WO2021147005A1 - Appareil pour exécuter une resynchronisation et procédé de commutation de trajet - Google Patents

Appareil pour exécuter une resynchronisation et procédé de commutation de trajet Download PDF

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Publication number
WO2021147005A1
WO2021147005A1 PCT/CN2020/073835 CN2020073835W WO2021147005A1 WO 2021147005 A1 WO2021147005 A1 WO 2021147005A1 CN 2020073835 W CN2020073835 W CN 2020073835W WO 2021147005 A1 WO2021147005 A1 WO 2021147005A1
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WIPO (PCT)
Prior art keywords
path
data
controller
transmitter
receiver
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PCT/CN2020/073835
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English (en)
Chinese (zh)
Inventor
聂耳
马玉龙
郭健
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN202080094022.2A priority Critical patent/CN115004165A/zh
Priority to PCT/CN2020/073835 priority patent/WO2021147005A1/fr
Publication of WO2021147005A1 publication Critical patent/WO2021147005A1/fr

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    • G—PHYSICS
    • 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

Definitions

  • the embodiments of the present application relate to the field of computer technology, and in particular, to a path switching method and related devices.
  • PCIE Peripheral Component Interface Express
  • the controller After the receiver of the retimer receives the data, the controller will perform a series of complex processing on the data before forwarding, such as asynchronous and frequency offset removal processing first, then descrambling and data alignment processing, and then corresponding modification , And perform scrambling and encoding processing, and finally forward the data through the transmitter.
  • the controller in the retimer needs to perform complicated processing on the received data before forwarding, the data delay in the retimer is very large (usually up to 40ns), and certain business scenarios that are sensitive to delay will Have a greater impact.
  • the embodiments of the present application provide a device for performing retiming and a method for path switching, which can effectively reduce the delay to meet the requirements of different business scenarios.
  • the first aspect of the embodiments of the present application provides a device for performing retiming.
  • the device may be a retimer and includes: a first path, a second path, and a controller.
  • the controller is configured to switch the first path to the second path to transmit the second data based on the second path when it is determined that the transmission rate of the first data transmitted by the first path satisfies the preset first condition.
  • the delay of the second path is lower than the delay of the first path, the first data is path training data, and the second data is service data.
  • the second path has a lower delay than the first path.
  • the first path can be switched to the second path, that is, exit from the normal path and enter the low-delay path, based on the low-delay path Perform business data transmission. Therefore, through path switching, the transmission of service data based on the second path can effectively reduce the delay to meet the requirements of different service scenarios.
  • the first data is training ordered set TS2 data, which improves the flexibility and selectivity of the solution.
  • the preset first condition includes: the transmission rate is equal to the preset rate, which improves the solution Flexibility and selectivity.
  • the preset first condition further includes: TS2 data does not have a rate switching request, There is no request to enter the loopback state and no request to enter the prohibited state, which improves the flexibility and selectivity of the scheme.
  • the device further includes: a receiver for receiving the first data and the second data, a receiver for sending the first data and the second data, the first path is coupled to the receiver and the transmitter, and the first path is also connected To the controller, the second path is coupled to the receiver and transmitter;
  • the controller is also used to set the first path to the unavailable state and the second path to the available state when it is determined that the transmitter has completed the handover preparation, so as to transmit the second data based on the second path, which improves the solution Flexibility and selectivity.
  • the controller before switching the first path to the second path, the controller is also used for Modifying the data that the transmitter can send into pseudo-random binary sequence PRBS data improves the flexibility and selectivity of the scheme.
  • the controller is also used for Modifying the data that the transmitter can send to the data received by the receiver improves the flexibility and selectivity of the scheme.
  • a polarity reversal circuit is also provided between the receiver and the transmitter;
  • the polarity inversion circuit is used to invert the polarity of the second data, which improves the flexibility and selectivity of the solution.
  • the controller is further configured to determine that the first data transmitted by the second path meets the predetermined requirements.
  • the second path is switched to the first path to transmit the second data based on the first path, which improves the flexibility and selectivity of the solution.
  • the preset second condition includes: TS2 data has a request for rate switching, and has a balance Redo requests, requests with exit prohibited state, or requests with exit hot reset state, improve the flexibility and selectivity of the solution.
