WO2016141724A1

WO2016141724A1 - Real-time bus and implementation method therefor

Info

Publication number: WO2016141724A1
Application number: PCT/CN2015/093681
Authority: WO
Inventors: 吕建新
Original assignee: 烽火通信科技股份有限公司
Priority date: 2015-03-09
Filing date: 2015-11-03
Publication date: 2016-09-15
Also published as: CN104660476A

Abstract

Disclosed are a real-time bus and an implementation method therefor. The method comprises the following steps: an uplink bus is composed of a plurality of first buses, and the first buses are connected to a plurality of single boards and is connected to a common single board; a downlink bus is composed of a plurality of second buses having identical transmission rates and contents, the second buses one-to-one correspond to the first buses, and the second buses are connected to a plurality of single boards separately and are connected to the common single board; each single board outputs information within a corresponding timeslot and transmits the information to a data forwarding unit, via the uplink bus, for receiving, and other time periods are high in resistance; and the data forwarding unit collects the received information, forwards the information to a timeslot corresponding to each single board on the downlink bus, and forwards downlink data of all the single boards to the downlink bus, and each single board receives the downlink data within the corresponding timeslot. The present invention has the advantages of simple structure, low cost, strong real-time performance, large quantity of connected single boards and the like, decreases the quantity of interconnected wires of a backboard, reduces the costs of the backboard and a connector, and improves the reliability of a device. The inventor shall check it carefully.

Description

Real-time bus and implementation method thereof

Technical field

The present invention relates to the field of communications technologies, and in particular, to a real-time bus and an implementation method thereof.

Background technique

Some large-scale electronic devices in the communication field usually consist of multiple boards that are inserted into the backplane. The boards are interconnected through the backplane connection, especially in large-capacity optical transmission equipment. The number of boards is usually more than 30. It is very difficult to use one bus to communicate between all boards, especially for some information with low information and high real-time requirements.

There are many existing bus technologies, such as CAN (Controller Area Network) bus and I2C bus. These technologies have been widely used in industrial electronics, communication equipment, etc. However, there are complex implementation protocols and low real-time performance. The disadvantages of high cost of the backplane and the connector are not suitable for occasions where the amount of interconnection information is small and the real-time requirements are high. There are a large number of boards in a communication device. It is required to notify the in-position and alarm information in real time between boards. The point-to-point interconnection between boards is too much. It is obviously difficult to implement. It uses technologies such as CAN and I2C bus. Even the existing protocol is not suitable for communication between a large number of boards.

In summary, the existing bus technology has the following problems:

(1) The implementation of the protocol is complex;

(2) low real-time performance;

(3) The cost of the backboard and connectors is high.

Summary of the invention

The technical problem to be solved by the invention is to solve the complex and real-time implementation of the existing bus technology protocol. Low cost, high backplane and connector cost, to reduce the number and cost of signal interconnections between large numbers of boards in large devices, and to meet the real-time requirements of signals between boards.

In order to solve the above technical problem, the technical solution adopted by the present invention is to provide a real-time bus, including an uplink bus, a downlink bus, a system clock, and a data forwarding unit.

The uplink bus is composed of a plurality of first buses, each of which is connected to a plurality of boards, and each of the first buses determines a transmission rate and a time slot according to the number of boards connected thereto, and adopts Time-division multiplexing is used to transfer data of each board connected to the public board.

The downlink bus is composed of a plurality of second buses having the same transmission rate and content, and the second bus is in one-to-one correspondence with the first bus, and is respectively connected to the boards on the first bus; The time slot of the second bus is divided according to the number of all the boards;

The system clock is used for synchronizing and sampling data of the bus, and is composed of a frame positioning clock and a sampling clock. Each board uses a sampling clock to transmit and receive data. The time slot segments of different boards are positioned by a frame positioning clock.

The data forwarding unit is located on the public board, and receives the information sent by the board on the uplink bus, and the received information is summarized and forwarded to the corresponding time slot of each board on the downlink bus. on.

In the above-mentioned real-time bus, each of the first buses is connected with m-blocks, the rate of the first bus is 1/n sampling clock frequency, n is the total number of device boards/m; the second bus The rate is equal to the sampling clock frequency.

In the above real-time bus, the number of boards connected to each of the first buses is different, the rate of the first bus is 1/n sampling clock frequency, n is the total number of device boards / the connection on the first bus The number of boards; the rate of the second bus is equal to the sampling clock frequency.

In the real-time bus, each board outputs the information of the board in the corresponding time slot segment, and is transmitted to the data forwarding unit on the public board through each uplink bus, and the remaining period is high impedance; the data is The forwarding unit forwards the downlink data of all the boards to the downlink bus, and each board receives the corresponding downlink data in the time slot corresponding to the downlink bus.

