303 can send the second control information through the first response link, and each time the second processing module 306 receives the second control information sent by the first processing module 303, it will allow the sending of the first The number of times the session responded. When the number of times allowed to send session responses in the second processing module 306 is non-zero, the second processing module 306 may send the first session response through the first response link, and the first processing module 303 receives the first session response at this time. After the second processing module 306 responds to the first session request initiated by the first processing module 303 and generates a first session response, it sends the first session response to the first processing module 303 through the first response link, completing the A response to the session request initiated by the first processing module 303 .

It should be noted that, since the initial target slave device of the first session request and the second session request is the second processing module 306, but a power-off process needs to be performed in one of the first power domain or the second power domain In this case, the cross-power domain interaction cannot be performed, so that the device that actually responds to the second session request is the first isolation module 304 . The second session response returned by the first isolation module 304 is used to notify the first processing module 303 that the session request has not received a response from the target slave device. The first session response generated by the second processing module 306 is a response after the second processing module 306 completes the request according to the session request.

For example, after the first isolation module 304 disconnects the fourth request link and the second response link, the first isolation module 304 may send a notification request to the first processing module 303, and the first processing module 303 responds to the notification request Afterwards, the accumulated number of times the session request is allowed to be sent in the first processing module 303 may no longer remain zero at all times, and if the first processing module 303 receives the control information, it starts accumulating the number of times the session request is allowed to be sent. After the first processing module 303 receives the first control information generated by the second processing module 306, and the accumulated number of times the first session request is allowed to be sent is one, the first processing module 303 can send the first session request through the first request link. A first session request is sent to the second processing module 306, and the first processing module 303 will send one or more second control information to the second processing module 306 through the first response link. At this time, the second processing module 306 responds In response to the first session request and the corresponding first session response is generated, since the second processing module 306 receives one or more second control information sent by the first processing module 303 through the first response link, in the second The number of times the session response is allowed to be sent in the processing module 306 is non-zero, and at this time, the second processing module 306 is in a state of allowing the session response to be sent. The second processing module 306 sends the generated first session response to the first processing module 303 through the first response link to complete the cross-power domain interaction between the first power domain and the second power domain, avoiding the Packet loss and system-on-chip hang-up caused by power-on or power-off state changes.

In this embodiment of the present invention, after the fourth request link and the second response link are disconnected, the first isolation module no longer responds to the session request that should be responded by the slave device (for example, the second power domain mentioned above). , the session request initiated by the first processing module and responded by the slave device will be sent to the second processing module of the slave device for response. Specifically, in response to the eighth notification request sent by the first isolation module in the master device, the first processing module in the master device resumes and continues to accumulate the number of times the session request is allowed to be sent. Once the control information sent by the master device is received, the number of times the session request is allowed to be sent will be accumulated. In the case that the number of times the session request is allowed to be sent in the first processing module is non-zero, the first processing module may send the session request responded by the second processing module. Next, each time the second processing module of the slave device receives the control information sent by the first processing module, the number of times the session response is allowed to be sent will be accumulated. In the case that the number of times that the slave device is allowed to send the session response is non-zero, the slave device can send the session response, and at this time, the session request initiated by the first processing module obtains the response from the slave device. Therefore, when one power domain of the master device or the slave device is powered on while the other power domain is always powered on, the session request that the master device should have sent to the slave device is no longer sent to the disconnected second power domain. An isolation module responds by sending a response to the slave device, so that when the power domain is powered on, the power domain is prevented from hanging up, and the session is sent from the master device to the slave device while the power domain is isolated and protected. The request can get a normal response.

In order to describe the power-off isolation device in the embodiment of the present application in more detail, based on the above-mentioned on-chip network structure and session transmission mode, an exemplary description is given below with reference to FIG. 3 , which is a power domain boundary implementation provided by an embodiment of the present invention. Schematic diagram of the design structure of the power-off isolation protection processing device.

