CN104052642B - A kind of communication system and communication means - Google Patents

Abstract

The invention discloses a communication system and a communication method. The communication system includes: a first processing board, a second processing board and a first Retimer chip, wherein: the first Retimer chip is connected to the controller of the first processing board, and the first processing board The board is connected to the second processing board through a serial small computer system interface SAS cable; the first processing board is used to send the link negotiation signal in optical mode, and the first Retimer chip is used to modify the link negotiation signal, and The modified link negotiation signal is transmitted to the second processing board through the SAS cable; the second processing board is configured to return a link response signal to the first processing board according to the modified link negotiation signal in optical mode. The system and method provided by the present invention are used to solve the technical problem in the prior art that with the increase of the signal transmission rate of the SAS link or the increase of the link length, the signal attenuation is relatively large during the transmission process.

Description

A communication system and communication method

technical field

The present invention relates to the communication field, in particular to a communication system and a communication method.

Background technique

A serial small computer system interface (Serial Attached Small Computer System Interface, SAS) link is mainly used for data transmission between memories.

At present, with the upgrading of products, the transmission technology of the SAS link has entered the third generation, and the corresponding SAS transmission protocol has also been upgraded to the SAS3.0 protocol. The signal transmission rate in the SAS3.0 protocol has been increased from 6G to 12G. , due to the increased requirements for optical cable access, the requirements for signal attenuation control in the SAS3.0 protocol are also stricter.

However, when the SAS link transmits signals, as the signal transmission rate increases, or as the link length increases, the attenuation of the signal also increases.

Contents of the invention

The present invention provides a communication system and a communication method, which are used to solve the technical problem that in the prior art, with the increase of the signal transmission rate of the SAS link, or the increase of the link length, the signal attenuation is relatively large during the transmission process .

In a first aspect, the present invention provides a communication system, including a first processing board, a second processing board, and a first Retimer chip, wherein: the first Retimer chip and the controller of the first processing board are connected through a circuit connected, the first processing board is connected to the second processing board through a serial small computer system interface SAS cable, and the first Retimer chip is a high-speed signal drive device with clock and data recovery functions; the second A processing board, configured to send a link negotiation signal when it is detected that the SAS cable is connected to the first processing board, wherein the working mode of the first processing board is an optical mode, and the link The negotiation signal is a signal sent by the first processing board in optical mode; the first Retimer chip is used to modify the link negotiation signal according to the information in the link negotiation signal, and convert the modified The link negotiation signal is transmitted to the second processing board through the SAS cable; the second processing board is used to transmit the link negotiation signal to the first processing board according to the link negotiation signal corrected by the first Retimer chip Returning a link response signal to establish a communication connection with the first processing board, wherein the working mode of the second processing board is an optical mode.

With reference to the first aspect, in a first possible implementation manner, the first Retimer chip is specifically configured to, according to the information in the link negotiation signal, perform the link negotiation signal according to a preset transmission rate. Amendment, and transmit the amended link negotiation signal to the second processing board through the SAS cable according to a preset transmission rate, wherein the preset transmission rate is the rate between the first processing board and the second processing board The maximum transmission rate supported by the communication link between the second processing boards.

With reference to the first aspect or the first possible implementation manner, in a second possible implementation manner, the communication system further includes: a second Retimer chip, and the control of the second Retimer chip and the second processing board The device is connected through a circuit, and is used to modify the modified link negotiation signal sent by the first Retimer chip again, and transmit the modified link negotiation signal to the control board of the second control board device; the second processing board is specifically configured to return the link response signal to the first processing board according to the link negotiation signal corrected by the second Retimer chip, so as to establish with the first processing board A communication connection, wherein the working mode of the second processing board is an optical mode.

Combining the first aspect or any one of the first possible implementation manner to the second possible implementation manner, in a third possible implementation manner, the SAS cable includes a SAS cable or a SAS optical cable, where: If the SAS cable is a SAS cable, the length of the SAS cable is not less than 0.5 meters; or if the SAS cable is a SAS optical cable, the length of the SAS optical cable is not less than 10 meters.

