Testable design techniques for systolic motion estimators based on M-testability conditions are proposed in this paper. The whole motion estimator can be viewed as a two-dimensional iterative logic array （ILA） of processing elements （PEs） and multiplying elements （MULs）. The functions of each PE and MUL are modified to be bijective to meet the M-testable conditions. The number of test patterns is 2w, where w denotes the word length of a PE. The proposed testable design techniques are also suitable for built-in self-test implementation. According to experimental results, our approaches can achieve 99.27 % fault coverage. The area overhead is about 9 %. To verify our approaches, an experimental chip is also implemented.
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