As shown in FIG. 3 , when the first power domain 301 in FIGS. 2A-2D is the PD-A510 in FIG. 3 , the second power domain 302 is the PD-B 520 in FIG. 3 , and the first processing module 303 is the PD-B 520 in FIG. 3 In the Master 511, the first isolation module 304 is the PD_M 512 in FIG. 3, the second isolation module 305 is the PD_S 521 in FIG. 3, the second processing module 306 is the Slave 522 in FIG. 3, and the first request link is For link 530 in FIG. 3 , the first response link is link 531 in FIG. 3 . 540 in Fig. 3 is the handshake signal between PD_M 512 and PD_S 521, which cooperates to realize the establishment and disconnection of the link 530 and link 531 of the power domain boundary; 550 in Fig. 3 is the handshake signal between the power manager and PD_M 512 , which is used to control the power-on and power-off processing of the power domain boundary link where PD-M512 is located; 560 in Figure 3 is the handshake signal between the power manager and PD_S 521, which is used to control the power domain boundary link where PD-S 521 is located. power-on and power-off processing. The work flow of the power-off isolation device provided by the embodiment of the present invention includes the work flow in the following four cases. in,

(1) Workflow for power failure on the Master 511 side:

Step 1: The system power manager requests the power boundary between PD-A 510 and PD-B 520 to enter a power-down isolation state by setting pwrd_a_req in 550 to 1. It is characterized by sending a power-down request to the first isolation module 304 as mentioned above.

Step 2: When PD_M512 receives pwrd_a_req as 1, if the internal state records, PD-B520 has been in a power-down state, then go to Step 5, otherwise go to Step 3. It should be noted that, after the first isolation module 304 receives the power-down request, if the second power domain is in the power-down state, the power is directly powered off, and if the second power domain is in the power-on state, subsequent disconnection processing is required.

Step 3: PD_M 512 performs the following processing in sequence:

Step 3.1: Set pwrdm_tx(515) to 1, requesting that the Master 511 does not allow sending new requests through the link 513, and then set tx_crdt_cnt_x to 0 inside the Master 511 and keep it. It is characterized by the above-mentioned, the first isolation module 304 sends the first notification request to the first processing module 303, the first processing module 303 responds to the first notification request, clears the accumulated number of times that the first session request is allowed to be sent, and Stop receiving the first control information to stop accumulating the number of times that the first session request is allowed to be sent.

Step 3.2: Wait for the responses corresponding to the requests sent through the link 513 to be returned through the link 514 . Link 513 and link 514 are used to forward the session request initiated by Master 511 and the session response generated by Slave 522.

Step 3.3: Set pwrd_rx_req516 to 1 and request Master511 to set its internal rx_crdt_cnt_x to the reset value and keep it. The feature corresponds to the above-mentioned, the first isolation module 304 sends the second notification request to the first processing module 303, and the first processing module 303 stops sending the second control information in response to the second notification request.

Step 3.4: Disconnect link 513 and link 530, disconnect link 514 and link 531, and connect link 513 and link 514 to the default slave device Default Slave in PD_M.

Step 3.5: Set pwrdm_tx515 and pwrd_rx_req516 to 0 at the same time, allow tx_crdt_cnt_x of Master 511 to receive credit, and allow it to send a request through link 513, and rx_crdt_cnt_x to send credit; subsequently, the request sent by Master 511 through link 513 is processed by Default Slave. Link 514 returns Dummy's response, implementing power-down isolation protection. Its characteristics correspond to the above-mentioned, the first isolation module 304 is further configured to send the fourth notification request to the first processing module 303 through the second request link and send the third control information through the fourth request link; the first processing The module 303 is further configured to, in response to the fourth notification request, send fourth control information to the first isolation module 304; receive the third control information, and accumulate the number of second session requests allowed to be sent; The second session request; the first isolation module 304 is further configured to receive the fourth control information and accumulate the number of times the second session response is allowed to be sent; the second session response is that the first isolation module 304 responds to the second session request and passes the second session request. The response link sends the response to the first processing module 303; responds to the second session request and generates a second session response; sends the second session response to the first processing module 303; the first processing module 303 is further configured to receive the second session response Session response.

