As a standard technique of test and design - for - testability for testing the digital printed circuit board , boundary - scan technique has obtained widespread application in electronic equipment 边界扫描技术是一种标准的数字电路测试及可测试性设计方法,它在工业界得到了广泛的应用。
In order to enhance the testability , reduce the maintenance costs of the electronic equipment , it is very important to develop a boundary - scan test system ( bsts ) 随着具有边界扫描结构的芯片在装备中的大量应用,开发出实用的边界扫描测试系统,对于提高装备的可测试性,降低维护和保障费用具有重要意义。
At the same time , the wide application of the mixed - signal circuits gave a great challenge for the present test methods . the testability of the mixed - signal circuits has become an important research task 而数模混合电路的广泛应用给现有的测试方法也提出了新的挑战,其可测试性问题成为一个重要的研究课题。
Based on the fault / failure model , we establish a new model ~ stdm ( static testability detecting model ) to measure software testability , and then design and implement a practical tool to fulfill it 基于软件的故障失效模型,本文构建了软件可测试性量化检测的stdm理论模型,并设计实现了基于该理论模型的可测试性检测工具。
After the analysis of several testability models this paper finds that different models fit for different phases of software test . during system design phase , we can use drr model to go on testability design 本文通过对可测试性模型的分析得出不同的模型适合不同的测试阶段,然后针对各个阶段的特点设计了软件的可测试性度量方法。
2 ) we put up the experiments mainly based on the cpld for the faults emulation on some typical digital circuits . and we built the transition function databases according to the faulty testing results 2 、以cpld为核心进行了一些典型数字电路的故障模拟仿真试验,建立被测电路的状态转移函数集,为进一步研究电路的可测试性和故障诊断提供了数据。
( 3 ) we put up the experiments for the faults emulation on some digital signal circuits . these experiments were mainly based on the cpld / fpga and we built the testing faulty databases according to these circuits ( 3 )以可编程逻辑器件为核心进行了一些典型数字电路的故障模拟仿真试验,并建立相应的电路故障测试集数据库,为这些电路的可测试性研究提供数据。
For quality estimate model , it describes the quality factors ( maintainability , reusability etc ) and guide lines ( mensurability , readability etc ) that imported from halstead , mccabe , verilog metric methodologys 质量评价模型描述了从halstead 、 mccabe的度量方法学和verilog引入的质量方法学中的质量因素(可维护性、可重用性等)和质量准则(可测试性、可读性等) 。
Abstract : bounadary - scan technology is being accepted by m ost engineers as a design - for - testability technique and plays an important role in the test and fault diagnosis of electonical devices . in this paper , a boundary - scan prototype tester is introduced 文摘:边界扫描是一种正在被人们普遍接受的可测试性设计技术,在电子设备测试和故障诊断中发挥着越来越重要的作用。
Testability is an important quality characteristic of software , it refers to the probability that a piece of software will fail on its next execution during testing ( with a particular assumed input distribution ) if this software includes a fault 软件的可测试性作为一个软件度量指标,是指软件在任意给定输入集合下进行测试的过程中,其中存在的错误能够被揭示出来的概率。