  • the controller is further configured to: The second path is set to an unavailable state, and the first path is set to an available state to transmit the second data based on the first path, which improves the flexibility and selectivity of the solution.
  • the controller before switching the second path to the first path, the controller also uses In order to modify the data that the transmitter can send into PRBS data, the flexibility and selectivity of the scheme are improved.
  • the controller after switching the second path to the first path, the controller further It is used to modify the data that the transmitter can send to the data received by the receiver, which improves the flexibility and selectivity of the scheme.
  • a second aspect of the embodiments of the present application provides a method for path switching, which is implemented by a device for performing retiming.
  • the device includes: a first path, a second path, and a controller; the method includes:
  • the controller switches the first path to the second path to transmit the second data based on the second path, wherein , The delay of the second path is lower than the delay of the first path, the first data is path training data, and the second data is service data.
  • the second path has a lower delay than the first path.
  • the first path can be switched to the second path, that is, exit from the normal path and enter the low-delay path, based on the low-delay path Perform business data transmission. Therefore, through path switching, the transmission of service data based on the second path can effectively reduce the delay to meet the requirements of different service scenarios.
  • the first data is training ordered set TS2 data, which improves the flexibility and selectivity of the solution.
  • the preset first condition includes: the transmission rate is equal to the preset rate, which improves the solution Flexibility and selectivity.
  • the preset first condition further includes: TS2 data does not have a request for rate switching, There is no request to enter the loopback state and no request to enter the prohibited state, which improves the flexibility and selectivity of the scheme.
  • the device further includes: a receiver for receiving the first data and the second data, a receiver for sending the first data and the second data, the first path is coupled to the receiver and the transmitter, and the first path is also connected To the controller, the second path is coupled to the receiver and transmitter;
  • Switching the first path to the second path by the controller to transmit the second data based on the second path includes:
  • the controller sets the first path to the unavailable state and sets the second path to the available state to transmit the second data based on the second path, which improves the solution Flexibility and selectivity.
  • the method further include:
  • the controller modifies the data that the transmitter can send into pseudo-random binary sequence PRBS data, which improves the flexibility and selectivity of the scheme.
  • the method further include:
  • the controller modifies the data that the transmitter can send to the data received by the receiver, which improves the flexibility and selectivity of the scheme.
  • a polarity reversal circuit is also provided between the receiver and the transmitter, and the method further includes:
  • the polarity of the second data transmitted by the second path is reversed, the polarity of the second data is reversed by the polarity reversal circuit, which improves the flexibility and selectivity of the solution.
  • the method further includes:
  • the controller determines that the first data transmitted by the second path meets the preset second condition, the controller switches the second path to the first path to transmit the second data based on the first path, which improves the solution Flexibility and selectivity.
  • the preset second condition includes: TS2 data has a request for rate switching, and has a balance Redo requests, requests with exit prohibited state, or requests with exit hot reset state, improve the flexibility and selectivity of the solution.
  • the second path is switched to the first path by the controller, so as to be based on the first path.
  • the path transmission of the second data includes:
  • the controller is also used to set the second path to an unavailable state and set the first path to an available state when it is determined that the transmitter has completed the handover preparation, so as to transmit the second data based on the first path, which improves the solution Flexibility and selectivity.
  • the controller before switching the second path to the first path, the controller also uses In order to modify the data that the transmitter can send into PRBS data, the flexibility and selectivity of the scheme are improved.
  • the controller after switching the second path to the first path, the controller further It is used to modify the data that the transmitter can send to the data received by the receiver, which improves the flexibility and selectivity of the scheme.
  • a third aspect of the embodiments of the present application provides a device for performing retiming, and the device includes:
  • Receiver used to receive data
  • Transmitter used to send data
  • the first path is coupled to the receiver and the transmitter, and the first path is also connected to the controller;
  • the second path which is coupled to the receiver and the transmitter, is used to transmit the data received by the receiver to the transmitter;
  • the controller is configured to switch the second path to the first path to transmit the second data based on the first path when it is determined that the first data transmitted by the second path meets the preset second condition, where the second path
  • the delay of is lower than the delay of the first path, the first data is path training data, and the second data is service data.
  • the first data is training ordered set TS2 data, which improves the flexibility and selectivity of the solution.
  • the preset second condition includes: TS2 data has a request for rate switching, and has a balance Redo requests, requests with exit prohibited state, or requests with exit hot reset state, improve the flexibility and selectivity of the solution.