Step 3.6: Set conn_req540 to 1, notify PD_S521 to perform Slave522 side chain disconnection processing, and go to Step 4. The feature corresponds to the above-mentioned, the first isolation module 304 is further configured to send a session suspension request to the second isolation module 305 through the third request link.

Step 4: After PD_S521 performs the following processing in parallel, go to Step 5

Step 4.1: Set pwrds_rx525 to 1, request Slave522 to set its rx_crdt_cnt_x to the reset value, do not allow to return credit, and keep it. Its characteristics correspond to the above-mentioned, the second isolation module 305 is configured to send a third notification request to the second processing module 306 after receiving the session suspension request; the second processing module 306 is configured to respond to the third notification request and be in The state of stopping sending the first control information.

Step 4.2: Set pwrds_tx526 to 1, request Slave522 to set its internal tx_crdt_cnt_x to 0, and keep it. Its characteristics correspond to the above-mentioned, the second processing module 306 is used to respond to the third notification request, stop sending the state of the first session response; the first session response is that the second processing module 306 responds to the first session request and passes The first response link sends the response to the first processing module 303 .

Step 4.3: Set conn_ack540 to 1; corresponding to the above-mentioned, the second isolation module 305 is also used to send the request to the first isolation module 304 through the third request link after the second processing module 306 responds to the third notification request Send a suspend session response.

Step 5: PD_M512 sets pwrd_a_ack550 to 1 to complete the power-down process.

(2) Workflow of Master power-on:

Step 1: The system power manager requests the power boundary between PD-A 510 and PD-B 520 to enter the power-on state by setting pwrd_a_req in 550 to 0. Corresponding to the above-mentioned, the first isolation module 304 is configured to receive a power-on request.

Step 2: When PD_M512 receives pwrd_a_req as 0, if the internal state records, PD-B520 has been in a power-down state, then go to Step 5, otherwise go to Step 3. It should be noted that, after the first isolation module 304 receives the power-on request, if the second power domain is in a power-down state, the power is directly powered on, and if the second power domain is in a power-on state, subsequent link establishment processing is required.

Step 3: PD_M 512 performs the following processing in sequence:

Step 3.1: Set pwrdm_tx515 to 1, requesting Master 511 not to send new requests through link 513, and then set tx_crdt_cnt_x to 0 inside Master 511 and keep it. Its characteristics correspond to the above-mentioned, the first isolation module 304 sends the fifth notification request to the first processing module 303, and the first processing module 303, in response to the fifth notification request, clears the accumulated number of times that the second session request is allowed to be sent, and Stop receiving the third control information to stop accumulating the number of times that the second session request is allowed to be sent.

Step 3.2: Wait for the responses corresponding to the requests sent through the link 513 to be returned through the link 514 .

Step 3.3: Set pwrd_rx_req516 to 1 and request Master511 to set its internal rx_crdt_cnt_x to the reset value and keep it. Its characteristics correspond to the above-mentioned, after disconnecting the fourth request link, the first isolation module 304 sends the sixth notification request to the first processing module 303 through the second request link; the first processing module 303 responds to The sixth notification request is to stop sending the fourth control information.

Step 3.4: Disconnect the link 513 and link 514 from the Default Slave, and set the rx_crdt_cnt_x on the RX side of the Default Slave connected to the link 513 to the reset value, and do not allow to return credit, and connect the TX to the link 514 The tx_crdt_cnt_x of the side is set to 0; the link 513 is connected to the link 530, and the link 514 is connected to the link 531. Its characteristics correspond to the above mentioned, the first isolation module 304 disconnects the fourth request link with the first processing module 303, and establishes the first request link with the second isolation module 305; the first isolation module 304 disconnects the second response link with the first processing module 303 and establishes the first response link with the second isolation module 305 .