In a second aspect, the present invention provides a communication method, which is applied in a communication system, and the communication system includes a first processing board, a second processing board, and a first Retimer chip, wherein the first processing board and the The second processing board is connected through a serial small computer system interface SAS cable, and the first controller of the first processing board is connected with the first Retimer chip through a circuit, and the first Retimer chip has a clock and A high-speed signal drive device with a data recovery function, the method includes: the first processing board sends a link negotiation signal; wherein, the working mode of the first processing board is an optical mode, and the link negotiation signal is the The signal sent by the first processing board in optical mode; the first Retimer chip receives the link negotiation signal; the first Retimer chip performs the link negotiation signal on the link negotiation signal according to the information in the link negotiation signal Amendment; the first Retimer chip transmits the amended link negotiation signal to the second processing board through the SAS cable; the second processing board transmits the amended link negotiation signal according to the first Retimer chip The signal returns a link response signal to the first processing board to establish a communication connection with the first processing board, wherein the working mode of the second processing board is an optical mode.

With reference to the second aspect, in a first possible implementation manner, the modifying the link negotiation signal by the first Retimer chip according to information in the link negotiation signal includes: the first Retimer chip modifies the link negotiation signal according to the information in the link negotiation signal The information in the link negotiation signal is corrected according to the preset transmission rate; the first Retimer chip transmits the corrected link negotiation signal to the second link negotiation signal through the SAS cable The second processing board includes: the first Retimer chip transmits the revised link negotiation signal to the second processing board through the SAS cable according to a preset transmission rate, wherein the preset transmission rate is The maximum transmission rate supported by the communication link between the first processing board and the second processing board.

With reference to the second aspect or the first possible implementation manner, in a second possible implementation manner, the communication system further includes a second Retimer chip, and the second controller of the second processing board uses the second The Retimer chip is connected to the SAS cable, and the method further includes: the second Retimer chip corrects the link negotiation signal corrected by the first Retimer chip again, and the link negotiation signal corrected again The signal is transmitted to the controller of the second processing board; the second processing board returns a link response signal to the first processing board according to the link negotiation signal corrected by the first Retimer chip, including: the first The controller of the second processing board returns a link response signal to the first processing board according to the link negotiation signal corrected by the second Retimer chip.

Combining the second aspect or any one of the first possible implementation manner to the second possible implementation manner, in a third possible implementation manner, the SAS cable includes a SAS cable or a SAS optical cable, where: If the SAS cable is a SAS cable, the length of the SAS cable is not less than 0.5 meters; or if the SAS cable is a SAS optical cable, the length of the SAS optical cable is not less than 10 meters.

One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

In the embodiment of the present invention, when the first processing board and the second processing board are connected through a SAS cable, a high-speed signal drive device with clock and data recovery functions is connected between the first controller of the first processing board and the SAS cable Retimer chip, and set the working mode of the first processing board and the second processing board to optical mode, the Retimer chip is used to modify the link negotiation signal sent by the first controller, and send the modified link negotiation signal Send to the second processing board through the SAS cable. Therefore, through the correction of the signal by the Retimer chip, the attenuation of the signal during transmission through the SAS link is reduced.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a first structural diagram of a communication system in an embodiment of the present invention;

2A is a schematic diagram of an OOB signal in an electrical mode in an embodiment of the present invention;

2B is a schematic diagram of an OOB signal in an optical mode in an embodiment of the present invention;

FIG. 3A is a first schematic diagram of the application of the communication system in the embodiment of the present invention;

FIG. 3B is a second schematic diagram of the application of the communication system in the embodiment of the present invention;

Fig. 4 is the schematic diagram of Retimer chip transmission signal in the embodiment of the present invention;

FIG. 5 is a second structural diagram of the communication system in the embodiment of the present invention;

Fig. 6 is a flowchart of a communication method in an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments.

Embodiment one

This embodiment provides a communication system, please refer to FIG. 1, FIG. 1 is a structural diagram of the communication system in the embodiment of the present application, the communication system includes a first processing board 11, a second processing board 12 and a first Retimer chip 13 ,in:

The first Retimer chip 13 is connected to the controller 111 of the first processing board 11 through a circuit, and the first processing board 11 and the second processing board 12 are connected through a serial small computer system interface SAS cable 14 To connect, the first Retimer chip 13 is a high-speed signal drive device with clock and data recovery functions;

The first processing board 11 is configured to send a link negotiation signal when it is detected that the SAS cable 14 is connected to the first processing board 11, wherein the working mode of the first processing board 11 is In optical mode, the link negotiation signal is a signal sent by the first processing board 11 in optical mode;

The first Retimer chip 13 is configured to modify the link negotiation signal according to the information in the link negotiation signal, and transmit the corrected link negotiation signal to the a second processing board 12;

The second processing board 12 is configured to return a link response signal to the first processing board 11 according to the link negotiation signal corrected by the first Retimer chip 13, so as to establish communication with the first processing board 11 connection, wherein the working mode of the second processing board 12 is an optical mode.

