CN113485957B - Multi-protocol system control device and multi-protocol system control method for physical layer suitable for industrial-level application scene - Google Patents
Multi-protocol system control device and multi-protocol system control method for physical layer suitable for industrial-level application scene Download PDFInfo
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- CN113485957B CN113485957B CN202110714935.6A CN202110714935A CN113485957B CN 113485957 B CN113485957 B CN 113485957B CN 202110714935 A CN202110714935 A CN 202110714935A CN 113485957 B CN113485957 B CN 113485957B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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Abstract
The embodiment of the invention provides a multi-protocol system control device and a multi-protocol system control method for a physical layer, which are suitable for industrial application scenes. The multiprotocol system control device includes: the system comprises a bus interface selection module and a protocol controller module, wherein the bus interface selection module is connected with a system bus, the protocol controller module comprises a plurality of bus protocol controllers and a physical layer interface selector, the bus interface selection module is respectively connected with the plurality of bus protocol controllers in the protocol controller module, and the physical layer interface selector interacts with a physical layer and is respectively connected with the plurality of bus protocol controllers; the bus interface selection module is used for receiving a downlink transmission signal sent to the physical layer through a system bus and receiving a protocol control selection signal sent to the physical layer from an upper layer system; the physical layer interface selector is configured to receive a protocol control selection signal sent from the upper layer system to the physical layer, wherein the plurality of bus protocol controllers share the same interface address for the upper layer system.
Description
Technical Field
The embodiment of the invention relates to an embedded system, in particular to a multi-protocol system control device and a multi-protocol system control method for a physical layer, which are suitable for industrial application scenes.
Background
The rapid development of embedded processing technology has placed increasing demands on data processing capacity and transmission storage speed, and has also created serious challenges in the high-speed interconnection of high-performance embedded systems.
In order to improve the transmission capability of the bus, the conventional bus is usually implemented by increasing the width of the data bus or increasing the frequency of the bus. For example, the PCI bus supports working frequencies of 25M, 33M, 50M and 66M, the PCI-X bus is a bus structure obtained on the basis of the PCI bus structure, the PCI bus is compatible with the PCI bus in hardware and software, the PCI-X bus can support 32bit and 64bit buses, the working frequencies are 66M and 133M, and for 64bit PCI-X, if the bus working frequency is 133MHz, the peak transmission bandwidth can reach 133×64 bit=8.512 Gbps.
This bottleneck problem of data transfer by increasing the bit width and frequency of the conventional bus is not a sensible and viable solution. For parallel buses, the increasing data bit width and bus frequency, while meeting the demands of people for high-speed data transmission to some extent, also brings new problems. Too many pins make chip packaging and placement and routing complex and difficult to do. Another problem is that when the operating frequency of a conventional bus exceeds 133MHz, it is difficult for devices supported on the bus to exceed two. Adding devices to the bus increases the capacitive load, which means that charge must be filled or drained to achieve the desired signal level. Thus, the extra capacitance will increase the rise and fall times of the signal, limiting the operating frequency of the bus. In addition, the problems of offset tolerance of clocks and signals and the like of the traditional bus are further highlighted.
Therefore, with the development of technology in the electronic industry, particularly in the development of transmission interfaces, IEEE1284 is replaced by USB interfaces, PATA is replaced by SATA, and PCI is replaced by PCI-Express, none of them prove that the speed of the conventional parallel interface has reached a bottleneck, and instead, a serial interface with a faster speed is used, so SerDes technology originally used for optical fiber communication is becoming the mainstream of high-speed serial interfaces. The serial interface mainly uses differential signal transmission technology, has the characteristics of low power consumption, strong interference resistance and high speed, and theoretically, the highest transmission rate of the serial interface can reach more than 10 Gbps.
With the widespread use of SerDes interfaces, scene demands are also increasing. To accommodate the different numbers and protocol types, the problem of selecting and integrating the upper layer transport protocol of the SerDes PHY becomes more and more prominent. While existing IC implementations basically interface a single SerDes PHY with a single protocol. Its flexibility and applicability are limited.
When there are multiple application scenarios, supporting multi-protocol connection to SerDes PHY becomes a problem to be solved.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a device and a method for controlling a multiprotocol system for a physical layer, which are suitable for industrial application scenarios, so as to support signal transmission of multiple bus protocols through the same multiprotocol system control device.
