提出了一种采用扫描选通信号基于扫描的自测试方法.各扫描链所对应的权值可通过该算法计算出.在这种测试模式下,测试响应的收集可能在任意时钟进行.该方法力求最大限度地提高数字系统内部节点的可控度和可观测度,从而在几乎不带来额外硬件开销的情况下获得尽可能高的故障覆盖率.实验证明,此方法取得了很好的效果. A scan-based self-test method using scan gating signals is proposed, and the corresponding weight of each scan chain can be calculated by this algorithm. In this test mode, the collection of test responses may be performed at any clock. It strives to maximize the controllability and observability of nodes within the digital system, resulting in the highest possible fault coverage with little or no additional hardware overhead. Experiments show that this approach works well .