  • the device further includes: a receiver for receiving the first data and the second data , A receiver for transmitting the first data and the second data, the first path is coupled to the receiver and the transmitter, the first path is also connected to the controller, and the second path is coupled to the receiver and the transmitter;
  • the controller is also used to set the second path to an unavailable state and set the first path to an available state when it is determined that the transmitter has completed the handover preparation, so as to transmit the second data based on the first path, which improves the solution Flexibility and selectivity.
  • the controller before switching the second path to the first path, the controller is also used for Modifying the data that the transmitter can send into PRBS data improves the flexibility and selectivity of the scheme.
  • the controller is also used to modify the data that the transmitter can send to the data received by the receiver, which improves the flexibility and selectivity of the scheme.
  • the fourth aspect of the present application also provides a method for path switching, which is implemented by a device for performing retiming.
  • the device includes: a first path, a second path, and a controller; the method includes:
  • the controller switches the second path to the first path to transmit the second data based on the first path, where the second path The delay of the path is lower than the delay of the first path, the first data is path training data, and the second data is service data.
  • the first data is training ordered set TS2 data, which improves the flexibility and selectivity of the solution.
  • the preset second condition includes: TS2 data has a request for rate switching, and has a balance Redo requests, requests with exit prohibited state, or requests with exit hot reset state, improve the flexibility and selectivity of the solution.
  • the device further includes: a receiver for receiving the first data and the second data , A receiver for transmitting the first data and the second data, the first path is coupled to the receiver and the transmitter, the first path is also connected to the controller, and the second path is coupled to the receiver and the transmitter;
  • Switching the second path to the first path by the controller to transmit the second data based on the first path includes:
  • the second path is set to the unavailable state by the controller, and the first path is set to the available state to transmit the second data based on the first path, which improves the solution Flexibility and selectivity.
  • the method in combination with the third implementation manner of the fourth aspect of the embodiments of the present application, in the fourth implementation manner of the fourth aspect of the embodiments of the present application, before the second path is switched to the first path by the controller, the method also includes:
  • the data that can be sent by the transmitter is modified into PRBS data through the controller, which improves the flexibility and selectivity of the scheme.
  • the second path is switched to the second path through the controller.
  • the method also includes:
  • the controller modifies the data that the transmitter can send to the data received by the receiver, which improves the flexibility and selectivity of the scheme.
  • the fifth aspect of the embodiments of the present application also provides a PCIE system, which includes:
  • the first PCIE device
  • the second PCIE device The second PCIE device
  • the apparatus for performing retiming as in any one of the first aspect and the third aspect which is coupled to the first PCIE device and the second PCIE device, so that two PCIE devices are provided between the first PCIE device and the second PCIE device. Data flow in the direction.
  • An embodiment of the present application provides a device for performing retiming and a method for path switching, where the device includes: a first path, a second path, and a controller, and the controller is used to determine the first path to transmit in the first path.
  • the first path is switched to the second path to transmit the second data based on the second path, where the delay of the second path is lower than the delay of the first path,
  • One data is path training data
  • the second data is business data.
  • the controller can switch the currently used first path to the second path to transmit the second data through the second path after judging that the transmission rate of the first data transmitted by the first path satisfies the preset first condition, Since the delay of the second path is lower than the delay of the first path, the transmission of service data based on the second path can effectively reduce the delay to meet the requirements of different service scenarios.
  • FIG. 1 is a schematic structural diagram of a PCIE system provided by an embodiment of the application.
  • FIG. 2 is a schematic structural diagram of a retimer provided by an embodiment of the application.
  • FIG. 3 is a schematic diagram of another structure of a retimer provided by an embodiment of the application.
  • FIG. 4 is a schematic diagram of another structure of a retimer provided by an embodiment of the application.
  • FIG. 5 is a schematic flowchart of a path switching method provided by an embodiment of the application.
  • FIG. 1 is a schematic structural diagram of the PCIE system provided by an embodiment of this application.
  • the PCIE system includes: a first PCIE device, a first PCIE device, and a second PCIE device.
  • Two PCIE equipment and a device for performing retiming where the first PCIE device and the second PCIE can be personal computers, servers, data centers, etc., and there is no specific limitation here, but the device for performing retiming can be To retimer, two PCIE devices can be coupled to one or more retimers (only one retimer is shown in Figure 1).