Step 3.5: Set pwrdm_tx515 to 0, allow tx_crdt_cnt_x of Master511 to receive credit, and allow it to send requests through link 513.

Step 3.6: Set conn_req540 to 1, notify PD_S521 to perform Slave522 side chain construction, and go to Step 4. Corresponding to the above mentioned, the first isolation module 304 sends a session permission request to the second isolation module 305 through the third request link.

Step 4: After PD_S521 performs the following processing in parallel, go to Step 6:

Step 4.1: Set pwrds_rx525 to 0, allowing Slave522 to return its internal rx_crdt_cnt_x to credit. The feature corresponds to the above-mentioned, after the second isolation module 305 receives the session permission request, it sends the seventh notification request to the second processing module 306; Control information and status that allows the first session response to be sent.

Step 4.2: Set pwrds_tx526 to 0, allow Slave522 to return a response through its internal link 524, and allow tx_crdt_cnt_x in Slave522 to receive credit.

Step 4.3: Set conn_ack540 to 1. Corresponding to the above, after the second processing module 306 responds to the seventh notification request, the second isolation module 305 sends a session permission response to the first isolation module 304 through the third request link.

Step 5: PD_M512 sets pwrd_a_ack550 to 0 to complete the power-on process.

Step 6: After PD_M512 performs the following processing, go to Step 5:

Step 6.1: Set pwrd_rx_req516 to 0 to allow rx_crdt_cnt_x to send credit.

(3) The workflow of the power failure on the Slave side:

Step 1: The system power manager requests the power boundary between PD-A 510 and PD-B 520 to enter a power-down isolation state by setting pwrd_b_req in 560 to 1.

Step 2: When PD_S521 receives pwrd_b_req as 1, if the internal state records, PD-A510 has been in a power-down state, then go to step 5, otherwise set slv_pwron to 0, and go to step 3;

Step 3: PD_M 512 performs the following processing in sequence:

Step 3.1: Set pwrdm_tx515 to 1, requesting Master 511 not to send new requests through link 513, and then set tx_crdt_cnt_x to 0 inside Master 511 and keep it.

Step 3.2: Wait for the response corresponding to the request sent through the link 513 to be returned through the link 514;

Step 3.3: Set pwrd_rx_req516 to 1 and request Master511 to set its internal rx_crdt_cnt_x to the reset value and keep it.

Step 3.4: Disconnect link 513 and link 530, disconnect link 514 and link 531, connect link 513 and link 514 with Default Slave in PD_M 512;

Step 3.5: Set pwrdm_tx515 and pwrd_rx_req516 to 0 at the same time, allow tx_crdt_cnt_x of Master 511 to receive credit, and allow it to send a request through link 513, and rx_crdt_cnt_x to send credit; subsequently, the request sent by Master 511 through link 513 is processed by Default Slave. Link 514 returns Dummy's response, implementing power-down isolation protection.

Step 3.6: Set conn_req540 to 1, notify PD_S521 to perform Slave522 side chain disconnection processing, and go to Step 4.

Step 4: After PD_S521 performs the following processing in parallel, go to Step 5:

Step 4.1: Set pwrds_rx525 to 1, request Slave522 to set its internal rx_crdt_cnt_x to the reset value, do not allow to return credit, and keep it.

Step 4.2: Set pwrds_tx526 to 1, request Slave522 to set its internal tx_crdt_cnt_x to 0, and keep it.

Step 4.3: Set conn_ack540 to 1.

Step 5: PD_M512 sets pwrd_b_ack560 to 1 to complete the power-down process.

(4) The workflow of power-on on the Slave side:

Step 1: The system power manager requests the power boundary between PD-A 510 and PD-B 520 to enter the power-on state by setting pwrd_b_req in 560 to 0.