In a specific implementation process, the controller 111 may be a controller chip or an application specific integrated circuit (Application Specific Integrated Circuits, ASIC), which is not limited in this embodiment.

In a specific implementation process, as shown in FIG. 1 , the controller 121 of the second processing board 12 is connected to the SAS cable 14 through a circuit, and the link response signal is a signal returned by the controller 121 of the second processing board 12 .

In the embodiment of the present application, the link negotiation signal sent by the first processing board 11 is an electrical signal, specifically an out-of-band signal (Out Of Band signal, OOB).

The link response signal returned by the second processing board 12 is also an electrical signal, specifically an OOB signal in the optical mode sent when the second processing board 12 works in the optical mode.

In this embodiment of the application, regardless of whether the SAS cable 14 is a SAS cable or a SAS optical cable, the first processing board 11 and the second processing board 12 are set to work in the optical mode, and the OOB signal in the optical mode is used for link negotiation The principle is as follows:

The Retimer chip must lock the phase of the signal through the transition edges in the received signal to recover the clock and data. If there is no continuous transition edge in the signal, the Retimer chip will lose lock and cannot work normally.

However, the SAS transmission protocol stipulates that before data transmission is performed through the SAS link, a link negotiation signal and a link response signal, that is, an OOB signal, need to be used to negotiate and establish a transmission link. In the prior art, when the SAS cable is a SAS cable, an OOB signal in electrical mode is often used by default to negotiate and establish a transmission link.

Please refer to FIG. 2A . FIG. 2A is a schematic diagram of an OOB signal in electrical mode. As shown in FIG. 2A , the OOB signal in electrical mode is a burst signal, which consists of a burst period of a certain length and an empty period of no signal. When the Retimer chip is applied to the SAS link, the empty period of the OOB signal in the electrical mode will remain at a stable level for a long time, and it cannot provide enough transition edges to ensure that the Retimer chip locks the phase of the signal, resulting in loss of lock.

In order to solve the problem of losing lock during the negotiation phase when the Retimer chip is applied to a SAS link, in this embodiment, no matter whether the SAS cable is a SAS cable or a SAS optical cable, the first processing board 11 and the second processing board 12 all work In the optical mode, and use the OOB signal of the optical mode to negotiate and establish the transmission link.

Please refer to FIG. 2B . FIG. 2B is a schematic diagram of an OOB signal in optical mode. As shown in FIG. 2B , the OOB signal in optical mode is a continuous jump signal and also consists of a burst period and an empty period of a certain length. However, the empty period and the burst period are data streams with different lengths, and the empty period also has transition edges, that is, the optical mode OOB signal can provide enough transition edges to ensure that the Retimer chip locks the phase of the signal, thereby ensuring that the Retimer chip Works fine in a SAS link.

In the embodiment of the present application, on the basis of ensuring that the first Retimer chip 13 works normally in the communication system including the SAS cable 14, the first Retimer chip 13 corrects the received signal.

Specifically, the correction of the received signal by the first Retimer chip 13 includes: correction of the link negotiation signal sent by the first processing board 11, and correction of the link response signal returned by the second processing board 12, as follows detail respectively.

The first situation: modifying the link negotiation signal sent by the first processing board 11 .

The controller 111 of the first processing board 11 sends a link negotiation signal to the first Retimer chip 13 in optical mode;

The first Retimer chip 13 locks the phase of the link negotiation signal based on sufficient and continuous transition signals provided by the link negotiation signal, so as to obtain the clock of the link negotiation signal, and then restores the outgoing link through the obtained clock. The data of the road negotiation signal;

The first Retimer chip 13 corrects the link negotiation signal based on the obtained clock and the recovered data, performs gain compensation on the corrected link negotiation signal according to a predetermined amplitude, and sends it to the second processing board through the SAS cable 14 12.

The second situation: modifying the link response signal returned by the second processing board 12 .

