CN105974221A

CN105974221A - Universal adapter for multi-channel bus interface module testing

Info

Publication number: CN105974221A
Application number: CN201610265554.3A
Authority: CN
Inventors: 陆乐; 沈立军
Original assignee: China Aeronautical Radio Electronics Research Institute
Current assignee: China Aeronautical Radio Electronics Research Institute
Priority date: 2016-04-26
Filing date: 2016-04-26
Publication date: 2016-09-28

Abstract

The invention discloses a universal adapter for multi-channel bus interface module testing, comprising a CPU module and a signal conversion module. The signal conversion module is used for connecting a tested multi-channel GJB289A bus interface module and the CPU module. The CPU module is used for providing incentives for the tested multi-channel GJB289A bus interface module via a parallel bus, so the tested multi-channel GJB289A bus interface module outputs fixed data or signal waveform which is analyzed by bus analysis equipment. Through the universal adapter, the mode of product test can be changed from function test for a line replaceable unit to performance test for a shop replaceable unit and signals. Whether a tested module satisfies a GJB289A bus protocol can be detected, and the electrical characteristics of signals output by the tested module can be tested with the help of universal bus analysis equipment. The demand for module debugging in the scientific research phase and product detection in the batch production phase is satisfied.

Description

A kind of universal adapter for the test of multiple bus interface module

Technical field

The invention belongs to Avionic Products technical field of measurement and test.

Background technology

In Military Avionics, GJB289A bus is with its preferable real-time, rational mistake Control measure and higher bus efficiency and be used widely, the most various types of multichannels GJB289A are total Line Interface Module has use in various degree in all kinds of airplane avionics system.Module research and development, Produce and during troubleshooting, it need to be debugged, check, the fullest to verify its input, output interface The requirement of foot GJB289A-1997 standard.It is thus desirable to provide the simulation testing device of a kind of simple general use, give Multiple bus interface module provides suitable excitation, running environment on its machine of comprehensive simulation so that it is can be the most defeated Enter or export GJB289A bus signals, recycle special bus occur and signal is tested by analytical equipment, Analyze.

Summary of the invention

The purpose of the present invention, it is simply that provide general to different types of multichannel GJB289A bus interface module Emulation platform, normal operation circumstances on its machine of comprehensive simulated so that it is can normally receive and send GJB289A bus Data, to meet module scientific research debugging and the demand of batch production inspection.

The goal of the invention of the present invention is achieved through the following technical solutions:

A kind of universal adapter for the test of multiple bus interface module, comprises CPU module 1 and signal turns Die change block 2, it is characterised in that:

Described signal conversion module 2 is used for connecting tested multichannel GJB289A bus interface module 3 and CPU mould Block 1；

Described CPU module 1 is for providing sharp by parallel bus to tested multichannel GJB289A bus interface module 3 Encourage, make tested multichannel GJB289A bus interface module export fixing data or signal waveform, for bus analysis Device analysis.

Preferably, described signal conversion module comprises and the pairing of tested multichannel GJB289A bus interface module Signal plug and the fastening connector being connected with CPU module.

Preferably, described CPU module include processor, FLASH, SRAM, FPGA, electrical level transferring chip, RS232 interface chip, processor respectively with FLASH, SRAM, FPGA, electrical level transferring chip, RS232 interface Chip connects, and FPGA is also connected with electrical level transferring chip, under the control of a processor to tested multichannel GJB289A Bus interface module (3) provides excitation.

Preferably, described CPU module is according to the parallel bus form of tested multichannel GJB289A bus interface module Use ARM, PowerPC or PC104+ module.

The present invention by universal adapter can by the test mode of multichannel GJB289A bus interface module by towards The functional test of LRU is changed into the performance test towards internal field replaceable units and signal-oriented, There is provided excitation by universal adapter to multichannel GJB289A bus interface module, make multichannel GJB289A bus connect Mouth die block exports fixing data or signal waveform, for bus analysis device analysis.It is possible not only to multichannel Whether GJB289A bus interface module meets GJB289A bus protocol is detected, also can be by general total The electrical characteristic of multichannel GJB289A bus interface module output signal is tested by line analysis equipment, meets The debugging of scientific research stage module and the demand of batch product work-in-process detection, improve product test, maintainability, Alleviate the burden of attendant, improve product quality.

Accompanying drawing explanation

Fig. 1 is the structural representation of the present invention；

Fig. 2 is the theory diagram of the present invention；

Fig. 3 is the schematic flow sheet of the present invention.

Detailed description of the invention

The structure of a kind of universal adapter for the test of multiple bus interface module of the present invention is as it is shown in figure 1, former Reason block diagram is as in figure 2 it is shown, operation principle is as follows:

(1) due to work time tested multichannel GJB289A bus interface module may need repeatedly to plug；With Time universal adapter and tested module between have more interconnection of signals, from the standpoint of maintainability and versatility, Use CPU module+signal converting module two plate independent design, use drawing-aid device to help tested multichannel simultaneously GJB289A bus interface module plugs.It is close to be installed with for inserting tested many under the upper cover plate of universal adapter The signal converting module of road GJB289A bus interface module, signal converting module multichannel installed above and tested The signal plug of GJB289A bus interface module pairing.Signal converting module has been responsible for and tested multichannel The physical connection of GJB289A bus interface module, uses fastening to patch between CPU module and signal converting module Part connects, to ensure the reliability of interconnection of signals.