  • the retimer provides a link (path) for two PCIE devices, so that the two PCIE devices can communicate and realize information exchange.
  • FIG. 2 is a schematic structural diagram of the retimer provided by the embodiment of the application. Please refer to FIG. 2.
  • the retimer includes a receiver 201, a transmitter 202, and a controller 203.
  • the receiver 201 can start from the first PCIE
  • the device receives the data
  • the controller 203 can perform corresponding processing on the data received by the receiver 201
  • the transmitter 202 can send the processed data to the second PCIE device.
  • the retimer further includes: a first path 204 (normal path) and a second path 205 (low delay path), wherein the first path 204 is coupled to the receiver 201 and the transmitter 202, and the first path 204 Also connected to the controller 203.
  • the second path 205 is coupled to the receiver 201 and the transmitter 202.
  • the receiver 201 When two PCIE devices perform data transmission based on the first path 204, the receiver 201 first sends the data to the controller 203 for processing after receiving the data from the first PCIE device, and the transmitter 202 then transmits the processed data It is sent to the second PCIE device, so the delay of the first path 204 includes the delays of the receiver 201, the controller 203, and the transmitter 202. However, the second path 205 does not include the controller 203. When data is transmitted based on the second path 205, the data does not need to be processed by the controller 203.
  • the transmitter 202 can directly send data to the second PCIE device, so the delay of the second path 205 only includes the delays of the receiver 201 and the transmitter 202, that is, the second path 205 has a lower delay than the first path 204.
  • the first PCIE device is used as a device for sending data
  • the second PCIE device is used as a device for receiving data.
  • the second PCIE device can be used as a device for sending data
  • the first PCIE device Can be used as a device for receiving data.
  • the system when the PCIE system is in the normal working state (that is, the L0 state), if an error or a certain demand occurs in the path state (for example, the path state changes), the system can enter the recovery state (recovery state) from the L0 state , To retrain the path.
  • the recovery state recovery state
  • the retimer can switch between the first path 204 and the second path 205.
  • the path switching performed by the retimer includes two situations. One is to enter the low-delay path, that is, from the first path 204 to the second path 205, and the other is to exit the low-delay path, that is, from the second path 205. Entering the first path 204, the case of entering the low-delay path will be introduced first.
  • the path currently used by the PCIE system to transmit data is the first path 204.
  • the PCIE system can switch the path.
  • the PCIE system can transmit the first data (that is, path training data) through the first path to implement path retraining.
  • the controller 203 of the retimer switches the first path 204 to the second path 205 when it determines that the transmission rate of the first path 204 to transmit the first data satisfies the preset first condition.
  • the PCIE system is currently used for The data transmission path is changed to the second path 205, so the second data, that is, service data, can be transmitted based on the second path 205 in the subsequent stage.
  • the controller 203 When the controller 203 determines whether the transmission rate meets the preset first condition, that is, when it determines that the PCIE system meets the preset first condition for entering the second path 205, it may switch the first path 204 to the second path 205, to transmit the second data through the second path 205. Since the second path 205 does not include the controller 203, after the receiver 201 receives the data, the data does not need to be processed by the controller 203 and can be directly sent The relay 202 performs forwarding, which can effectively reduce the delay to meet the requirements of different business scenarios.
  • the first PCIE device and the second PCIE device can start to transmit data for path training, such as TS1 data, TS2 data, etc., based on the first path.
  • path training such as TS1 data, TS2 data, etc.
  • the TS2 data transmission stage is entered.
  • the first data transmitted by the first path 204 is TS2 data.
  • the controller 203 of the retimer will detect in real time whether the receiver 201 has received TS2 data.
  • the controller 203 determines that the receiver 201 has received TS2 data, it will obtain the current transmission rate of the PCIE system, which is the first A path 204 transmits the transmission rate of the first data. After acquiring the transmission rate, the controller 203 can determine whether the transmission rate satisfies the preset first condition to determine whether the second path 205 can be entered from the first path 204.
  • the controller 203 In order to enter the second path 205 from the first path 204, the controller 203 needs to determine whether the transmission rate of the first data transmitted by the first path 204 meets a preset first condition, which can be set according to actual needs.
  • the preset first condition includes: the transmission rate is equal to the preset rate (a rate set in advance).
