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Constrained via minimization for systolic arrays

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1 Author(s)
Molitor, P. ; Dept. of Comput. Sci., Univ. des Saarlandes, Saarbrucken, West Germany

Due to progress in VLSI technology, algorithm-oriented array architectures such as systolic arrays or bit-slice structures appear to be effective, feasible, and economic. The constrained-via-minimization problem for circuits composed of arrays of identical cells C is discussed. To guarantee identical electrical behavior of all instances of C and to allow further hierarchical processing, it is desirable to handle all instances of C identically. To this end, layer assignments of circuits needing a minimal number of via holes are sought. It is shown that this problem can be solved by embedding C on the torus, i.e. by identifying the northern boundary of C with the southern boundary, and the eastern one with the western one. The time complexity of the proposed algorithm is O(m3C), where mC is the number of routing segments in C

Published in:

Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:9 ,  Issue: 5 )