The second processing board 12 returns the link response signal to the first Retimer chip 13 through the SAS cable 14 according to the link negotiation signal corrected by the first Retimer chip 13 in the optical mode;

The first Retimer chip 13 locks the phase of the link response signal based on the sufficient and continuous transition signals provided by the link response signal to obtain the clock of the link response signal, and then restores the link out of the link through the obtained clock. The data of the road response signal;

The first Retimer chip 13 corrects the link response signal based on the acquired clock and the recovered data, and sends the corrected link response signal to the controller 111 of the first processing board 11 after gain compensation according to a predetermined amplitude.

In summary, the first Retimer chip 13 corrects the received signal with the recovered clock and data, and performs gain compensation on the signal with a predetermined amplitude before sending the corrected signal to offset the partial attenuation of the signal when it is transmitted through the SAS cable. Further, the attenuation of the signal during transmission through the SAS link is reduced.

Further, the first Retimer chip 13 revises the received signal with the recovered clock and data, which is equivalent to regenerating the received signal with the recovered clock and data, eliminating the need for the signal to be transmitted to the first Retimer chip 13 by the sending end. The signal jitter generated during the process reduces the signal jitter generated when the entire SAS link transmits the signal, so that the signal received by the signal receiving end is not distorted.

The following describes how the communication system provided by this embodiment is used to reduce the jitter and attenuation of the signal transmitted by the SAS link in conjunction with FIG. 3A and FIG. 3B:

Please refer to FIG. 3A , the main control board 301 is connected to the cascade board 302 through the SAS cable 14 , the main control board 301 is provided with a controller 111 , and the cascade board 302 is provided with a controller 121 .

When the controller 111 sends a signal to the controller 121 through the SAS cable 14, for the attenuation of the signal, it is assumed that the attenuation at which the signal is transmitted from the controller 111 of the main control board 301 to the interface between the SAS cable 14 and the main control board 301 is 18db, the attenuation of the controller 121 transmitted to the cascade board 302 through the SAS cable 14 is 16db, and the attenuation of the entire link is 34db, exceeding the attenuation requirements of the SAS3.0 transmission protocol.

For signal jitter, the signal jitter intensifies during the process of the signal being transmitted from the controller 111 of the main control board 301 to the interface between the SAS cable 14 and the main control board 301, but the signal is still an identifiable signal at this time. During the process of continuing to transmit to the controller 121 of the cascading board 302 through the SAS cable 14 , the jitter of the signal is further aggravated, causing the signal to be unrecognizable when reaching the controller 121 of the cascading board 302 .

As shown in FIG. 3B, when the communication system provided by this embodiment is used to forward data through the first Retimer chip 13, for signal attenuation, it is assumed that the signal is transmitted from the controller 111 of the main control board 301 to the SAS cable 14 and the main The attenuation at the interface of the control board 301 is 18db, the attenuation of the controller 121 transmitted to the cascade board 302 through the SAS cable 14 is 16db, and the first Retimer chip 13 corrects the signal and performs gain compensation according to the preset amplitude , providing a gain of 20db to the signal, the attenuation of the entire link is 14db, which meets the attenuation requirements of the SAS3.0 transmission protocol.

For signal jitter, the signal jitter is intensified during the process of signal transmission from the controller 111 of the main control board 301 to the first Retimer chip 13, but at this time the signal is still an identifiable signal, and the first Retimer chip 13 corrects the signal , to completely or partially eliminate the signal jitter caused by transmission, and send the restored signal with less jitter to the controller 121 of the cascade board 302, and then continue to transmit the signal to the controller 121 of the cascade board 302 through the SAS cable 14 During the process, although the jitter of the signal is intensified, the signal can still be recognized because there is no jitter generated when the accumulated signal is transmitted from the controller 111 of the main control board 301 to the first Retimer chip 13 .

Further, due to the provisions of the SAS transmission protocol, during link negotiation, OOB signals need to be sent back and forth multiple times between the first processing board 11 and the second processing board 12 for link negotiation, and the transmission rate of the OOB signal needs to be between different rates. and the time required for switching is very short. If the first Retimer chip 13 re-locks the phase of the transmitted signal every time the transmission rate of the SAS link is switched, the first Retimer chip 13 will re-lock the phase. If the time exceeds the transmission rate switching time stipulated in the SAS transmission protocol, the transmission will be interrupted.