The invention also provides a real-time bus implementation method, the implementation method comprising the following steps:

Step 201: The uplink bus is composed of a plurality of first buses, and the first bus is connected to a plurality of boards and connected to a common board;

Step 202: The downlink bus is composed of a plurality of second buses having the same transmission rate and content, and the second bus is in one-to-one correspondence with the first bus, and the second bus is respectively connected to a plurality of boards and The public board is connected;

Step 203: The boards output the information of the board in the corresponding time slot segments, and transmit the information to the data forwarding unit on the public board through the uplink bus, and the other periods are high-resistance;

Step 204: The data forwarding unit forwards the received information to the time slot segment corresponding to each board on the downlink bus, and forwards the downlink data of all the boards to the downlink bus. Each board receives corresponding downlink data in a time slot corresponding to the downlink bus.

In the above implementation method, the real-time bus synchronizes and samples the data through the system clock, and each board uses the sampling clock to perform data transmission and reception sampling, and the time slot segments of different boards are positioned by the frame positioning clock.

In the above implementation method, the data forwarding unit is located on the public board, receives information sent by the board on the uplink bus, and summarizes the received information and forwards the information to the downlink bus. The slot segment corresponding to the board.

In the above implementation method, the number of boards connected to each of the first buses is different, the rate of the first bus is 1/n sampling clock frequency, n is the total number of device boards / the connection on the first bus The number of boards; the rate of the second bus is equal to the sampling clock frequency.

In the above implementation method, each of the first buses determines a transmission rate and a time slot division according to the number of boards connected thereto, and transmits data of each board connected to the public board in a time division multiplexing manner; The time slot of each of the second buses is divided according to the number of all boards.

According to the invention, the bus is applied to complex electronic devices, in particular large-capacity communication devices. The information of all the boards can be interconnected. The utility model has the advantages of simple structure, simple protocol, low cost, strong real-time performance, and a large number of connected boards, which greatly simplifies the number of lines interconnected by the back board and reduces the back. Board and connector costs increase equipment reliability.

DRAWINGS

FIG. 1 is a structural diagram of a real-time bus according to an embodiment of the present invention;

FIG. 2 is a flowchart of a method for implementing a real-time bus according to an embodiment of the present invention.

detailed description

The present invention will be described in detail below with reference to the drawings and specific embodiments.

The embodiment of the invention provides a real-time bus, as shown in FIG. 1 , including an uplink bus, a downlink bus, a system clock, and a data forwarding unit.

The uplink bus is composed of a plurality of first buses, each of which is connected to a plurality of boards, and each of the first buses determines a transmission rate and a time slot according to the number of boards connected thereto, and adopts Time-division multiplexing transfers data from each board connected to the public board.

The downlink bus is composed of a plurality of second buses having the same transmission rate and content, and the second bus is in one-to-one correspondence with the first bus, and is respectively connected to the boards on the first bus; The time slots of the second bus are divided according to the number of all boards.

Each of the first buses is connected with an m-block, the rate of the first bus is 1/n sampling clock frequency, n is the total number of device boards/m; the rate of the second bus is equal to the sampling clock frequency. .

The number of the boards connected to the first bus is different, the rate of the first bus is 1/n sampling clock frequency, and n is the total number of device boards/the number of boards connected to the first bus; The rate of the second bus is equal to the sampling clock frequency.

The system clock is used for synchronizing and data sampling of the bus, and is composed of a frame positioning clock and a sampling clock. Each board uses a sampling clock for data transmission and reception sampling, and the time slot segments of different boards are positioned by a frame positioning clock.

Each board outputs the information of the board in the corresponding time slot segment, and is transmitted to the data forwarding unit on the public board through the uplink bus, and the remaining time period is high resistance; the data forwarding unit will all the boards. The downlink data is forwarded to the downlink bus, and each board receives corresponding downlink data in a time slot corresponding to the downlink bus.

The following is an example of an optical transmission device. The optical transmission device is generally composed of a control board, a cross-connect board, and a service processing board. The control board is a mandatory board in the device and is responsible for the management and control of the entire device. Configuration. Assume that there are 40 services, cross-boards and two control boards in the device. The real-time bus of this solution can be divided into four buses according to the single-board arrangement and the driving capability of the single-board bus interface, that is, four uplink buses and four. The root downlink bus, at this time n=4, hangs 10 boards on each bus. The bus structure is shown in Figure 1. If the sampling clock frequency of the device is 19.44MHz, the rate of each uplink bus is 1/4 sampling clock. The frequency, which is 4.86 Mb/s, is equal to the sampling clock frequency, which is 19.44 Mb/s. Each uplink bus is connected to 10 boards, that is, divided into 10 time slot segments, and the total number of boards connected to the downlink bus is 40, that is, divided into 40 time slot segments (excluding 2 control boards), or 42 time slot segments. (including 2 control panels). The optical transmission device generally has a system clock of 19.44 MHz and a frame positioning clock of 19.44 MHz, which can be used as a synchronous clock and a frame positioning clock of the real-time bus, and a frame positioning clock is used to locate a data slot.