An aspect of an embodiment of the present invention provides a multiprotocol system control device for a physical layer, which is applicable to an industrial-level application scenario, including: the system comprises a bus interface selection module and a protocol controller module, wherein the bus interface selection module is connected with a system bus, the protocol controller module comprises a plurality of bus protocol controllers connected with the bus interface selection module and a physical layer interface selector, the bus interface selection module is respectively connected with the plurality of bus protocol controllers in the protocol controller module, and the physical layer interface selector interacts with the physical layer and is respectively connected with the plurality of bus protocol controllers; the bus interface selection module is used for receiving a downlink transmission signal sent to the physical layer through a system bus and receiving a protocol control selection signal sent to the physical layer from an upper layer system; the physical layer interface selector is configured to receive a protocol control selection signal sent from an upper layer system to a physical layer. The bus interface selection module is further configured to send the received downlink transmission signal to a corresponding bus protocol controller in the protocol controller module for processing, and send an uplink transmission signal processed by the corresponding bus protocol controller to the upper layer system, where the physical layer interface selector is further configured to select, according to the received protocol control selection signal, to send the downlink transmission signal processed by the corresponding bus protocol controller in the protocol controller module to a physical layer for sending, and send the uplink transmission signal from the physical layer to the corresponding bus protocol controller in the protocol controller module for processing.
Optionally, the bus interface selection module includes a data bus selection unit, and the data bus selection unit is connected with the data bus and connected with a plurality of bus protocol controllers in the protocol controller module respectively.
Optionally, the bus interface selection module further includes a configuration bus selection unit, where the configuration bus selection unit is connected to the configuration bus or receives the configuration register signal, and is connected to the plurality of bus protocol controllers in the protocol controller module respectively.
Optionally, the multiple multi-protocol system control devices are multiple, and each multi-protocol system control device corresponds to one system bus, and the system bus includes at least one data bus and/or at least one configuration bus.
Optionally, the physical layer interface selector interacts with the physical layer and the plurality of bus protocol controllers, respectively, using a PIPE protocol.
Optionally, the protocol control select signal corresponds to one of a PCIe protocol, a SATA protocol, and a RapidIO protocol.
Another aspect of the embodiments of the present invention provides a method for controlling a multiprotocol system for a physical layer, which is applicable to an industrial-level application scenario, and the method is used for any of the foregoing multiprotocol system control devices, and includes: when receiving a protocol control selection signal sent from an upper layer system to a physical layer, the bus interface selection module switches a downlink transmission signal sent to the physical layer through a system bus to a bus protocol controller corresponding to the protocol control selection signal, the physical layer interface selector sends the downlink transmission signal processed by a corresponding bus protocol controller in the protocol controller module to the physical layer for transmission, the physical layer interface selector sends an uplink transmission signal from the physical layer to a corresponding bus protocol controller in the protocol controller module for processing, and the bus interface selection module sends the uplink transmission signal processed by the corresponding bus protocol controller to the upper layer system.
Optionally, the bus interface selection module includes a data bus selection unit, where the data bus selection unit is connected to the data bus and is respectively connected to a plurality of bus protocol controllers in the protocol controller module, where when signal transmission occurs on the data bus, a protocol control selection signal from an upper layer of the system is provided to the data bus selection unit, and the data bus selection unit sends the received downlink data signal to a corresponding bus protocol controller in the protocol controller module for processing according to the received protocol control selection signal, and sends an uplink data signal processed by the corresponding bus protocol controller to an upper layer system.
Optionally, the bus interface selection module further includes a configuration bus selection unit, where the configuration bus selection unit is connected to the configuration bus or receives the configuration register signal, and is connected to the plurality of bus protocol controllers in the protocol controller module respectively. When data transmission occurs on the configuration bus or a configuration register signal is received, a protocol control selection signal from an upper layer of the system is provided to the configuration bus selection unit, and the configuration bus selection unit sends the received downlink configuration control signal to a corresponding bus protocol controller in a protocol controller module for processing according to the received protocol control selection signal, and sends an uplink configuration control signal processed by the corresponding bus protocol controller to an upper layer system.
