High speed product term allocation structure supporting logic it

Details High speed product term allocation structure supporting logic it High speed product term allocation structure supporting logic it

1995-05-26

1996-10-08

Westin, Edward P.

Electronic digital logic circuitry

Multifunctional or programmable

Array

H03K 1900

Patent

active

055635296

ABSTRACT:
A macrocell for flexibly routing product terms from an AND array to output terminals of a programmable logic device. The macrocell allows a variable number of product terms to be retained by the macrocell, and a variable number of product terms to be exported to a second macrocell. The direction in which the product terms are exported can be controlled. The macrocell further allows a variable number of product terms to be received from a third macrocell and routed either to the output terminal of the first macrocell or to the second macrocell in combination with those product terms exported from the first macrocell. Methods for routing product terms using macrocells within a programmable logic device are also provided.

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