Abstract
A procedure for multiple-output combinational circuits is presented that yields the optimum space compressor while using counting for time compression. The procedure is intended for the built-in selftest environment where output response data compression is appropriate. Optimum is defined as the minimum number of error patterns missed by the combination of space and time compression. The procedure uses the fast Walsh transform to determine the number of errors missed by each linear combination for all possible space-compression combinations. A illustrative example is included to show the effectiveness of the algorithm. A comparison between cases with and without space compression is included.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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