Programmable logic having selectable output states for initializ

Details Programmable logic having selectable output states for initializ Programmable logic having selectable output states for initializ

1993-08-25

1995-09-12

Bowler, Alyssa H.

Electronic digital logic circuitry

Multifunctional or programmable

Array

326 38, 326 39, 3642449, 364DIG1, G06F 900

Patent

active

054506085

ABSTRACT:
A programmable logic device having the capability of initializing and resetting to a specified digital state. One or more clear/preset product terms are available for initializing and resetting the macrocells of the programmable logic device. Each macrocell can be either cleared to a "0" or preset to a "1" according to the clear/preset product terms. Control bits are used to select which of the clear/preset product terms, if any, are to be used to clear and/or preset a particular macrocell. These control bits are programmable for each of the macrocells, thereby allowing each macrocell to output either a "0" or a "1", as desired by the user, independent of the other macrocells. The macrocells can be cleared and preset asynchronously.

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