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1.引言 随着微处理机在数字系统中的广泛应用,系统对微机的可靠性要求越来越高,为了保证微机的可用性,有必要对微机的CPU作周期性测试,CPU功能自测试就是一种方便、实用、有效的测试方法。采用自测试主要存在两大问题:一是因没有外部测试器CPU要执行一组特殊指令I_V={I_(V1),I_(V2),…,I_(Vk)},用以验证各测试执行结果的有效性,而在执行I_(Vi)∈I_V,时,CPU也可能发生故障;二是在执行测试时,某些故障可能导
1. Introduction With the widespread use of microprocessors in digital systems, the system is increasingly demanding on the reliability of the microcomputer. In order to ensure the availability of the microcomputer, it is necessary to periodically test the CPU of the microcomputer. The CPU function is self-tested A convenient, practical and effective test method. There are two major problems with self-test: First, there is no external tester CPU to perform a set of special instructions I_V = {I_ (V1), I_ (V2), ..., I_ (Vk)}, The validity of the results, and in the implementation of I_ (Vi) ∈ I_V, the CPU may also be a failure; the second is the implementation of the test, some of the faults may guide