This paper proposes a cascaded multicasting scan (CMS) architecture with simple control logic and low hardware overhead for test data compression. Instead of specifying all the addresses of the scan chains that will receive the test data in each broadcast, CMS specifies only the address of the first scan chain using log₂(n) control bits in each broadcast on an n-scan chain architecture. CMS relies on test pattern compatibility analysis to determine the scan chain order to minimize the number of broadcasts. Experimental results show that with a much smaller hardware overhead CMS achieves a compression effect comparable to that attained by previous work on multicasting scan. The runtime for synthesizing a CMS architecture is also much smaller than that used by previous work.

本文提出了一种具有简单控制逻辑和低硬件开销的级联多播扫描（CMS）架构，用于测试数据压缩。而不是指定将在每个广播接收测试数据扫描链的所有地址，CMS仅指定使用日志中的第一扫描链的地址₂（Ñ上的）控制位在每一个广播Ñ-扫描链架构。CMS依靠测试模式兼容性分析来确定扫描链顺序，以最大程度地减少广播数量。实验结果表明，以更少的硬件开销，CMS可以实现与以前的多播扫描工作相当的压缩效果。合成CMS体系结构的运行时间也比以前的工作所用的运行时间小得多。