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Modified Scan Flip-Flop for Low Power Testing

Scanning of test vectors during testing causes unnecessary and excessive switching in the combinational circuit compared to that in the normal operation. In this paper, we propose a modified design of a scan flip-flop which eliminates the power consumed due to unnecessary switching in the combinational circuit during scan shift, with a little impact on performance. The new scan flip-flop disables the slave latch during scan, and uses an alternate low cost dynamic latch in the scan path instead. Methods for generating slave latch disable control signal are also presented.