In the embodiment of the present application, in order to increase the switching speed of the transmission rate of the SAS link, the first Retimer chip 13 is set, and according to the information in the link negotiation signal, the link negotiation signal is performed according to the preset transmission rate. Amended, and transmit the amended link negotiation signal to the second processing board 12 through the SAS cable 14 at a preset transmission rate, wherein the preset transmission rate is the first processing board 11 and the maximum transmission rate supported by the communication link between the second processing board 12.

By locking the transmission rate of the first Retimer chip 13 at the preset rate, time consumption caused by the first Retimer chip 13 re-locking the phase can be avoided.

In the specific implementation process, since the SAS3.0 transmission protocol stipulates that the transmission rate of the SAS link needs to be switched among 1.5Gbps, 3Gbps, 6Gbps, and 12Gbps, the preset frequency can be specifically set to 12Gbps.

Next, take the first processing board 11 to transmit the 01 pattern of 6Gbps rate to the second processing board 12 through the first Retimer chip 13 as an example, to illustrate the steps for the first Retimer chip 13 to modify the signal at the preset transmission rate:

The first processing board 11 sends the 01 pattern 401 of the 6Gbps rate as shown in Figure 4 to the first Retimer chip 13;

The first Retimer chip 13 uses the rate of 12Gbps to modify the 01 pattern of the 6Gbps rate, and corrects the 0011 pattern 402 of the 12Gbps rate;

The first Retimer chip 13 outputs the 0011 pattern 402 of 12Gbps rate to the second processing board 12;

The second processing board 12 receives the 0011 pattern 402 at a rate of 12Gbps at a rate of 6Gbps, and obtains the 01 pattern 401 at a rate of 6Gbps.

To sum up, the first Retimer chip 13 is set to repair the received signal at the maximum rate among the supported transmission frequencies, on the one hand, the switching speed of the transmission rate of the SAS link is improved, and on the other hand, the transmitted data is guaranteed to be undistorted On the basis of this, the transmission interruption caused by the long time for the high-speed signal drive device to re-lock the signal phase is prevented, and the technical effect of improving the transmission reliability of the SAS link is realized.

Preferably, the SAS cable 14 can be a SAS cable or a SAS optical cable. Considering that the longer the length of the SAS cable 14, the greater the signal transmission attenuation, it is more suitable to use the Retimer chip when the length of the SAS cable 14 is longer. To modify the link negotiation signal to reduce signal attenuation, that is, if the SAS cable 14 is a SAS cable, the length of the SAS cable is not less than 0.5 meters; or if the SAS cable 14 is a SAS optical cable, the The length of the SAS optical cable is not less than 10 meters.

In one case, the SAS cable 14 may be a SAS cable, and generally, the length of the SAS cable is not less than 0.5 meters. To ensure signal quality, the length of the SAS cable can be no greater than 6 meters. In another situation, the SAS cable 14 may be a SAS optical cable, and generally, the length of the SAS optical cable is not less than 10 meters. In order to ensure signal quality, the length of the SAS optical cable may not be greater than 100 meters.

Based on the same inventive concept, the present invention provides another embodiment, see Embodiment 2 for details.

Embodiment two:

A communication system is provided in Embodiment 2. Please refer to FIG. 5. FIG. 5 is a structural diagram of the communication system in Embodiment 2 of the present application. The processing board 12 and the first Retimer chip 13 also include:

The second Retimer chip 51, the second Retimer chip 51 is connected with the controller 121 of the second processing board 12 through a circuit, and is used for the link negotiation after the modification sent by the first Retimer chip 13 Correcting the signal again, and transmitting the revised link negotiation signal to the controller 121 of the second processing board 12;

The second processing board 12 is specifically configured to return the link response signal to the first processing board 11 according to the link negotiation signal corrected by the second Retimer chip 51, so as to communicate with the first processing board 11 11 Establish a communication connection, where the working mode of the second processing board 12 is an optical mode.

In the embodiment of the present application, the link response signal returned by the second processing board 12 to the first processing board 11 will also be corrected by the second Retimer chip 51 and the first Retimer chip 13 and then transmitted to the first processing board. 11. The detailed steps are:

The second processing board 12 returns the link response signal to the second Retimer chip 51 according to the link negotiation signal modified by the second Retimer chip 51 in the optical mode;

The second Retimer chip 51 corrects the received link response signal, and then sends the corrected link response signal to the first Retimer chip 13 through the SAS link;

The first Retimer chip 13 corrects the link response signal after the second Retimer chip 51 is corrected;

The first Retimer chip 13 sends the corrected link response signal to the first processing board 11 .

