Method for realizing PROFIBUS master station communication protocol based on FPGA (Field Programmable Gate Array) technology
A communication protocol and master station technology, applied in the direction of digital transmission system, electrical components, error prevention, etc., can solve the problems of non-disclosure of special chip technology, waste of bus time, failure to achieve transmission rate, etc., to improve bus communication rate and save Effect of bus time and load reduction
Active Publication Date: 2012-11-07
BEIJING D&S FIELDBUS TECH
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Problems solved by technology
[0005] Using the first solution, the technical requirements in the standard can be fully met, but the dedicated chip is limited by technology non-disclosure and patent protection, and there is a great risk in relying on competitors' chip supply in market competition
[0006] Use the second scheme to realize the PROFIBUS-DP master station communication protocol. Since the communication rate is limited by the working frequency of the micro control unit (MCU), the maximum transmission rate is 1.5Mbit / s. The content of the text must be received and parsed, which wastes bus time and cannot process the data stream quickly, so the maximum transmission rate of 12Mbit / S cannot be achieved.
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[0038] Please refer to figure 1 , in the present invention, master station hardware mainly comprises field programmable gate array FPGA chip and microcontroller unit MCU, wherein the main signal terminal that field programmable gate array FPGA chip uses is:
[0039] Serial reception RXD, serial transmission TXD, request to send RTS, low address line ADD[7:0], high address line ADD[15:8], data line DATA[7:0] and interrupt request RE_OK.
[0040] The main signal terminals used by the MCU are: read signal / RD, write signal / WR, address low allow ALE,
[0041] Address data multiplexing line AD[7:0] and high address line A[15:8], initialization completion signal Init_ok and sending request signal SEND_REQ.
[0042] The serial port differential signal lines A and B of the IL485 chip are connected to the slave station.
[0043] This design selects the field programmable gate array FPGA of Altera's cyclone series in the United States. The external 485 network sends the signal to th...
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The invention relates to a method for realizing PROFIBUS master station communication protocol based on an FPGA (Field Programmable Gate Array)technology. In the method, firstly, a field programmable gate array (FPGA) waits for a micro control unit to send the master station information; secondly, the micro control unit sends the master station information to the FPGA; thirdly, the FPGA starts the bus message monitoring; fourthly, the FPGA receives and analyzes the message; fifthly, the micro control unit determines the message to be sent according to the field bus communication standard; sixthly, the FPGA sends the messages by package; and seventhly, the FPGA turns from a message sending state into a message receiving state; and then, the method returns to the step 4. The method realizeshigh-speed communication between a PROFIBUS master station and a PROFIBUS slave station by using the FPGA technology and increases the communication rate up to 12 Mbit / s.
Description
technical field [0001] The invention relates to a method for realizing the communication protocol of the PROFIBUS master station of the industrial field bus through the Field Programmable Gate Array FPGA without using the special-purpose PROFIBUS master station protocol chip (ASPC2) of Siemens. The method can be applied to the design of the PROFIBUS master station to realize the communication functions of the cyclic communication DPV0 and the non-cyclic communication DPV1 of the PROFIBUS. Background technique [0002] At present, there are two options for the development of the PROFIBUS master station: one method is to use the solution of the micro control unit (MCU) + Siemens' special master station protocol chip (ASPC2), and its protocol has been solidified in the special chip ( Among ASPC2). [0003] Another method is to use a micro control unit (MCU) + software solution, using software programming to realize the fieldbus international standard PROFIBUS-DP master station...
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IPC IPC(8): H04L29/06H04L12/56H04L1/00H04L12/931
Inventor 李文娟崔慧娟
Owner BEIJING D&S FIELDBUS TECH