  • the preset first condition further includes: TS2 data does not have a request for rate switching, does not have a request to enter a loopback state, and does not have a request to enter a prohibited state.
  • the controller 203 can analyze the TS2 data and the transmission rate.
  • controller 203 determines that the TS2 data does not have the request for rate switching, the request for entering the loopback state, and the request for entering the prohibited state, and the transmission rate is equal to the preset Rate, it is determined that the PCIE system satisfies the preset first condition for entering the second path 205.
  • the controller 203 can switch between the first path 204 and the second path 205 after determining that the PCIE system meets the preset first condition for entering the second path.
  • the controller 203 can first modify the data that the transmitter 202 can send to PRBS data. Because the type of data that the transmitter 202 can send has changed, the transmission of TS2 data is restricted. . After the controller 203 determines that the transmitter is ready to switch, the controller 203 sets the first path 204 to an unavailable state and sets the second path 205 to an available state to complete the connection between the first path 204 and the second path 205 Switch.
  • the controller 203 After entering the second path 205, the controller 203 then modifies the data that the transmitter 202 can send to the data received by the receiver 201, so no matter what type of data the receiver 201 receives (for example, the subsequent first PCIE device).
  • the data used for negotiation with the second PCIE device, and the service data transmitted between the first PCIE device and the second PCIE device, etc., can be transmitted through the second path 205.
  • the foregoing forward switching process will be further introduced with reference to FIG. 2. As shown in FIG.
  • the retimer also includes a data selector (multiplexer, MUX) 206, and the input end of the MUX 206 is coupled to the first
  • the output ends of the path 204 and the second path 205 are coupled to the transmitter 202.
  • the MUX 206 can be used for switching between the first path 204 and the second path 205.
  • the controller 203 may send a low-latency entry request to the transmitter 202, and modify the data that the transmitter 202 can send into PRBS data.
  • the transmitter 202 can prepare for switching based on the low-latency entry request (for example, switch its own state from the normal state to the low-latency state).
  • the preparation After the preparation is completed, it feeds back the preparation completion response to the controller 203.
  • the controller 203 receives the response, Then, the first path switching request is sent to the MUX 206, so that the MUX 206 sets the first path 204 to an unavailable state and sets the second path 205 to an available state.
  • the controller 203 receives the switching completion response sent by the MUX 206, it modifies the data that the transmitter 202 can send to the data received by the receiver 201 to transmit the data based on the second path 205.
  • the negotiation phase based on the PCIE protocol can be carried out.
  • the first PCIE device and the second PCIE device can negotiate through the second path 205
  • the PCIE protocol which will not be repeated here.
  • a polarity reversal circuit 207 is further provided in the second path 205.
  • the input terminal of the polarity reversal circuit 207 is coupled to the receiver 201,
  • the output terminal is coupled to the transmitter 202, and the polarity inversion circuit 207 can invert the polarity of the service data.
  • the service data sent by the transmitter 202 to the second PCIE device usually needs to carry a positive polarity. If the service data from the first PCIE device received by the receiver 201 carries a negative polarity, that is, the service data exists In the case of opposite polarity, polarity reversal is required to make the business data obtain the correct polarity.
  • the controller 203 can detect the polarity of the service data. If the controller 203 determines that the polarity of the service data is opposite, it will switch to the polarity inversion circuit. 207 sends a polarity reversal request. Based on the request, the polarity reversal circuit 207 can reverse the polarity of the service data from the receiver 201, and send the reversed service data to the transmitter 202, so that the transmitter 202 forwards the service data. The business data after the flip.
  • the service data can be transmitted when the system is in the LO state. If the PCIE system enters the recovery state again from the L0 state, the path retraining needs to be performed again. At this time, the path currently used by the PCIE system to transmit data is the second path 205, and the first PCIE device and the second PCIE device can communicate with each other. Based on the second path 205, data used for path training, such as TS1 data, TS2 data, and so on, are transmitted again. When the TS1 data transmission stage is completed between the first PCIE device and the second PCIE device, the TS2 data transmission stage is entered.
  • the retimer controller 203 will detect in real time whether the receiver 201 has received TS2 data. If the controller 203 determines that the receiver 201 has received the TS2 data, it determines whether the TS2 data (first data) transmitted by the second path meets the preset second condition to determine whether it can enter the first path 204 from the second path 205.
