WO2012071925A1

WO2012071925A1 - Single board communication system and communication method thereof

Info

Publication number: WO2012071925A1
Application number: PCT/CN2011/079666
Authority: WO
Inventors: 冯景; 王建伟
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-12-03
Filing date: 2011-09-15
Publication date: 2012-06-07
Also published as: CN102142986A

Abstract

Disclosed are a single board communication system and a communication method thereof. The system comprises a first single board, a second single board, a first programmable device located on the first single board, and a second programmable device located on the second single board, wherein the first programmable device is configured to receive a first signal from the first single board, convert the first signal into a first serial signal and send the first serial signal; the second programmable device is configured to receive the first serial signal from the first programmable device, convert the first serial signal into a second signal and send the second signal to the second single board. The present invention enables various signals to be sent with only one signal line, so as to reduce the number of signal lines and the cost of the single board communication system.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a single board communication system and a communication method thereof. BACKGROUND A communication device in an important position in a network is not allowed to have a single point of failure. These devices are generally equipped with two main control boards and multiple service boards. One main control board serves as the main control board, and the other main control unit. The board serves as the standby main control board, which is used to handle various communication services. In normal operation, the main control board serves as the core of control and management, and communicates with the external and service boards to complete the normal functions of each module in the system. The standby main control board serves as the backup of the main control board. When the main control board is faulty or the software and hardware are upgraded, the system automatically or manually pulls the main control board to perform the active/standby switchover. The standby main control board is upgraded to the main control board to ensure the normal operation of the original service. In order to ensure the synchronization of the data, configuration, and status of the standby main control board and the main control board, the boards in the device need to provide communication channels between the main control board and the standby main control board. A communication channel is also required between the main control board and the service board to ensure that the data, configuration, and status of the main control board are correctly delivered. Generally, high-speed serial communication is used between the main control board and the main control board, and between the main control board and the service board, such as Serial Gigabit Media Independent Interface (SGMII). At the same time, there are many low-speed signals between the main control board and the main control board, between the main control board and the service board or the service board and the service board, such as various lighting signals, alarm input signals, and alarm output signals. In the related art, the processing of these low-speed signals is to define these low-speed signals as different signals to communicate through the backplane connector signal lines or through the high-speed serial communication interface between the boards. However, due to the large number of low-speed signal lines between the boards, especially the main control board and each service board, these low-speed signal lines are required. The number of these low-speed signal lines on the main control board depends on the number of service boards supported by the device. Increase and increase substantially. Therefore, defining each low-speed signal into different signal lines will occupy many signal pins of the backplane connector, that is, the number of backplane connectors needs to be increased, which not only occupies the layout space of the board, but also increases the hardware cost of the device and the printed circuit board ( Printed Circuit Board, referred to as PCB). SUMMARY OF THE INVENTION A main object of the present invention is to provide a single-board communication system and a communication method thereof, so as to at least solve the above problem in the related art that a single-board transmission of various signals requires a corresponding signal line, so that the number of signal lines is greatly increased. In order to achieve the above object, according to an aspect of the present invention, a single board communication system is provided. The single board communication system according to the present invention includes a first board, a second board, a first programmable device on the first board, and a second programmable device on the second board, wherein the first The programming device is configured to receive the first signal from the first board, convert the first signal into the first serial signal, and transmit the first serial signal; the second programmable device is configured to receive the first programmable The first serial signal of the device converts the first serial signal into a second signal and transmits the second signal to the second board. a second programmable device, configured to receive a third signal from the second board, convert the third signal into a third serial signal, and transmit a third serial signal; the first programmable device is configured to receive from the first The third serial signal of the second programmable device converts the third serial signal into a fourth signal and sends a fourth signal to the first board. The single board communication system further includes a backplane; the second programmable device receives the first serial signal from the first programmable device via a first signal pin on the backplane; the first programmable device passes through the first on the backplane The second signal pin receives a third serial signal from the second programmable device. The first programmable device is coupled to the first signal pin of the backplane using a first serial signal line, and the second programmable device is coupled to the fourth signal pin of the backplane using a fourth serial signal line, wherein the first signal pin and The fourth signal pin is connected by a trace on the backplane; the first programmable device is connected to the second signal pin of the backplane using the second serial signal line, and the second programmable device is connected to the back using the third serial signal line The third signal pin of the board, wherein the second signal pin and the third signal pin are connected by a trace on the back board. The single board communication system further includes a reference ground line on the backplane, configured to provide a reference ground for the first serial signal and the third serial signal. The transmission rates of the first serial signal and the third serial signal are the same; the highest value of the transmission rate is determined according to the integrity of the first serial signal and the integrity of the third serial signal, and according to the characteristics of the backplane. In order to achieve the above object, according to another aspect of the present invention, a single board communication method is provided. The board communication method according to the present invention includes: the first programmable device transmits a sync header field to the second programmable device, wherein the sync header field is used to instruct to start transmitting the first serial signal; the first programmable device is Edit The device sends a control command field, wherein the control command field is used to indicate the role of the first serial signal; the first programmable device sends a data field to the second programmable device, wherein the data field is used