Step 2: When PD_S521 receives pwrd_b_req as 0, if the internal state records, PD-A510 has been powered down, then go to Step 5, otherwise set slv_pwron to 1, and go to Step 3.

Step 3: PD_M 512 performs the following processing in sequence:

Step 3.4: Disconnect the link 513 and link 514 from the Default Slave, and set the rx_crdt_cnt_x on the RX side of the Default Slave connected to the link 513 to the reset value, and do not allow to return credit, and connect the TX to the link 514 The tx_crdt_cnt_x of the side is set to 0; the link 513 is connected to the link 530, and the link 514 is connected to the link 531.

Step 3.5: Set pwrdm_tx515 to 0, allow tx_crdt_cnt_x of Master 511 to receive credit, and allow it to send requests through link 513;

Step 3.6: Set conn_req540 to 1, notify PD_S521 to perform Slave522 side chain construction, and go to Step 4;

Step 4: After PD_S521 performs the following processing in parallel, it enters Step 5 and Step 6 in parallel:

Step 4.1: Set pwrds_rx525 to 0, allowing Slave522 to return its internal rx_crdt_cnt_x to credit;

Step 4.2: Set pwrds_tx526 to 0, allow Slave522 to return a response through link 524link, and allow tx_crdt_cnt_x in Slave522 to receive credit;

Step 4.3: Set conn_ack540 to 1.

Step 5: PD_S521 sets pwrd_b_ack560 to 0 to complete the power-on process.

Step 6: After PD_M512 is processed as follows:

Step 6.1: Set pwrd_rx_req516 to 0 to allow rx_crdt_cnt_x to send credit;

It should be noted that only when the PD_M or PD_S completes the power-on or power-off processing process and enters the power-on or power-off state, will it accept a new power-on or power-off request.

The apparatus of the embodiment of the present invention is described in detail above, and the related method of the embodiment of the present invention is provided below.

Please refer to FIG. 4A . FIG. 4A is a schematic flowchart of a power-off isolation method provided by an embodiment of the present invention. The method is applicable to any of the power-off isolation devices in the above-mentioned FIGS. 2A to 2D and includes the power-off isolation device. device equipment. The method may include the following steps S401-S403. The power-off isolation device includes a first power domain and a second power domain; the first power domain includes a first isolation module and a first processing module; the second power domain includes a second isolation module; the first processing module Each time the first control information is received, the number of times that the first session request is allowed to be sent is accumulated once; session request. in:

Step S401: after receiving the power-down request, the first isolation module sends a first notification request to the first processing module through the second request link;

Step S402: the first processing module, in response to the first notification request, clears the accumulated number of times the first session request is allowed to be sent, and stops receiving the first control information to stop accumulating the number of times that the first session request is allowed to be sent;

Step S403: After the first processing module responds to the first notification request, the first isolation module disconnects the first request link with the second isolation module.

It should be noted that, the implementation of each step in the power-off isolation method described in the embodiment of the present invention is completed in the power-off isolation device in the device embodiment, and details are not repeated here.

Referring to FIG. 4B , FIG. 4B is a schematic diagram of a user interface for using an application provided by an embodiment of the present invention. A power-off isolation device provided by an embodiment of the present invention is applied to an electronic device. For the relevant description of the power-off isolation device, reference may be made to the relevant descriptions in FIG. 2A to FIG. 2D above, which will not be repeated here. As shown in Figure 4B, when the user wants to run a social application installed on the electronic device, such as WeChat

For the application program, please refer to the user interface 71 in FIG. 4B, at this time, the user can click WeChat through the input device of the electronic device such as the display screen

icon 701. Next, please refer to the user interface 72. At this time, through the account input box 702 and the password input box 703, the user is prompted to log in to WeChat by filling in the account number and password.

The application interface is the user interface 73 . Assuming that the user clicks the chat window with user Arvin, if the storage module storing the chat record is in a power-off state, a flashback will appear to enter the user interface 71 at this time. By applying the embodiment of the present invention to the electronic device, the electronic device can be avoided. A crash when accessing a powered-down module.