Specifically, setting two Retimer chips to correct the transmitted signal can further reduce signal attenuation and jitter during signal transmission, meeting the requirements for signal attenuation and signal jitter when the link wiring is too long.

Based on the same inventive concept, the present invention provides another embodiment, see Embodiment 3 for details.

Embodiment three:

In Embodiment 3, a communication method is provided, which is applied in a communication system, and the communication system includes a first processing board, a second processing board, and a first Retimer chip, wherein the first processing board and the second processing board The two processing boards are connected through a serial small computer system interface SAS cable, and the first controller of the first processing board is connected with the first Retimer chip through a circuit, and the first Retimer chip has clock and data High-speed signal-driven devices for recovery functions.

In this embodiment, the communication system may be the communication system provided in Embodiment 1 or Embodiment 2.

As shown in Figure 6, the method includes:

Step S601, the first processing board sends a link negotiation signal; wherein, the working mode of the first processing board is optical mode, and the link negotiation signal is a signal sent by the first processing board in optical mode ;

Step S602, the first Retimer chip receives the link negotiation signal;

Step S603, the first Retimer chip corrects the link negotiation signal according to the information in the link negotiation signal;

Step S604, the first Retimer chip transmits the revised link negotiation signal to the second processing board through the SAS cable;

Step S605, the second processing board returns a link response signal to the first processing board according to the link negotiation signal corrected by the first Retimer chip, so as to establish a communication connection with the first processing board, wherein, The working mode of the second processing board is light mode.

Preferably, the first Retimer chip correcting the link negotiation signal according to the information in the link negotiation signal includes:

The first Retimer chip corrects the link negotiation signal according to the preset transmission rate according to the information in the link negotiation signal;

The first Retimer chip transmitting the revised link negotiation signal to the second processing board through the SAS cable includes:

The first Retimer chip transmits the revised link negotiation signal to the second processing board through the SAS cable according to a preset transmission rate, wherein the preset transmission rate is the first processing board The maximum transmission rate supported by the communication link between the board and the second processing board.

Preferably, the communication system further includes a second Retimer chip, the second controller of the second processing board is connected to the SAS cable through the second Retimer chip, and the method further includes:

The second Retimer chip corrects the link negotiation signal corrected by the first Retimer chip again, and transmits the corrected link negotiation signal to the controller of the second processing board;

The second processing board returning a link response signal to the first processing board according to the link negotiation signal corrected by the first Retimer chip includes:

The controller of the second processing board returns a link response signal to the first processing board according to the link negotiation signal corrected by the second Retimer chip.

Preferably, the SAS cable includes a SAS cable or a SAS optical cable, wherein:

If the SAS cable is a SAS cable, the length of the SAS cable is not less than 0.5 meters; or

If the SAS cable is a SAS optical cable, the length of the SAS optical cable is not less than 10 meters.

It should be noted that the system and method provided by the embodiments of the present application can be used not only on multiple processing boards connected by SAS cables, but also on control boxes and cascade boxes connected by SAS cables. Disks may be included in the controller frame and the cascaded frame. It can be understood that, as long as the two communication nodes are connected through the SAS cable 14, the system and method provided by the embodiments of the present invention can be used.

The above-mentioned technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

In the embodiment of the present invention, when the first processing board and the second processing board are connected through a SAS cable, a high-speed signal drive device with clock and data recovery functions is connected between the first controller of the first processing board and the SAS cable Retimer chip, and set the working mode of the first processing board and the second processing board to optical mode, the Retimer chip is used to modify the link negotiation signal sent by the first controller, and send the modified link negotiation signal Send to the second processing board through the SAS cable. Therefore, through the correction of the signal by the Retimer chip, the attenuation of the signal during transmission through the SAS link is reduced.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (8)

