FF (foundation field) bus frame type recognizer

A type identification and bus frame technology, applied in the field of FF bus frame type identifier, can solve problems such as low performance ratio and excessive resource occupation

Active Publication Date: 2010-06-23
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional design, the control information extraction of the data link layer protocol data unit is realized by software, which takes up too many resources and has relatively low performance.

Method used

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  • FF (foundation field) bus frame type recognizer
  • FF (foundation field) bus frame type recognizer
  • FF (foundation field) bus frame type recognizer

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Embodiment Construction

[0034] The FF bus frame type identifier of the present invention is set in the FF field bus data link layer, such as Picture 10 As shown, the FF fieldbus model structure uses the three layers in the OSI model: physical layer, data link layer and application layer, with the third to sixth layers hidden. The physical layer and data link layer adopt IEC / ISA standards. The application layer has two sublayers: the fieldbus access sublayer FAS and the fieldbus information specification sublayer FMS, and integrate all functions from the data link to the FAS and FMS into a communication stack (Communication Stack).

[0035] Such as figure 1 As shown, the FOUNDATION Filedbus (FOUNDATION Filedbus, FF for short) bus frame type recognizer of the present invention is composed of three main modules, which are frame control word decoding and destination address receiving module, address matching module and conversion circuit, among which frame control word translation The code and destination...

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Abstract

The invention relates to a FF (foundation field) bus frame type recognizer arranged in a data link layer of a FF field bus. The FF bus frame type recognizer comprises a frame controlled word coding and target address receiving module, an address matching module, and a conversion circuit, wherein the frame controlled word coding and target address receiving module is used for generating frame control information, an address matching result and relevant parameters of a protocol data unit of the data link layer based on data signals received from the field bus and sending the frame control information, the address matching result and the relevant parameters of the protocol data unit of the data link layer to an upper processing unit of the data link layer; the address matching module is used for carrying out address matching processing on received address table data in the data link layer and an address data available indicating signal received through the conversion circuit and outputting to the upper processing unit of the data link layer; and the conversion circuit is used for carrying out timing adjustment on the address data available indicating signal and sending the adjusted address data available indicating signal to the address matching module. The invention can extract the type information of a DLPDU (data link protocol data unit), can identify the long address or the short address of the DLPDU, can extract the address information of the DLPDU, and can be implemented in various modes of FPGA (field programmable gate array), CPLD (complex programmable logic device), IP (internet protocol) and the like.

Description

Technical field [0001] The invention relates to a field bus technology, in particular to an FF bus frame type identifier capable of extracting frame control information of a data unit of an FF bus data link layer. Background technique [0002] The protocol control information generated on the FF fieldbus (FOUNDATION Filedbus, FF) data link layer realizes the control of various link transmission activities on the bus. In bus communication, link activity scheduling, data reception and transmission, activity detection and response, and link time synchronization between devices on the bus are all implemented through the data link layer. The data link layer protocol data unit (DLPDU) provides protocol control information for the data link. The protocol control information consists of three parts. The first part is frame control information, indicating the type, address length, priority, etc. of the data link layer protocol data unit; the second part is the data link address, includi...

Claims

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Application Information

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IPC IPC(8): H04L29/06
Inventor 杨志家段茂强崔书平谢闯董策王剑
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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