  • the controller 203 of the retimer determines that the TS2 data meets the preset second condition, the controller 203 can switch the second path 205 to the first path 204, so that the PCIE system uses the first path 204 after the path switching is completed.
  • the service data (second data) is transmitted as the currently used path, that is, the low-delay path enters the normal path.
  • the controller 203 In order to enter the first path 204 from the second path 205, the controller 203 needs to determine whether the TS2 data meets the preset second condition, and the preset second condition can be set according to actual needs.
  • the preset second condition includes: the TS2 data has a request for rate switching or a request for equalization redo or a request for exiting the prohibited state or a request for exiting the hot reset state.
  • the controller 203 can analyze the TS2 data. If the controller 203 determines that the TS2 data has a rate switching request or a balance redo request or a request to exit the prohibition state or a request to exit the hot reset state, it determines that the PCIE system meets the requirements of entering the first state.
  • the preset second condition of the path 204 The preset second condition of the path 204.
  • the controller 203 may switch between the first path 204 and the second path 205.
  • the controller 203 can first modify the data that the transmitter 202 can send to PRBS data. Because the type of data that the transmitter 202 can send has changed, the transmission of TS2 data is restricted. .
  • the controller 203 sets the second path 205 to an unavailable state and sets the first path 204 to an available state to complete the connection between the first path 204 and the second path 205 Switch.
  • the controller 203 modifies the data that the transmitter 202 can send to the data received by the receiver 201, so no matter what type of data the receiver 201 receives (for example, the subsequent first PCIE device).
  • the data used for negotiation with the second PCIE device, the service data transmitted between the first PCIE device and the second PCIE device, etc., can be transmitted through the first path 204.
  • the controller 203 may send a low-latency exit request to the transmitter 202, and modify the data that the transmitter 202 can send into PRBS data.
  • the transmitter 202 can prepare for switching based on the low-latency exit request (for example, switch its own state from the low-latency state to the normal state).
  • the controller 203 After completing the preparation, it will feed back the preparation completion response to the controller 203. After the controller 203 receives the response, Then, a second path switching request is issued to the MUX 206, so that the MUX 206 sets the second path 205 to an unavailable state and sets the first path 204 to an available state. After the controller 203 receives the switching completion response sent by the MUX 206, it modifies the data that the transmitter 202 can send to the data received by the receiver, so as to transmit the data based on the first path 204.
  • the negotiation phase based on the PCIE protocol can be carried out.
  • the first PCIE device and the second PCIE device can negotiate through the first path 204
  • the PCIE protocol which will not be repeated here.
  • the retimer includes a receiver 201, a transmitter 202, and a controller 203.
  • the controller 203 may include a first physical coding sub-layer (PCS) 2031, a link training and status machine (LTSSM) 2032, and a second PCS 2033, the first PCS 2031
  • PCS physical coding sub-layer
  • LTSSM link training and status machine
  • second PCS 2033 the first PCS 2031
  • the input end is coupled to the receiver 201
  • the output end of the first PCS 2031 is coupled to the LTSSM 2032
  • the input end of the second PCS 2033 is coupled to the LTSSM 2032
  • the output end of the second PCS 2033 is coupled to the transmitter 202.
  • the first PCS2031 is used to decode the data of the receiver 201
  • the LTSSM2032 is used to process the decoded data
  • the second PCS2033 then encodes the processed data, and then sends the encoded data to the transmitter 202.
  • the steps performed by the controller 203 in the foregoing embodiment are mainly performed by the LTSSM2032.
  • the LTSSM2032 can detect the type of data received by the receiver 201, and the LTSSM2032 can also determine whether the TS2 data and the current data transmission rate meet the preset requirements.
  • LTSSM2032 can also determine whether TS2 data meets the preset second condition, LTSSM2032 can also control MUX206 for path switching, LTSSM2032 can also modify the type of data that the transmitter 202 can send, and LTSSM2032 can also control the polarity reversal circuit 207 Perform polarity reversal on business data and so on.
  • the retimer includes a receiver 201, a transmitter 202, and a controller 203.