to indicate the meaning of the first serial signal . Before the first programmable device sends the sync header field to the second programmable device, setting the first serial signal line and the fourth serial signal line for transmitting the first serial signal to a high level; the sync header field is a transition from a high level to a low level; after the first programmable device transmits a data field to the second programmable device, setting a first serial signal line and a fourth serial line for transmitting the first serial signal The signal line is high. In order to achieve the above object, according to another aspect of the present invention, a single board communication method is also provided. The board communication method according to the present invention includes the second programmable device determining that the received sync header field is correct, wherein the sync header field is for instructing to start transmitting the first serial signal; and the second programmable device determines the received control command The field is correct, wherein the control command field is used to indicate the role of the first serial signal; the second programmable device determines that the received data field is correct, wherein the data field is used to indicate the meaning of the first serial signal; Perform operations corresponding to control command fields and data fields. The corresponding operations described above include at least one of the following: indicating lighting, alarm input, and alarm output. The invention converts various signals into serial signals through a programmable device, and transmits the serial signals instead of transmitting the above various signals, thereby solving the related art, the corresponding signal lines are required for the single board to transmit various signals, thereby making the signals The problem of a large increase in the number of lines, in turn, requires only one signal line for the transmission of the above various signals, thereby saving signal lines and reducing the cost of the single board communication system. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the structure of a single board communication system according to an embodiment of the present invention; FIG. 2 is a block diagram showing the structure of a single board communication system according to a preferred embodiment of the present invention; FIG. 4 is a flowchart of a data transmitting method according to an embodiment of the present invention; FIG. 5 is a flowchart of a data transmitting method according to a preferred embodiment of the present invention; 6 is a flowchart of a data receiving method according to an embodiment of the present invention; and FIG. 7 is a flowchart of a data receiving method according to a preferred embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The embodiment of the invention provides a single board communication system. 1 is a structural block diagram of a single-board communication system according to an embodiment of the present invention. As shown in FIG. 1, a first single board 12, a second board 16, and a first programmable device 14 on the first board 12 are included. And a second programmable device 18 on the second board 16, wherein the first programmable device 14 is configured to receive the first signal from the first board 12 and convert the first signal into the first serial signal And transmitting a first serial signal; the second programmable device 18 is configured to receive the first serial signal from the first programmable device 14, convert the first serial signal into a second signal, and Board 16 transmits a second signal. In the related art, the first board 12 and the second board 16 need corresponding signal lines for transmitting various signals, so that the number of signal lines is greatly increased. In the embodiment of the present invention, various signals are converted into serial signals by the first programmable device 14 and the second programmable device 18, and the above various signals can be made by transmitting serial signals instead of transmitting the above various signals. The transmission only requires one signal line, which saves the signal line and reduces the cost of the single board communication system. The board communication system can be used for communication between the main control board and the main control board, the main control board and the service board, or between the service board and the service board to implement low-speed signal communication between the boards. Preferably, the second programmable device 18 is arranged to receive the third signal from the second board 16, convert the third signal into a third serial signal, and transmit the third serial signal; the first programmable device 14 And arranged to receive the third serial signal from the second programmable device 18, convert the third serial signal into a fourth signal, and send the fourth signal to the first single board 12. Preferably, the single board communication system can further include a backplane 19; the second programmable device 18 receives the first serial signal from the first programmable device 14 via a first signal pin located on the backplane 19; Device 14 receives a third serial signal from second programmable device 18 via a second signal pin located on backplane 19. Preferably, the first programmable device 14 is connected to the first signal pin of the backplane 19 using a first serial signal line, and the second programmable device 18 is connected to the fourth signal pin of the backplane 19 using a fourth serial signal line. Wherein the first signal pin and the fourth signal pin are connected by a trace on the backplane 19; the first programmable device 14 uses the second serial signal line Connected to the second signal pin of the backplane 19, the second programmable device 18 is connected to the third signal pin of the backplane 19 using a third serial signal line, wherein the second signal pin and the third signal pin are on the backplane 19. Connected by a trace. In the preferred embodiment, the first serial signal line and the fourth serial signal line may be one TX_DATA (TX_Data) signal line, and the second serial signal line and the third serial signal line may be one RX_DATA ( RX_Data) Signal lines, which can be used as low-speed signals to communicate with other boards. Preferably, the single board communication system further includes a reference ground line on the backplane 19, configured to provide a reference ground for the first serial signal and the third serial signal. 2 is a structural block diagram of a single-board communication system according to a preferred embodiment of the present invention. As shown in FIG. 2, the A-board and the B-board are respectively interconnected through a backplane, wherein the mutual interaction between the A-board and the B-board The connection includes the TX_DATA (TX_Data) and RX_DATA (RX_Data) signals and the ground reference of the backplane connector itself (backplane connector signal) for a total of three signals. Preferably, the transmission rates of the first serial signal and the third serial signal are the same; the highest value of the transmission rate is determined according to the integrity of the first signal and the integrity of the third signal, and according to the characteristics of the backplane 19. Preferably, the single-board communication system further includes a backplane connector, and is configured to send the signal of the first single board 12 and/or the signal of the second board 16 to the device back board 19, so that the boards can pass through the back board. 19 Interconnect the signals. 