征兆测试新方法

Novel way of syndrome testing

征兆测试和奇偶测试是已经使用多年的基于穷尽输入的固定型故障测试方法。在征兆测试与奇偶测试相结合的基础上,提出了一种新的征兆测试方法,即三阶征兆测试法。本方法的特点在于提高测试效率的同时也提高了征兆测试的故障覆盖率,使得原来征兆不可测的电路也可以进行征兆测试。其主要思想是在传统征兆测试的基础上首先引进奇偶测试,对被测电路进行预处理,提高测试效率;然后,对征兆测试作进一步升华处理,成为二阶、三阶征兆测试,提高测试的故障覆盖率。通过对部分基准电路和常用电路的测试实验验证了所提新方法的实用性和有效性。

Syndrome testing and parity testing are exhaustive input based fixed fault testing methods. They have been employed for many years. The paper proposes a novel syndrome testing method, named third order syndrome testing, which combines syndrome testing and parity testing. Its main feature is that both the testing efficiency and the fault coverage are improved so that syndrome testing can be per- formed on the circuits whose syndrome could not be tested. Based on the traditional syndrome testing, parity testing is introduced to preprocess the circuits drome testing is enhanced to be the second and the thus improving the testing efficiency. Then, syn third order syndrome testing, thus improving the fault coverage. Experiments on reference circuits and commonly used circuits demonstrate the practica bility and effectiveness of the proposal.