  • the controller 203 may include a first 2031, a plurality of LTSSM 2032 (for the convenience of drawing, only two are shown in Figure 4) and a second PCS 2033, the input of the first PCS 2031 is coupled to the receiver 201, the first PCS 2031 The output end is coupled to the first LTSSM 2032, the input end of the second PCS 2033 is coupled to the last LTSSM 2032, the output end of the second PCS 2033 is coupled to the transmitter 202, and multiple LTSSM 2032 are connected in series.
  • the first PCS2031 is used to decode the data of the receiver 201
  • multiple LTSSM2032 are used to process the decoded data
  • the second PCS2033 then encodes the processed data, and then sends the encoded data to Transmitter 202.
  • the steps executed by the controller 203 in the foregoing embodiment are mainly executed by multiple LTSSMs 2032 at the same time.
  • steps executed by multiple LTSSMs 2032 please refer to the relevant descriptions in the foregoing implementation manner, which will not be repeated here.
  • FIG. 5 is a schematic flowchart of the path switching method provided by the embodiment of the present application. Please refer to FIG. 5, the method is implemented by the retimer corresponding to any one of the embodiments in FIG. 2 to FIG. 4, and the method includes:
  • the controller When it is determined by the controller that the transmission rate of the first data transmitted by the first path meets the preset first condition, switch the first path to the second path by the controller to transmit the second data based on the second path , Where the delay of the second path is lower than the delay of the first path, the first data is path training data, and the second data is service data.
  • the first data is training ordered set TS2 data, which improves the flexibility and selectivity of the solution.
  • the preset first condition includes: the transmission rate is equal to the preset rate, which improves the flexibility and selectivity of the solution.
  • the preset first condition also includes: TS2 data does not have a request for rate switching, does not have a request to enter the loopback state, and does not have a request to enter the prohibited state, which improves the flexibility and flexibility of the solution.
  • TS2 data does not have a request for rate switching, does not have a request to enter the loopback state, and does not have a request to enter the prohibited state, which improves the flexibility and flexibility of the solution.
  • switching the first path to the second path by the controller to transmit the second data based on the second path includes:
  • the controller sets the first path to the unavailable state and sets the second path to the available state to transmit the second data based on the second path, which improves the solution Flexibility and selectivity.
  • the method before switching the first path to the second path through the controller, the method further includes:
  • the controller modifies the data that the transmitter can send into pseudo-random binary sequence PRBS data, which improves the flexibility and selectivity of the scheme.
  • the method further includes:
  • the controller modifies the data that the transmitter can send to the data received by the receiver, which improves the flexibility and selectivity of the scheme.
  • a polarity reversal circuit is further provided between the receiver and the transmitter, and the method further includes:
  • the polarity of the second data transmitted by the second path is reversed, the polarity of the second data is reversed by the polarity reversal circuit, which improves the flexibility and selectivity of the solution.
  • the method further includes:
  • the controller determines that the first data transmitted by the second path meets the preset second condition, the controller switches the second path to the first path to transmit the second data based on the first path, which improves the solution Flexibility and selectivity.
  • the preset second conditions include: TS2 data has a request for rate switching, a request for balanced redo, a request for exiting the prohibited state, or a request for exiting the warm reset state, which improves the solution’s performance Flexibility and selectivity.
  • switching the second path to the first path by the controller to transmit the second data based on the first path includes:
  • the controller is also used to set the second path to an unavailable state and set the first path to an available state when it is determined that the transmitter has completed the handover preparation, so as to transmit the second data based on the first path, which improves the solution Flexibility and selectivity.
  • the controller before switching the second path to the first path, is also used to modify the data that the transmitter can send into PRBS data, which improves the flexibility and selectivity of the solution.
  • the controller is also used to modify the data that the transmitter can send to the data received by the receiver, which improves the flexibility and flexibility of the solution.
  • the controller is also used to modify the data that the transmitter can send to the data received by the receiver, which improves the flexibility and flexibility of the solution.
  • the second path since the second path does not include a controller, the second path has a lower delay than the first path.
  • the first path can be switched to the second path, that is, exit from the normal path and enter the low-delay path to perform data transmission based on the low-delay path. Therefore, in the second path, after the receiver receives the data, the data can be directly forwarded through the transmitter without complicated processing by the controller, which can effectively reduce the delay to meet the requirements of different business scenarios.
