Self-Checking State Machine Realizations in CMOS
Progress rept. 1 Apr-30 Jun 1994
NORTH CAROLINA AGRICULTURAL AND TECHNICAL STATE UNIV GREENSBORO DEPT OF ELECTRICAL ENGINEERING
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In this reporting period, we have studied the currently available techniques for designing totally self-check checkers for m-out-of-n codes. Such codes can be used for state assignment in self-checking state machines. The major advantage of m-out-of-n codes is that they can detect single and unidirectional multibit errors in the encoded information bits. Thus, if a circuit is designed such that its output forms an m-out-of-n code, any fault in the circuit which creates a single bit error or unidirectional multibit error at the output can be detected on-line. On-line error detection, also known as self- checking, can be accomplished by using a checker to monitor the circuit output. The output of the checker is 01 or 10 if there is no fault in the circuit under test or in the checker itself, otherwise the output will be 00 or 11.
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