Optionally, the physical layer interface selector interacts with the physical layer and the plurality of bus protocol controllers, respectively, using a PIPE protocol.
The multi-protocol system control device and the multi-protocol system control method for the physical layer, which are suitable for the industrial application scene, can support a plurality of bus protocols in the same multi-protocol system control device 100, and the solution is simple and efficient. In addition, the configuration of the bus protocol can be selected through software implementation, so that the bus protocol is flexible and convenient.
Drawings
Fig. 1 is a block diagram illustrating a multi-protocol system control apparatus 100 suitable for use in an industrial-level application scenario according to some embodiments of the present invention;
fig. 2 is a block diagram illustrating a configuration of a multi-protocol system control apparatus 100 suitable for an industrial-level application scenario according to other embodiments of the present invention;
fig. 3 is a flowchart illustrating a multi-protocol system control method according to an embodiment of the present invention.
Detailed Description
The following description of embodiments of the present invention will be made in further detail with reference to the drawings (like numerals designate like elements throughout the several views) and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The multi-protocol system control device suitable for the industrial application scene is arranged in the embedded system and operates at the bottom layer of the embedded system. Specifically, the interface layer between the operating system and the physical layer runs. The multi-protocol system control device is provided with a bus protocol controller capable of supporting various bus protocols, and performs protocol switching and control on downlink transmission signals and uplink transmission signals transmitted through a system bus according to the used bus protocol, so that the multi-protocol system control device can support data transmission of various buses.
In the solution according to an embodiment of the invention, in order for the same multi-protocol system control device to support a plurality of bus protocols, a control terminal in the embedded system performing bus operations provides the multi-protocol system control device with a protocol control selection signal indicating the type of bus protocol, depending on the protocol type of the system bus.
Fig. 1 is a block diagram illustrating a configuration of a multi-protocol system control apparatus 100 suitable for an industrial-level application scenario according to some embodiments of the present invention.
Referring to fig. 1, a multi-protocol system control apparatus 100 suitable for an industrial-level application scenario includes a bus interface selection module 110 and a protocol controller module 120. Wherein, the bus interface selection module 110 is used for interfacing with the upper layer system for bus signal transmission; the protocol controller module 120 is configured to implement switching control of the bus protocol under control of the bus interface selection module 110; the physical layer interface selector 122 is used to interact with the physical layer 500.
Specifically, the bus interface selection module 110 is connected to the system bus, and the protocol controller module 120 includes a plurality of bus protocol controllers 121 (121-1, 121-2, …, 121-n) and a physical layer interface selector 122 connected to the bus interface selection module 110; the bus interface selection module 110 is respectively connected with a plurality of bus protocol controllers 121 (121-1, 121-2, …, 121-n) in the protocol controller module 120, and the physical layer interface selector 122 interacts with the physical layer 500 and is respectively connected with the plurality of bus protocol controllers 121 (121-1, 121-2, …, 121-n).
As described above, the upper layer system of the multi-protocol system control apparatus 100 (i.e., the control side that issues an instruction in the embedded system) can recognize the type of the system bus to which the bus interface is connected, and provide the multi-protocol system control apparatus 100 with a protocol control selection signal for indicating the type of the bus protocol when signal transmission occurs, or the register of the system layer can be used as the protocol control selection signal when the CPU of the embedded system issues an instruction for configuring the register. The protocol control select signal is transmitted to the bus interface selection module 110 and the physical layer interface selector 122.
Accordingly, the bus interface selection module 110 is configured to receive a downlink transmission signal sent to the physical layer 500 through the system bus, and to receive a protocol control selection signal sent to the physical layer 500 from an upper layer system.
The physical layer interface selector 122 is also configured to receive the protocol control selection signal sent from the upper layer system to the physical layer 500.
According to an exemplary embodiment of the present invention, the PIPE protocol may be used for interaction between the physical layer interface selector 122 and the physical layer 500 and between the physical layer interface selector 122 and the plurality of bus protocol controllers 121 (121-1, 121-2, …, 121-n).
Furthermore, for the upper layer system, the plurality of bus protocol controllers 121121 (121-1, 121-2, …, 121-n) share the same interface address. That is, at the system level, the same interface address is used for signal transmission through the system bus, so that the internal protocol switching of the multi-protocol system control apparatus 100 is transparent to the upper system.
