最小游程切换点标记编码压缩方法

Minimum run-changing point mark coding compression method

针对集成电路所需测试数据量庞大、测试成本过高的问题,该文提出了最小游程切换点标记编码压缩方法,将原始测试数据压缩,达到减少测试成本的目的。该方法将测试集按若干向量分组编码,利用组内向量游程切换范围的重叠关系合并游程切换点,可以将组内所有测试向量的游程位置用一个向量表示出来,突破了传统编码压缩要用编码字后缀表示游程长度的限制,相较于传统编码压缩,极大地缩短了编码字。该方法解压规则简单,硬件开销小, ISCAS 89标准电路实验结果表明:该方案压缩效果优于其他几类编码压缩方案,可为测试数据量过大提供有效解决方法。

Integrated circuit testing produces huge quantities of test data in expensive tests. This paper describes use of the minimum run-changing point mark coding compression method to compress the original test data to reduce the test costs. The method encodes the test set into several vectors and uses the overlapping relationships between the vector run range in each group to merge the run-length switching points. The run position in all the test vectors in the group can be represented by a vector which simplifies traditional coding compression. The method breaks through the limitation of using the suffix of the code word to express the length of the run, and greatly shortens the code word compared to conventional code compression. The method has simple decompression rules and low hardware overhead. Tests with the ISCAS 89 standard circuit experiment show that this compression scheme is more effective than other types of coding compression schemes.