3 is a schematic diagram of a connection backplane connector according to a preferred embodiment of the present invention. As shown in FIG. 3, TX_DATA (TX_data) and RX_DATA (RX_DATA) signals are connected to the board through a backplane connector. On the programming device, various lighting signals, alarm input and output interfaces, and other low-speed signals are input and output from the programmable device, and the communication protocol is implemented on the programmable device, and the backplane connector is configured to signal the main control board or the service board. It is sent to the backplane of the device so that the boards interconnect the signals through the backplane. Compared with the prior art, the embodiment of the present invention implements communication of low-speed signals between the main control board and the main control board of the communication device, between the main control board and the service board, or between the service board and the service board. In the embodiment of the present invention, only two signal lines need to be added between two boards to implement all low-speed signal communication between the two boards, and only two signal pins of the backplane connector are needed, which does not occupy the backplane connection. A large number of signal pins. The embodiment of the invention provides a single board communication method. FIG. 4 is a flowchart of a data sending method according to an embodiment of the present invention. As shown in FIG. 4, the following steps S402 to S406 are included. Step S402, the first programmable device sends a synchronization header field to the second programmable device, where the synchronization header field is used to indicate to start transmitting the first serial signal. Step S404, the first programmable device sends a control command field to the second programmable device, wherein the control command field is used to indicate the role of the first serial signal. Step S406, the first programmable device sends a data field to the second programmable device, where the data field is used to indicate the meaning of the first serial signal. Preferably, before the first programmable device sends the sync header field to the second programmable device, setting the first serial signal line and the fourth serial signal line for transmitting the first serial signal to a high level; The header field is a transition from a high level to a low level; after the first programmable device transmits the data field to the second programmable device, setting a first serial signal line for transmitting the first serial signal and The four serial signal lines are high. FIG. 5 is a flowchart of a data transmitting method according to a preferred embodiment of the present invention. As shown in FIG. 5, the following steps S502 to S510 are included. In step S502, TX_DATA (TX_data) is always at a high level in the case of no communication. That is, before the communication, the programmable device sets the TX_DATA (TX_data) signal line to a high level, and the present invention can also adopt a low level in the case of no communication, as long as the two boards of the communication are identical. In step S504, when starting communication, the synchronization header field is sent first. The first data bit of the transmitted sync header field is required to be low, so that the low level of the first bit of the sync header field can be used as the start flag of the transmission, that is, the TX_DATA (TX_data) signal line synchronization header field Both start from a high to low transition. TX_DATA (TX_Data) When a signal line is transmitted, it is transmitted one by one data bit. The present invention can use the high bit of the byte to transmit first or the lower bit of the byte to be sent first, as long as the two boards of the communication are identical. Step S506, after the synchronization header field is sent, the control command field is sent. The data of the control command field is indicative of the role of the data field in step S508, i.e., indicating whether the data field in step S508 is for lighting control, alarm input or output, or other low speed signal control. Step S508, sending a data field. The content of the data field indicates whether the lighting is on or off, the presence or absence of the alarm input, the presence or absence of the alarm output, and the meaning of other low speed signals. In step S510, after the transmission is completed, TX_DATA (TX_data) is set to a high level. At this point, a processing flow for transmitting data is completed. If there are a plurality of control commands to be transmitted, step S502 to step S510 may be repeated. The embodiment of the invention further provides a single board communication method. FIG. 6 is a flowchart of a data receiving method according to an embodiment of the present invention. As shown in FIG. 6, the following steps S602 to S608 are included. Step S602, the second programmable device determines that the received synchronization header field is correct, wherein the synchronization header field is used to indicate to start transmitting the first serial signal. Step S604, the second programmable device determines that the received control command field is correct, wherein the control command field is used to indicate the role of the first serial signal. Step S606, the second programmable device determines that the received data field is correct, wherein the data field is used to indicate the meaning of the first serial signal. Step S608, the second programmable device performs an operation corresponding to the control command field and the data field. Preferably, the corresponding operation includes at least one of the following: indicating lighting, alarm input, and alarm output. FIG. 7 is a flowchart of a data receiving method according to a preferred embodiment of the present invention. As shown in FIG. 7, the following steps S702 to S714 are included. Step S702, the programmable device monitors whether the RX_DATA (RX_data) signal line has a high-to-low level transition, and if yes, proceeds to step S704, otherwise proceeds to step S702 to monitor the RX_DATA (RX_data) signal line. status. Step S704, receiving a synchronization header field, and storing the content of the lower synchronization header field for use in step S706. Step S706: Determine whether the synchronization header field received in step S704 is correct according to the synchronization header field confirmed before the two boards. If yes, go to step S708; otherwise, go to step S702. Step S708, receiving a control command field, and storing the content of the control command field. Step S710, it is confirmed whether the content of the control command field received in step S708 is a control command that has been defined before the two boards, and if yes, the process goes to step S712, otherwise, the process goes to step S702. Step S712, receiving a data field and storing the data field content. Step S714, according to the control command field received in step S708 and the data field received in step S712, control whether the lighting is turned on or off, the presence or absence of the alarm input, the presence or absence of the alarm output, and other low speed signals. At this point, a processing flow for receiving data is completed. It should be noted that the processing flow of FIG. 5 and FIG. 7 is implemented simultaneously in the programmable device, that is, the programmable device can simultaneously perform data transmission and reception. In summary, according to the above embodiments of the present invention, a single board communication system and a communication method thereof are provided. The programmable device converts various signals into serial signals, and transmits the serial signals instead of transmitting the above various signals, which solves the problem that the signal lines are required for the various signals transmitted by the single board in the related art, thereby making the number of signal lines The problem of a large increase, and thus the transmission of the above various signals requires only one signal line, thereby saving the signal line and reducing the cost of the single board communication system. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A single board communication system, comprising: a first board, a second board, a first programmable device on the first board, and a second programmable device on the second board, among them,