The protocol switching process of the multi-protocol system control apparatus 100 at the time of signal transmission on the system bus will be specifically described below.
When the system bus is signaled, the upper layer system transmits a protocol control selection signal indicating the type of bus protocol to the multi-protocol system control apparatus 100.
At this time, the bus interface selecting module 110 sends the received downlink transmission signal to the corresponding bus protocol controller 121 in the protocol controller module 120 for processing according to the received protocol control selecting signal, and the physical layer interface selector 122 selects to send the downlink transmission signal processed by the corresponding bus protocol controller 121 in the protocol controller module 120 to the physical layer 500 for sending according to the received protocol control selecting signal. In this case, the corresponding bus protocol controller 121 in the protocol controller module 120 processes the downstream transmission signal in the same manner as the conventional bus protocol controller. Specifically, when the bus protocol controller module receives downlink data transmitted from the system bus, the received downlink data, the information such as commands, descriptions and the like are processed into a format and a sequence specified by the protocol according to the corresponding protocol requirements, and then converted into a physical layer interface time sequence to be transmitted to a physical layer. For example, the PCIE protocol controller converts the received information such as downstream data into TLP packets, stores the TLP packets therein, and sequentially sends the TLP packets to the physical layer interface.
Thereafter, when receiving the uplink transmission signal from the physical layer 500, the physical layer interface selector 122 transmits the uplink transmission signal from the physical layer 500 to the corresponding bus protocol controller 121 in the protocol controller module 120 for processing according to the received protocol control selection signal, and the bus interface selection module 110 transmits the uplink transmission signal processed by the corresponding bus protocol controller 121 to the upper system according to the received protocol control selection signal. Similarly, the corresponding bus protocol controller 121 in the protocol controller module 120 processes the uplink transmission signal accordingly, as in the case of the existing bus protocol controller.
Thus, the signal transmission interaction between the primary bus and the physical layer is completed.
According to the embodiment of the present invention, a plurality of bus protocols can be supported in the same multi-protocol system control apparatus 100, and the solution is simple and efficient. In addition, the configuration of the bus protocol can be selected through software implementation, so that the bus protocol is flexible and convenient.
The system bus is divided into a data bus for data transmission and a configuration bus for bus configuration, and the system also transmits a configuration signal through a configuration register.
Accordingly, according to an alternative embodiment of the present invention, as shown in fig. 2, the bus interface selection module 110 includes a data bus selection unit 111, and the data bus selection unit 111 is connected to the data bus and is connected to a plurality of bus protocol controllers 121121 (121-1, 121-2, …, 121-n) in the protocol controller module 120, respectively.
When signal transmission occurs on the data bus, the bus interface selection module 110 provides a protocol control selection signal from an upper layer of the system to the data bus selection unit 111, and the data bus selection unit 111 sends the received downlink data signal to a corresponding bus protocol controller 121 in the protocol controller module 120 for processing according to the received protocol control selection signal, and sends an uplink data signal processed by the corresponding bus protocol controller 121 to an upper layer system.
Furthermore, according to an alternative embodiment of the present invention, the bus interface selection module 110 further comprises a configuration bus selection unit 112, the configuration bus selection unit 112 being connected to the configuration bus or receiving the configuration register signals and being connected to a plurality of bus protocol controllers 121121 (121-1, 121-2, …, 121-n) in the protocol controller module, respectively.
When data transmission occurs on the configuration bus or a configuration register signal is received, a protocol control selection signal from an upper layer of the system is provided to the configuration bus selection unit 112, and the configuration bus selection unit 112 sends the received downlink configuration control signal to a corresponding bus protocol controller 121 in the protocol controller module 120 for processing according to the received protocol control selection signal, and sends an uplink configuration control signal processed by the corresponding bus protocol controller 121 to an upper layer system.
The multi-protocol system control device according to the embodiment of the present invention may support, for example, the existing serial bus protocol such as PCIe protocol, SATA protocol, rapidIO protocol, etc., but is not limited thereto. Accordingly, the protocol control select signal provided to the multi-protocol system control device may correspond to one of a PCIe protocol, SATA protocol, rapidIO protocol, SGMII protocol, etc.