1. A communication system, characterized in that, comprises a first processing board, a second processing board and a first Retimer chip, wherein: The first Retimer chip is connected to the controller of the first processing board through a circuit, the first processing board is connected to the second processing board through a serial small computer system interface SAS cable, and the second A Retimer chip is a high-speed signal drive device with clock and data recovery functions; The first processing board is configured to send a link negotiation signal when it is detected that the SAS cable is connected to the first processing board, wherein the working mode of the first processing board is an optical mode, and the The link negotiation signal is an electrical signal sent by the first processing board in optical mode, and the link negotiation signal is a continuous jump signal, which is used to provide a jump edge to enable the first Retimer chip to lock the The phase of the link negotiation signal; The first Retimer chip is configured to modify the link negotiation signal according to the information in the link negotiation signal, and transmit the corrected link negotiation signal to the second processing board; The second processing board is configured to return a link response signal to the first processing board according to the link negotiation signal corrected by the first Retimer chip, so as to establish a communication connection with the first processing board, wherein, The working mode of the second processing board is light mode. 2. The communication system according to claim 1, characterized in that: The first Retimer chip is specifically used to modify the link negotiation signal according to the preset transmission rate according to the information in the link negotiation signal, and pass the corrected link negotiation signal through the SAS The cable is transmitted to the second processing board according to a preset transmission rate, wherein the preset transmission rate is the maximum transmission rate supported by the communication link between the first processing board and the second processing board . 3. The communication system according to claim 1 or 2, further comprising: a second Retimer chip, the second Retimer chip is connected to the controller of the second processing board through a circuit, and is used to correct the corrected link negotiation signal sent by the first Retimer chip again, and transmit the revised link negotiation signal to the controller of the second processing board; The second processing board is specifically configured to return the link response signal to the first processing board according to the link negotiation signal corrected by the second Retimer chip, so as to establish a communication connection with the first processing board , wherein the working mode of the second processing board is light mode. 4. The communication system according to claim 1 or 2, wherein the SAS cable comprises a SAS cable or a SAS optical cable, wherein: If the SAS cable is a SAS cable, the length of the SAS cable is not less than 0.5 meters; or If the SAS cable is a SAS optical cable, the length of the SAS optical cable is not less than 10 meters. 5. A communication method, applied in a communication system, characterized in that the communication system includes a first processing board, a second processing board and a first Retimer chip, wherein the first processing board and the second processing board The processing board is connected through a serial small computer system interface SAS cable, the first controller of the first processing board is connected with the first Retimer chip through a circuit, and the first Retimer chip has clock and data recovery A high speed signal driving device of function, the method comprising: The first processing board sends a link negotiation signal; wherein, the working mode of the first processing board is optical mode, and the link negotiation signal is an electrical signal sent by the first processing board in optical mode, so The link negotiation signal is a continuous jump signal, which is used to provide a jump edge so that the first Retimer chip locks the phase of the link negotiation signal; The first Retimer chip receives the link negotiation signal; The first Retimer chip modifies the link negotiation signal according to the information in the link negotiation signal; The first Retimer chip transmits the revised link negotiation signal to the second processing board through the SAS cable; The second processing board returns a link response signal to the first processing board according to the link negotiation signal corrected by the first Retimer chip, so as to establish a communication connection with the first processing board, wherein the second processing board The working mode of the second processing board is light mode. 6. The communication method according to claim 5, wherein said first Retimer chip correcting said link negotiation signal according to information in said link negotiation signal comprises: The first Retimer chip corrects the link negotiation signal according to the preset transmission rate according to the information in the link negotiation signal; The first Retimer chip transmitting the revised link negotiation signal to the second processing board through the SAS cable includes: The first Retimer chip transmits the revised link negotiation signal to the second processing board through the SAS cable according to a preset transmission rate, wherein the preset transmission rate is the first processing board The maximum transmission rate supported by the communication link between the board and the second processing board. 7. The communication method according to claim 5 or 6, wherein the communication system also includes a second Retimer chip, and the second controller of the second processing board communicates with the second Retimer chip through the second Retimer chip. SAS cables are connected, and the method also includes: The second Retimer chip corrects the link negotiation signal corrected by the first Retimer chip again, and transmits the corrected link negotiation signal to the controller of the second processing board; The second processing board returning a link response signal to the first processing board according to the link negotiation signal corrected by the first Retimer chip includes: The controller of the second processing board returns a link response signal to the first processing board according to the link negotiation signal corrected by the second Retimer chip. 8. The communication method according to claim 5 or 6, wherein the SAS cable comprises a SAS cable or a SAS optical cable, wherein: If the SAS cable is a SAS cable, the length of the SAS cable is not less than 0.5 meters; or If the SAS cable is a SAS optical cable, the length of the SAS optical cable is not less than 10 meters.