The first programmable device is configured to receive a first signal from the first board, convert the first signal into a first serial signal, and send the first serial signal;

The second programmable device is configured to receive the first serial signal from the first programmable device, convert the first serial signal into a second signal, and to the second board Sending the second signal.

2. The system of claim 1 wherein

The second programmable device is configured to receive a third signal from the second board, convert the third signal into a third serial signal, and send the third serial signal;

The first programmable device is configured to receive the third serial signal from the second programmable device, convert the third serial signal into a fourth signal, and to the first board Sending the fourth signal.

3. The system according to claim 2, wherein the single board communication system further comprises a backboard;

The second programmable device receives the first serial signal from the first programmable device via a first signal pin on the backplane;

The first programmable device receives the third serial signal from the second programmable device via a second signal pin located on the backplane.

4. The system of claim 3, wherein the first programmable device is connected to a first signal pin of the backplane using a first serial signal line, and the second programmable device uses a fourth string a row signal line is connected to the fourth signal pin of the backplane, wherein the first signal pin and the fourth signal pin are connected by a trace on the backplane;

The first programmable device is coupled to the second signal pin of the backplane using a second serial signal line, the second programmable device is coupled to the third signal of the backplane using a third serial signal line a needle, wherein the second signal pin and the third signal pin are connected by a trace on the backplane.

5. The system of claim 3, further comprising a reference ground on the backplane, configured to provide a reference ground for the first serial signal and the third serial signal.

6. The system according to claim 2, wherein a transmission rate of the first serial signal and the third serial signal is the same;

A highest value of the transmission rate is determined based on the integrity of the first serial signal and the integrity of the third serial signal, and based on characteristics of the backplane.

7. A single board communication method for a single board communication system according to claim 1, comprising:

The first programmable device transmits a sync header field to the second programmable device, wherein the sync header field is used to instruct to start transmitting the first serial signal;

The first programmable device transmits a control command field to the second programmable device, wherein the control command field is for indicating the role of the first serial signal;

The first programmable device transmits a data field to the second programmable device, wherein the data field is for indicating a meaning of the first serial signal.

8. The method according to claim 7, wherein: before the first programmable device transmits the synchronization header field to the second programmable device, setting a first portion for transmitting the first serial signal A serial signal line and a fourth serial signal line are at a high level;

The sync header field is a transition from a high level to a low level;

After the first programmable device transmits the data field to the second programmable device, setting the first serial signal line and the fourth serial for transmitting the first serial signal The signal line is high.

A single board communication method for the single board communication system according to claim 1, comprising:

The second programmable device determines that the received sync header field is correct, wherein the sync header field is used to indicate to start transmitting the first serial signal;

The second programmable device determines that the received control command field is correct, wherein the control command field is used to indicate the role of the first serial signal;

Determining, by the second programmable device, that the received data field is correct, wherein the data field is used to indicate a meaning of the first serial signal; The second programmable device performs an operation corresponding to the control command field and the data field.

The method of claim 9, wherein the corresponding operation comprises at least the following

Indicates lighting, alarm input, and alarm output.