When there are a plurality of system buses connected, the multi-protocol system control apparatus of the present invention may be extended to a plurality, each of the multi-protocol system control apparatus 100 corresponding to one system bus. These system buses may comprise at least one data bus and/or at least one configuration bus for supporting different bus types.
The embodiment of the invention also provides a multi-protocol system control method for the multi-protocol system control device suitable for the industrial application scene. The process of the multiprotocol system control method is described below with reference to fig. 3.
Referring to fig. 3, a protocol control selection signal transmitted from an upper layer system to a physical layer 500 is received to trigger processing of a downlink transmission signal at step S310.
In step S320, the bus interface selection module 110 switches the downlink transmission signal sent to the physical layer 500 through the system bus to the bus protocol controller 121 corresponding to the protocol control selection signal.
In step S330, the physical layer interface selector 122 sends the downlink transmission signal processed by the corresponding bus protocol controller 121 in the protocol controller module 120 to the physical layer 500 for transmission.
In step S340, the physical layer interface selector 122 sends the uplink transmission signal from the physical layer 500 to the corresponding bus protocol controller 121 in the protocol controller module 120 for processing.
In step S350, the bus interface selection module 110 sends the uplink transmission signal processed by the corresponding bus protocol controller 121 to the upper system.
As described above, the bus interface selection module may include a data bus selection unit 111, and the data bus selection unit 111 is connected to the data bus and connected to the plurality of bus protocol controllers 121 (121-1, 121-2, …, 121-n) in the protocol controller module, respectively.
Wherein, when receiving a protocol control selection signal sent from an upper layer system to the physical layer 500 (step S310), that is, when signal transmission occurs on a data bus, the protocol control selection signal from the upper layer of the system is provided to the data bus selection unit 111, and the data bus selection unit 111 sends the received downlink data signal to the corresponding bus protocol controller 121 in the protocol controller module for processing according to the received protocol control selection signal at step S320; in step S330, the physical layer interface selector 122 sends the downlink data signal processed by the corresponding bus protocol controller 121 in the protocol controller module 120 to the physical layer 500 for transmission; in step S340, the physical layer interface selector 122 sends the uplink data signal from the physical layer 500 to the corresponding bus protocol controller 121 in the protocol controller module 120 for processing; and, in step S350, the uplink data signal processed by the corresponding bus protocol controller 121 is transmitted to the upper system.
Similarly, the bus interface selection module may further include a configuration bus selection unit 112, the configuration bus selection unit 112 being connected to the configuration bus or receiving configuration register signals and being connected to a plurality of bus protocol controllers 121 (121-1, 121-2, …, 121-n) in the protocol controller module, respectively.
Wherein, when receiving a protocol control selection signal sent from the upper layer system to the physical layer 500 (step S310), that is, when data transmission occurs on the configuration bus or a configuration register signal is received, the protocol control selection signal from the upper layer of the system is provided to the configuration bus selection unit 112, and in step S320, the configuration bus selection unit 112 sends the received downlink configuration control signal to the corresponding bus protocol controller 121 in the protocol controller module for processing according to the received protocol control selection signal; in step S330, the physical layer interface selector 122 sends the downlink configuration control signal processed by the corresponding bus protocol controller 121 in the protocol controller module 120 to the physical layer 500 for transmission; in step S340, the physical layer interface selector 122 sends the uplink configuration control signal from the physical layer 500 to the corresponding bus protocol controller 121 in the protocol controller module 120 for processing; and, in step S350, the uplink configuration control signal processed by the corresponding bus protocol controller 121 is transmitted to the upper system.
The above embodiments are only for illustrating the embodiments of the present invention, but not for limiting the embodiments of the present invention, and various changes and modifications may be made by one skilled in the relevant art without departing from the spirit and scope of the embodiments of the present invention, so that all equivalent technical solutions also fall within the scope of the embodiments of the present invention, and the scope of the embodiments of the present invention should be defined by the claims.
