Fast CMOS logic with programmable logic control

Details Fast CMOS logic with programmable logic control Fast CMOS logic with programmable logic control

1993-05-26

1995-08-08

Westin, Edward P.

Electronic digital logic circuitry

Multifunctional or programmable

Array

326 41, H03K 17173

Patent

active

054402476

ABSTRACT:
A logic circuit having a programmable first logic circuit stage and a fixed or dedicated combinatorial second logic circuit stage, serving as a macrocell for the first logic circuit stage. At least one input to the logic circuit is connected directly to the second stage, bypassing the first stage. The first stage may be a programmable logic device with a programmable AND plane followed by an OR plane, and is functionally flexible. The second stage has at least two groups of CMOS logic gates arranged in sequence and connected in a fixed manner by hardwiring so as to implement a specified combinatorial logic function that is representable in sum-of-products form, and is fast compared to the first stage. The outputs from the first stage control logic operations of the second stage upon the directly connected input or inputs.

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