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Partitions of the set of blocks of a computer logic graph, also called a block graph, into subsets called modules demonstrate that a two-region relationship exists between P, the average number of pins per module, and B, the average number of blocks per module. In the first region, P = KBr, where K is the average number of pins per block and 0.57 = r = 0.75. In the second region, that is, where the number of modules is small (i.e., 1-5), P is less than predicted by the above formula and is given by a more complex relationship. These conclusions resulted from controlled partitioning experiments performed using a computer program to partition four logic graphs varying in size from 500 to 13 000 circuits representing three different computers. The size of a block varied from one NOR circuit in one of the block graphs to a 30-circuit chip in one of the other block graphs.
Hardware implementation, logic package pin requirements, logic partitioning, pins versus blocks relation, pins versus circuits relation.

R. Russo and B. Landman, "On a Pin Versus Block Relationship For Partitions of Logic Graphs," in IEEE Transactions on Computers, vol. 20, no. , pp. 1469-1479, 1971.
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