(2) CPU module includes processor, FLASH, SRAM, FPGA, electrical level transferring chip, RS232 Interface chip, processor is respectively with FLASH, SRAM, FPGA, electrical level transferring chip, RS232 interface chip even Connecing, FPGA is also connected with electrical level transferring chip, connects to tested multichannel GJB289A bus under the control of a processor Mouth die block 3 provides excitation.CPU module is according to the parallel bus form of tested multichannel GJB289A bus interface module The difference of (self-defined, PCI, VME etc.), can use the various ways such as ARM, PowerPC, PC104+ to set Meter, is connected with tested module by signal converting module, has substantially met in avionics system various conventional The test request of the GJB289A bus interface module of type.

(3), after universal adapter powers on, the embedded software of CPU module can timing be retrieved total by RS232 The external testing that line interface sends over instructs and resolves test instruction, then leads to if valid instruction Cross signal conversion module to carry out after signal converting the dual-port on tested multichannel GJB289A bus interface module RAM performs read-write operation, read, comparison CPU module receive GJB289A bus data or by specify lattice Formula sends data and carries out processing, analyzing for bus analysis equipment.Software flow is as shown in Figure 3.

(4) multichannel GJB289A bus interface module typically has three kinds of duties, bus control unit (BC), Remote terminal (RT), bus monitor (BM).During test, CPU module accesses multichannel by parallel bus Two-port RAM on GJB289A bus interface module, in designated address space (the information control of two-port RAM District) interior writing commands word, multichannel GJB289A bus interface module enters assigned work state after reading command word. Be both needed under all working state the data receiver to the two-port RAM on multichannel GJB289A bus interface module or Send district and perform correct read-write operation, when being operated in bus control unit (BC) pattern, also need multichannel The RT management table of GJB289A bus interface module, command block table configure, and load RT crosstab and pointer Table, is managed the RT related in system, makes the multichannel GJB289A bus interface module can be correctly in bus Arbitrary remote terminal (RT) carry out data transmit-receive control.RT is managed actually total to GJB289A Line Interface Module configures so that it is can normally be operated under BC state, (lives the RT related in bus The RT jumped) it is managed, RT management table includes the status information of each RT, and points to RT crosstab, and RT hands over Fork table includes that the address of the order relevant to each RT, RT management table, RT crosstab are all to be write by CPU module The designated address space of the two-port RAM on GJB289A bus interface module realizes.

(5) test device emulation sends test data to multichannel GJB289A bus interface module, multichannel The test data received are placed in the data receiver district of two-port RAM by GJB289A bus interface module, CPU Module may have access to this region and reads data, and the test data sent with test equipment are compared, and will compare Result is sent to test equipment by RS232 interface, completes a closed loop.When sending out data, by always Line analysis equipment can not only check the correctness of its output data, moreover it is possible to the electric spy to GJB289A bus signals Property include peak-to-peak value, rise and fall along, cross the performance such as punching, bit rate, bit rate degree of stability, the bit error rate and refer to Mark detects, to verify whether it meets the requirement of standard.Electrical characteristic detection will be by test equipment On oscilloscope module or the equipment such as bus instrument, universal adapter is mainly to tested multichannel GJB289A bus Module provides excitation, allows multichannel GJB289A bus module export the signal being easy to test specified, such as the bit error rate The test request bit error rate is less than 1/1000000th, then adapter control tested module continuously repeats output The particular law signals such as 0x5555,0xAAAA, 0xFFFF, 0x0000, total amount of data is more than a megabit, For test equipment or bus analysis instrument collection analysis.

General Multiplex bus interface module measuring technology has a following advantage:

1. it is changed into towards internal field replaceable units and towards letter by the functional test towards LRU Number performance test, improve testing level and product quality；

2., according to different types of internal bus, CPU module may be designed as CPCI, VME, self-defined etc. multiple The parallel bus interface of type, has substantially met conventional multichannel GJB289A EBI in avionics system The test request of module, has preferable versatility.

It is understood that for those of ordinary skills, can be according to technical scheme And inventive concept in addition equivalent or change, and all these change or replace and all should belong to institute of the present invention Attached scope of the claims.

Claims

1., for a universal adapter for multiple bus interface module test, comprise CPU module (1) With signal conversion module (2), it is characterised in that:

Described signal conversion module (1) be used for connecting tested multichannel GJB289A bus interface module (3) with CPU module (1)；

Described CPU module (1) is used for by parallel bus tested multichannel GJB289A bus interface module (3) Excitation is provided, makes tested multichannel GJB289A bus interface module export fixing data or signal waveform, for total Line analysis device analysis.

Universal adapter the most according to claim 1, it is characterised in that described signal conversion module bag Containing the signal plug matched with tested multichannel GJB289A bus interface module and the fastening being connected with CPU module Connector.

Universal adapter the most according to claim 1, it is characterised in that described CPU module includes place Reason device, FLASH, SRAM, FPGA, electrical level transferring chip, RS232 interface chip, processor respectively with FLASH, SRAM, FPGA, electrical level transferring chip, RS232 interface chip connect, and FPGA is also with electrical level transferring chip even Connect, provide excitation to tested multichannel GJB289A bus interface module (3) under the control of a processor.

4. according to the universal adapter described in claim 1 or 3, it is characterised in that described CPU module root ARM, PowerPC or PC104+ is used according to the parallel bus form of tested multichannel GJB289A bus interface module Module.