采用测试向量合并的多扫描链嫁接测试

摘要

多扫描链测试技术能有效减少测试用时和压缩测试数据,但该技术需要较多的数据输入通道,因而会导致测试成本增加.为了解决这种矛盾,一种多扫描链嫁接机制被提出.该方案错位产生基准向量,根据向量间的相容性合并扫描链的驱动端口.实验结果表明,所提方案在保持多扫描链高速测试的同时既能减少测试数据输入通道,又可获得较高的测试数据压缩率.%Although multiple scan chains can effectively decrease test time and reduce the test data, it requires more input channels so that the test cost is increased. To solve the problem, a grafting mechanism with multiple scan chains is proposed, which generates base vectors using a dislocation method in order to merge as many driving ends as possible based on correlation in the test vector. Experimental results show that the proposed scheme uses fewer channels for the test data input and provides a higher compression ratio while maintaining high-speed testing for multiple scan chains.