Single-Pass Methods for Generating Test Patterns for Sequential Circuits

摘要

A single-pass method for generating test patterns for sequential circuits operates upon an iterative array of time-frames representing the circuit. A mapping function is inserted at the end of each time-frame. Fault objects arriving at circuit next-state lines are mapped into good next-state fault objects and are placed onto corresponding present-state lines for a next time-frame. The good next-state mapping permits fault-propagation and path-enabling function size to be bounded by a size established during an initial time-frame. Path-enabling functions created during the initial time-frame are saved and are reused during subsequent time-frames. A search for test patterns continues from one time-frame to a next until a valid test pattern is found for each detectable fault.