TESTABILITY MEASURE ANALYSIS IN DIGITAL NETWORKS.

This paper first defines signal line fault detection testability measure (FDTM) for stuck-at-0 and stuck-at-1 faults. The FDTM is obtained from signal line's 0, 1-controllability and observability measures. This measure is analyzed in terms of the relationships between FDTM and undetected faults under the condition of the D-algorithm ATPG program execution for a certain time. Then, node (element/functional block) testability measure is defined from node's input 0, 1-controllability and observability measures. This measure is also evaluated in terms of the relationships between node testability measure regions and node fault coverage under the condition of the ATPG program execution for a certain time. Finally, the proposed testability measures applications in early design phases and test generation systems are discussed.