Claims (10)
1. A multiprotocol system control device for a physical layer suitable for an industrial-level application scenario, comprising:
the system comprises a bus interface selection module and a protocol controller module, wherein the bus interface selection module is connected with a system bus, the protocol controller module comprises a plurality of bus protocol controllers connected with the bus interface selection module and a physical layer interface selector, the bus interface selection module is respectively connected with the plurality of bus protocol controllers in the protocol controller module, and the physical layer interface selector interacts with the physical layer and is respectively connected with the plurality of bus protocol controllers;
the bus interface selection module is used for receiving a downlink transmission signal sent to the physical layer through a system bus and receiving a protocol control selection signal sent to the physical layer from an upper layer system;
the physical layer interface selector is configured to receive a protocol control selection signal sent from an upper layer system to a physical layer,
wherein, for the upper layer system, the plurality of bus protocol controllers share the same interface address,
wherein the bus interface selection module is further configured to send the received downlink transmission signal to a corresponding bus protocol controller in the protocol controller module for processing according to the received protocol control selection signal, and send an uplink transmission signal processed by the corresponding bus protocol controller to an upper layer system,
the physical layer interface selector is further configured to select, according to the received protocol control selection signal, to send a downlink transmission signal processed by a corresponding bus protocol controller in the protocol controller module to a physical layer for sending, and send an uplink transmission signal from the physical layer to a corresponding bus protocol controller in the protocol controller module for processing.
2. The multi-protocol system control apparatus according to claim 1, wherein the bus interface selection module includes a data bus selection unit connected to a data bus and respectively connected to a plurality of bus protocol controllers in the protocol controller module.
3. The multi-protocol system control apparatus according to claim 2, wherein the bus interface selection module further comprises a configuration bus selection unit connected to a configuration bus or receiving a configuration register signal, and respectively connected to a plurality of bus protocol controllers in the protocol controller module.
4. A multiprotocol system control device as recited in claim 3, wherein the multiprotocol system control device is plural, each multiprotocol system control device corresponding to a system bus comprising at least one data bus and/or at least one configuration bus.
5. The multi-protocol system control apparatus according to any one of claims 1 to 4, wherein the physical layer interface selector interacts with the physical layer and the plurality of bus protocol controllers, respectively, using a PIPE protocol.
6. The multi-protocol system control apparatus according to any one of claims 1 to 4, wherein the protocol control selection signal corresponds to one of PCIe protocol, SATA protocol, and RapidIO protocol.
7. A multiprotocol system control method for a physical layer suitable for an industrial-level application scenario, the method being used for the multiprotocol system control device according to any one of claims 1 to 6, comprising:
when a protocol control selection signal transmitted from an upper layer system to a physical layer is received,
the bus interface selection module switches the downlink transmission signal sent to the physical layer through the system bus to the bus protocol controller corresponding to the protocol control selection signal, the physical layer interface selector sends the downlink transmission signal processed by the corresponding bus protocol controller in the protocol controller module to the physical layer for sending,
the physical layer interface selector sends the uplink transmission signal from the physical layer to the corresponding bus protocol controller in the protocol controller module for processing, and the bus interface selection module sends the uplink transmission signal processed by the corresponding bus protocol controller to an upper system.
8. The method according to claim 7, wherein the bus interface selection module includes a data bus selection unit connected to a data bus and respectively connected to a plurality of bus protocol controllers in the protocol controller module,
when signal transmission occurs on the data bus, a protocol control selection signal from an upper layer of the system is provided to the data bus selection unit, and the data bus selection unit sends the received downlink transmission signal to a corresponding bus protocol controller in a protocol controller module for processing according to the received protocol control selection signal, and sends an uplink transmission signal processed by the corresponding bus protocol controller to an upper layer system.
9. The control method according to claim 8, wherein the bus interface selection module further comprises a configuration bus selection unit connected to a configuration bus or receiving a configuration register signal and respectively connected to a plurality of bus protocol controllers in the protocol controller module,
when data transmission occurs on the configuration bus or a configuration register signal is received, a protocol control selection signal from an upper layer of the system is provided to the configuration bus selection unit, and the configuration bus selection unit sends a received downlink configuration control signal to a corresponding bus protocol controller in a protocol controller module for processing according to the received protocol control selection signal, and sends an uplink configuration control signal processed by the corresponding bus protocol controller to an upper layer system.
10. The method according to any one of claims 7 to 9, wherein the physical layer interface selector interacts with the physical layer and the plurality of bus protocol controllers using a PIPE protocol, respectively.
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| CN101246465A (en) * | 2007-05-18 | 2008-08-20 | 北京思比科微电子技术有限公司 | General serial bus chip |
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