According to the present invention, the bus is applied to a complex electronic device, in particular, a large-capacity communication device, which can realize interworking of information between all boards, has a simple structure, simple implementation protocol, low cost, strong real-time performance, and connection. The number of boards is large, which greatly simplifies the number of lines interconnected by the backplane, reduces the cost of the backplane and connectors, and improves the reliability of the equipment.

The embodiment of the invention further provides a real-time bus implementation method. As shown in FIG. 2, the implementation method includes the following steps:

Step 201: The uplink bus is composed of a plurality of first buses, and the first bus is separately connected. Connect a number of boards and connect them to the public board;

The present invention is not limited to the above-described preferred embodiments, and any one skilled in the art should be aware of the structural changes made in the light of the present invention. Any technical solutions having the same or similar to the present invention fall within the protection scope of the present invention.

Claims

A real-time bus includes an uplink bus, a downlink bus, a system clock, and a data forwarding unit, wherein

The uplink bus is composed of a plurality of first buses, each of which is connected to a plurality of boards, and each of the first buses determines a transmission rate and a time slot according to the number of boards connected thereto, and adopts Time-division multiplexing is used to transfer data of each board connected to the public board.

The downlink bus is composed of a plurality of second buses having the same transmission rate and content, and the second bus is in one-to-one correspondence with the first bus, and is respectively connected to the boards on the first bus; The time slot of the second bus is divided according to the number of all the boards;

The system clock is used for synchronizing and sampling data of the bus, and is composed of a frame positioning clock and a sampling clock. Each board uses a sampling clock to transmit and receive data. The time slot segments of different boards are positioned by a frame positioning clock.

The data forwarding unit is located on the public board, and receives the information sent by the board on the uplink bus, and the received information is summarized and forwarded to the corresponding time slot of each board on the downlink bus. on.
The real-time bus of claim 1, wherein each of the first buses is connected with an m-block, the rate of the first bus is 1/n sampling clock frequency, and n is the total number of device boards. /m; The rate of the second bus is equal to the sampling clock frequency.
The real-time bus according to claim 1, wherein the number of boards connected to each of the first buses is different, the rate of the first bus is 1/n sampling clock frequency, and n is the total number of boards of the device. / number of boards connected to the first bus; the rate of the second bus is equal to the sampling clock frequency.
The real time bus of claim 1 wherein:

Each board outputs the information of the board in the corresponding time slot segment, and is transmitted to the data forwarding unit on the public board through the uplink bus, and the remaining time period is high resistance; the data forwarding unit will all the boards. The downlink data is forwarded to the downlink bus, and each board is corresponding to the downlink bus. The slot receives the corresponding downlink data.
A method for realizing a real-time bus, characterized in that the implementation method comprises the following steps:

Step 201: The uplink bus is composed of a plurality of first buses, and the first bus is connected to a plurality of boards and connected to a common board;

Step 202: The downlink bus is composed of a plurality of second buses having the same transmission rate and content, and the second bus is in one-to-one correspondence with the first bus, and the second bus is respectively connected to a plurality of boards and The public board is connected;

Step 203: The boards output the information of the board in the corresponding time slot segments, and transmit the information to the data forwarding unit on the public board through the uplink bus, and the other periods are high-resistance;

Step 204: The data forwarding unit forwards the received information to the time slot segment corresponding to each board on the downlink bus, and forwards the downlink data of all the boards to the downlink bus. Each board receives corresponding downlink data in a time slot corresponding to the downlink bus.
The implementation method of claim 5, wherein the real-time bus synchronizes and samples the data through the system clock, and each board uses a sampling clock to perform data transmission and reception sampling, and the time slot segments of different boards are used. Frame positioning clock positioning.
The implementation method of claim 5, wherein the data forwarding unit is located on the public board, receives information sent by a board on the uplink bus, and forwards the received information together. Go to the slot segment corresponding to each board on the downlink bus.
The implementation method of claim 5, wherein the number of boards connected to each of the first buses is different, the rate of the first bus is 1/n sampling clock frequency, and n is the total number of boards of the device. / number of boards connected to the first bus; the rate of the second bus is equal to the sampling clock frequency.
The implementation method of claim 5, wherein each of the first buses determines a transmission rate and a time slot division according to the number of boards connected thereto, and uses the time division multiplexing manner to connect the boards connected thereto. The data is transmitted to the public board; the time slots of each of the second buses are based on The number of all boards is divided.