Computer-controlled automatic logic design system for semiconduc

Details Computer-controlled automatic logic design system for semiconduc Computer-controlled automatic logic design system for semiconduc

1988-03-30

1990-01-23

Lall, Parshotam S.

Boots, shoes, and leggings

364490, 364489, 364488, G06F 1560, G06F 1520

Patent

active

048962724

ABSTRACT:
There is disclosed a specific automatic logic design technique according to which, first, an initial logic circuit, which is automatically synthesized based on a "hardware description language" and using standard logic elements stored in advance as a library, is stored in a data storage unit. The logic circuit is displayed on a display device to permit an operator to assign, by using a block assignment unit, logic elements that must be grouped together as a single circuit block from the logic elements constituting the logic circuit so that the actual design conditions including restrictions for placement and wiring are satisfied. When the logic elements to be grouped together are assigned, they are combined as a circuit block before the logic circuit is subjected to automatic layout optimization processing. The logic circuit is rearranged to include the circuit block as a circuit section having a fixed internal circuit configuration. The circuit block is prohibited from being divided into several portions in the final automatic layout optimization processing.

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