Software Design Of An Build-in Test System For Communication Equipment

Compared with the traditional off-line testing of equipment through external testing instruments,Built-in Test(BIT)can detect the fault inside the equipment and locate the fault to the field or infield replaceable unit,thus quickly completing the replacement of the fault unit and ensuring the operational capability of the equipment.From the point of view of BIT,this paper designs a software of in-machine test system applied to the fault diagnosis of communication equipment.The software platform sends test command to the hardware tested circuit through the parameter setting of the software interface,controls the hardware to perform the test task,collects,analyzes and processes the test data returned by the hardware circuit,and realizes the measurement of analog signal parameters and digital circuit Boundary scan test.Based on the requirement analysis,the paper gives the overall design of the software,and then introduces the design and implementation process of each functional module in detail.The main contents of this paper are as follows:1.Signal parameter measurement and display of analog BIT circuit.This part includes the parameter measurement of RF module,IF module and LF module.According to different measurement objects and different test modes,the software of the test system BIT is designed to simulate all kinds of bit control commands and parameters.It realized the large-scale measurement of the frequency and power parameters of RF signal,the modulation parameter measurement of if FM and AM signal,and the parameter measurement of 8-channel LF signal Quantity.At the same time,according to the allowable range set by the user,the measurement results are judged and distributed.2.Boundary scan test function of digital BIT integrated circuit.Based on the research of boundary scan technology and the analysis and processing of BSDL file and PCB net list file specification of integrated circuit devices,the software realizes the tasks of extracting the boundary scan information of tested circuit and network connection,obtaining the testable network of circuit board,and automatically generating test vector and building boundary scan link.The application layer sends digital BIT Control command,quickly realize the fault test and diagnosis function of digital integrated circuit.3.The software interface design of the internal test system.According to the test requirements,the instrument interface control interface is designed.The user generates the corresponding BIT control command to control the tested circuit to perform the test task,and the real-time display of the analog bit test results and the digital bit test results,which realizes the good human-computer interaction function.The software of the system is debugged and verified on the hardware platform.Each function module can work correctly and effectively,which achieves the exp ected effect of the design.