The present application provides a semiconductor chip, which may include the power-off isolation device involved in any one of the implementation manners of the first aspect.

The present application provides a chip system, where the chip system includes the power-off isolation device involved in any one of the implementation manners of the first aspect above. The chip system may be composed of chips, or may include chips and other discrete devices.

The present application provides an electronic device, including a processor and a memory, wherein the memory is used for storing program codes, and the processor is used for calling the program codes stored in the memory to execute any one of the above-mentioned first aspects. The power-off isolation device involved in the method.

The present application provides a system-on-chip SoC chip, where the SoC chip includes the power-off isolation device involved in any one of the implementation manners of the first aspect. The SoC chip may be composed of chips, or may include chips and other discrete devices.

The present application provides a storage device having the function of implementing any one of the power-off isolation methods in the second aspect above. This function can be implemented by hardware or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

The present application provides a terminal, where the terminal includes a host, and the host includes the power-off isolation device involved in any one of the implementation manners of the above-mentioned first aspect. The terminal may also include a communication interface for the terminal to communicate with other devices or a communication network.

The present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a storage device, implements the flow of the power-off isolation method according to any one of the second aspect above.

An embodiment of the present invention provides a computer program, where the computer program includes instructions, when the computer program is executed by a storage device, the storage device can execute the flow of the power-off isolation method described in any one of the second aspect above.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

It should be noted that, for the sake of simple description, the foregoing method embodiments are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Because in accordance with the present application, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the device embodiments described above are only illustrative. For example, the division of the above-mentioned units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical or other forms.

The units described above as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

If the above-mentioned integrated units are implemented in the form of software functional units and sold or used as independent products, they may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc., specifically a processor in the computer device) to execute all or part of the steps of the foregoing methods in the various embodiments of the present application. Wherein, the aforementioned storage medium may include: U disk, mobile hard disk, magnetic disk, optical disk, Read-Only Memory (Read-Only Memory, abbreviation: ROM) or Random Access Memory (Random Access Memory, abbreviation: RAM), etc. A medium that can store program code.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions described in the embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present application.

Claims

A power-off isolation device is characterized in that, comprising: the power-off isolation device includes a first power supply domain and a second power supply domain; the first power supply domain includes a first isolation module and a first processing module; the first power supply domain includes a first isolation module and a first processing module; The second power domain includes a second isolation module; each time the first processing module receives the first control information, it accumulates the number of times the first session request is allowed to be sent; the first session request is sent by the first isolation module A session request forwarded to the second isolation module through the first request link;

The first isolation module is configured to send a first notification request to the first processing module through the second request link after receiving the power-down request;

The first processing module is configured to, in response to the first notification request, clear the accumulated number of times of the first session request allowed to be sent, and stop receiving the first control information to stop accumulating the first allowed to send the first session request. the number of session requests;

The first isolation module is further configured to disconnect the first request link with the second isolation module after the first processing module responds to the first notification request.
The apparatus according to claim 1, wherein the target responding device of the first session request is a second processing module included in the second power domain; each time the second processing module receives the second control information, the number of times the first session response is allowed to be sent is accumulated once; the first session response is that the second processing module responds to the first session request and sends it to the first processing module through the first response link the module's response;

The first isolation module is further configured to send a second notification request to the first processing module through the second request link after disconnecting the first request link;

The first processing module is further configured to stop sending the second control information in response to the second notification request;

The first isolation module is further configured to disconnect the first response link with the second isolation module after the first processing module responds to the second notification request.
The apparatus according to claim 2, wherein the first isolation module is further configured to send a session suspension request to the second isolation module through a third request link;

the second isolation module, configured to send a third notification request to the second processing module after receiving the session suspension request;

The second processing module is configured to, in response to the third notification request, be in a state of stopping sending the first control information and stopping sending the first session response;