  • the embodiment of the present application also provides a device for performing retiming, which includes:
  • Receiver used to receive data
  • Transmitter used to send data
  • the first path is coupled to the receiver and the transmitter, and the first path is also connected to the controller;
  • the second path which is coupled to the receiver and the transmitter, is used to transmit the data received by the receiver to the transmitter;
  • the controller is configured to switch the second path to the first path to transmit the second data based on the first path when it is determined that the first data transmitted by the second path meets the preset second condition, where the second path
  • the delay of is lower than the delay of the first path, the first data is path training data, and the second data is service data.
  • the first data is training ordered set TS2 data, which improves the flexibility and selectivity of the solution.
  • the preset second conditions include: TS2 data has a request for rate switching, a request for balanced redo, a request for exiting the prohibited state, or a request for exiting the warm reset state, which improves the solution’s performance Flexibility and selectivity.
  • the device further includes: a receiver for receiving the first data and the second data, a receiver for sending the first data and the second data, the first path is coupled to the receiver and the transmitter The first path is also connected to the controller, and the second path is coupled to the receiver and the transmitter;
  • the controller is also used to set the second path to an unavailable state and set the first path to an available state when it is determined that the transmitter has completed the handover preparation, so as to transmit the second data based on the first path, which improves the solution Flexibility and selectivity.
  • the controller before switching the second path to the first path, is also used to modify the data that the transmitter can send into PRBS data, which improves the flexibility and selectivity of the solution.
  • the controller is also used to modify the data that the transmitter can send to the data received by the receiver, which improves the flexibility and flexibility of the solution.
  • the controller is also used to modify the data that the transmitter can send to the data received by the receiver, which improves the flexibility and flexibility of the solution.
  • An embodiment of the present application also provides a method for path switching, which is implemented by a retimer corresponding to any one of the embodiments in FIG. 2 to FIG. 4, and the method includes:
  • the controller switches the second path to the first path to transmit the second data based on the first path, where the second path The delay of the path is lower than the delay of the first path, the first data is path training data, and the second data is service data.
  • the first data is training ordered set TS2 data, which improves the flexibility and selectivity of the solution.
  • the preset second conditions include: TS2 data has a request for rate switching, a request for balanced redo, a request for exiting the prohibited state, or a request for exiting the warm reset state, which improves the solution’s performance Flexibility and selectivity.
  • switching the second path to the first path by the controller to transmit the second data based on the first path includes:
  • the second path is set to the unavailable state by the controller, and the first path is set to the available state to transmit the second data based on the first path, which improves the solution Flexibility and selectivity.
  • the method before switching the second path to the first path by the controller, the method further includes:
  • the data that can be sent by the transmitter is modified into PRBS data through the controller, which improves the flexibility and selectivity of the scheme.
  • the method further includes:
  • the controller modifies the data that the transmitter can send to the data received by the receiver, which improves the flexibility and selectivity of the scheme.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention concerne, selon les modes de réalisation, un appareil pour exécuter une resynchronisation et un procédé de commutation de trajet, l'appareil comprenant : un premier trajet, un second trajet, et un dispositif de commande, le dispositif de commande étant utilisé pour commuter du premier trajet a seconde lorsqu'il est déterminé que le débit de transmission de premières données transmises sur le premier trajet satisfait une première condition prédéfinie, afin de transmettre des secondes données sur le second trajet ; la latence du second trajet est inférieure à la latence du premier trajet, les premières données sont des données d'apprentissage de trajet, et les secondes données sont des données de service. Dans le présent appareil, après avoir déterminé que le débit de transmission des premières données transmises sur le premier trajet satisfait une première condition prédéfinie, le dispositif de commande peut commuter le premier trajet actuellement utilisé vers le second trajet afin de transmettre des secondes données au moyen du second trajet ; lorsque la latence du second trajet est inférieure à la latence du premier trajet, la transmission de données de service sur le second trajet peut réduire efficacement la latence pour satisfaire les exigences de différents scénarios de service.
PCT/CN2020/073835 2020-01-22 2020-01-22 Appareil pour exécuter une resynchronisation et procédé de commutation de trajet WO2021147005A1 (fr)

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CN202080094022.2A CN115004165A (zh) 2020-01-22 2020-01-22 一种用于执行重定时的装置以及路径切换的方法
PCT/CN2020/073835 WO2021147005A1 (fr) 2020-01-22 2020-01-22 Appareil pour exécuter une resynchronisation et procédé de commutation de trajet

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