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RSYN: a system for automated synthesis of reliable multilevel circuits

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4 Author(s)
De, K. ; Center for Reliable & High Performance Comput., Illinois Univ., Urbana, IL, USA ; Natarajan, C. ; Nair, D. ; Banerjee, P.

Conventional logic synthesis systems are targeted towards reducing the area required by a logic block, as measured by the literal count or gate count; or, improving the performance in terms of gate delays; or, improving the testability of the synthesized circuit, as measured by the irredundancy of the resultant circuit. In this paper, we address the problem of developing reliability driven logic synthesis algorithms for multilevel logic circuits, which are integrated within the MIS synthesis system. Our procedures are based on concurrent error detection techniques that have been proposed in the past for two level circuits, and adapting those techniques to multilevel logic synthesis algorithms. Three schemes for concurrent error detection in a multilevel circuit are proposed in this paper, using which all the single stuck at faults in the circuit can be detected concurrently. The first scheme uses duplication of a given multilevel circuit with the addition of a totally self-checking comparator. The second scheme proposes a procedure to generate the multilevel circuit from a two level representation under some constraint such that, the Berger code of the output vector can be used to detect any single fault inside the circuit, except at the inputs. A constrained technology mapping procedure is also presented in this paper. The third scheme is based on parity codes on the outputs. The outputs are partitioned using a novel partitioning algorithm, and each partition is implemented using a multilevel circuit. Some additional parity coded outputs are generated. In all three schemes, all the necessary checkers are generated automatically and the whole circuit is placed and routed using the Timberwolf layout package. The area overheads for several benchmark examples are reported in this paper. The entire procedure is integrated into a new system called RSYN.<>

Published in:

Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:2 ,  Issue: 2 )

Date of Publication:

June 1994

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