The second isolation module is further configured to send a session suspension response to the first isolation module through the third request link after the second processing module responds to the third notification request;

The first isolation module is further configured to receive the session suspension response.
The device according to any one of claims 1-3, wherein each time the first processing module receives the third control information, the number of times the second session request is allowed to be sent is accumulated once; The target response device is the second processing module; the second session request is a session request sent by the first processing module to the first isolation module through a fourth request link;

The first isolation module is further configured to send a fourth notification request to the first processing module through the second request link and send the third control information through the fourth request link;

The first processing module is also used for:

In response to the fourth notification request, sending fourth control information to the first isolation module;

receiving the third control information, and accumulating the number of times that the second session request is allowed to be sent;

sending the second session request to the first isolation module;

The first isolation module is also used for:

Receiving the fourth control information, and accumulating the number of times that the second session response is allowed to be sent; the second session response is that the first isolation module responds to the second session request and sends it to the user through the second response link. Describe the response of the first processing module;

responding to the second session request and generating the second session response;

sending the second session response to the first processing module;

The first processing module is further configured to receive the second session response.
The device according to any one of claims 2-4, wherein the first isolation module is further configured to, after receiving a power-on request, send a fifth request to the first processing module through the second request link notification request;

The first processing module is further configured to, in response to the fifth notification request, clear the accumulated number of times that the second session request is allowed to be sent, and stop receiving the third control information to stop accumulating the number of times that the second session request is allowed to be sent. The number of two-session requests;

The first isolation module is further configured to disconnect the fourth request link with the first processing module after the first processing module responds to the fifth notification request, and establish a link with the first processing module. the first request link between the second isolation modules.
The apparatus according to claim 5, wherein the first isolation module is further configured to, after disconnecting the fourth request link, send the request to the first processing module through the second request link send a sixth notification request;

The first processing module is further configured to stop sending the fourth control information in response to the sixth notification request;

The first isolation module is further configured to disconnect the second response link with the first processing module after the first processing module responds to the sixth notification request, and establish a connection with the first processing module. the first response link between the second isolation modules.
The device according to any one of claims 5-6, wherein the first isolation module is further configured to send a session permission request to the second isolation module through the third request link;

the second isolation module, configured to send a seventh notification request to the second processing module after receiving the session permission request;

the second processing module, configured to be in a state of allowing the sending of the first control information and allowing the sending of the first session response in response to the seventh notification request;

The second isolation module is further configured to send a session permission response to the first isolation module through the third request link after the second processing module responds to the seventh notification request;

The first isolation module is further configured to receive the session permission response.
The device according to any one of claims 5-7, wherein the first isolation module is further configured to send an eighth notification request to the first processing module through the second request link;

The first processing module is further configured to send the second control information and the first session request in response to the eighth notification request;

The second isolation module is configured to receive the second control information and the first session request, and forward the second control information and the first session request to the second processing module;

The second processing module is used for:

receiving the second control information, and accumulating the number of times the first session response is allowed to be sent;

generating the first session response in response to the first session request;

sending the first session response;

The first processing module is further configured to receive the first session response.
A power-off isolation method, characterized in that it is applied to a power-off isolation device, the power-off isolation device includes a first power supply domain and a second power supply domain; the first power supply domain includes a first isolation module and a first processing The second power domain includes a second isolation module; each time the first processing module receives the first control information, it accumulates the number of times that the first session request is allowed to be sent; The first isolation module forwards the session request to the second isolation module through the first request link; the method includes:

After receiving the power-down request through the first isolation module, send a first notification request to the first processing module through a second request link;

In response to the first notification request, the first processing module clears the accumulated number of times the first session request is allowed to be sent, and stops receiving the first control information to stop accumulating the first session request allowed to be sent the number of times;

Through the first isolation module, after the first processing module responds to the first notification request, the first request link with the second isolation module is disconnected.
The method according to claim 9, wherein the target slave device of the first session request is a second processing module included in the second power domain; each time the second processing module receives a second control information, the number of times the first session response is allowed to be sent is accumulated once; the first session response is that the second processing module responds to the first session request and sends it to the first processing module through the first response link the response of the module; the method further includes:

After disconnecting the first request link through the first isolation module, send a second notification request to the first processing module through the second request link;

Stop sending the second control information by the first processing module in response to the second notification request;

After the first processing module responds to the second notification request by the first isolation module, the first response link with the second isolation module is disconnected.
The method of claim 10, wherein the method further comprises:

Send a session suspension request to the second isolation module through the first isolation module through a third request link;

After receiving the session suspension request by the second isolation module, send a third notification request to the second processing module;

In response to the third notification request, the second processing module is in a state of stopping sending the first control information and stopping sending the first session response;

After the second processing module responds to the third notification request by the second isolation module, sending a session suspension response to the first isolation module through the third request link;

The suspend session response is received by the first isolation module.
The method according to any one of claims 9-11, wherein each time the first processing module receives the third control information, the number of times the second session request is allowed to be sent is accumulated once; The target slave device is the second processing module; the second session request is a session request sent by the first processing module to the first isolation module through a fourth request link; the method further includes:

Send a fourth notification request to the first processing module through the first isolation module through the second request link and send the third control information through the fourth request link;

In response to the fourth notification request, the first processing module sends fourth control information to the first isolation module; receives the third control information, and accumulates the number of times that the second session request is allowed to be sent; sending the second session request to the first isolation module;

The fourth control information is received by the first isolation module, and the number of times the second session response is allowed to be sent is accumulated; the second session response is that the first isolation module responds to the second session request and passes the second session response. The second response link sends the response to the first processing module; responds to the second session request and generates the second session response; sends the second session response to the first processing module;

The second session response is received by the first processing module.
The method according to any of claims 10-12, wherein the method further comprises:

After receiving the power-on request through the first isolation module, send a fifth notification request to the first processing module through the second request link;

In response to the fifth notification request, the first processing module clears the accumulated number of times the second session request is allowed to be sent, and stops receiving the third control information to stop accumulating the second session request allowed to be sent the number of times;

After the first processing module responds to the fifth notification request, the first isolation module disconnects the fourth request link with the first processing module, and establishes a link with the first processing module. the first request link between two isolation modules.
The method of claim 13, wherein the method further comprises:

After disconnecting the fourth request link through the first isolation module, send a sixth notification request to the first processing module through the second request link;

Stop sending the fourth control information by the first processing module in response to the sixth notification request;

After the first processing module responds to the sixth notification request, the first isolation module disconnects the second response link with the first processing module, and establishes a link with the first processing module. the first response link between two isolation modules.
The method according to any of claims 13-14, wherein the method further comprises:

Send a session permission request to the second isolation module through the third request link by the first isolation module;

After receiving the session permission request through the second isolation module, send a seventh notification request to the second processing module;

Responding to the seventh notification request by the second processing module, being in a state of allowing the sending of the first control information and allowing the sending of the first session response;

After the second processing module responds to the seventh notification request by the second isolation module, send a session permission response to the first isolation module through the third request link;

The allow session response is received by the first isolation module.
The method according to any of claims 13-15, wherein the method further comprises:

Send an eighth notification request to the first processing module through the first isolation module through the second request link;

Sending the second control information and the first session request by the first processing module in response to the eighth notification request;

receiving the second control information and the first session request by the second isolation module, and forwarding the second control information and the first session request to the second processing module;

The second control information is received by the second processing module, and the number of times the first session response is allowed to be sent is accumulated; the first session response is generated in response to the first session request; the first session response is sent ;

The first session response is received by the first processing module.
A computer-readable storage medium, characterized in that, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described in any one of the preceding claims 9-16 is implemented.
A computer program, characterized in that the computer-readable program includes instructions that, when the computer program is executed by a processor, cause the processor to perform the method according to any one of the preceding claims 9-16 .