Method and circuit for using a function generator of a programma

Details Method and circuit for using a function generator of a programma Method and circuit for using a function generator of a programma

Filed on

1995-09-29

Date issued

1998-10-06

Examiner

Westin, Edward P.

Patent Class

Electronic digital logic circuitry

SubClass

Multifunctional or programmable

SubSubClass

Array

Other Related Categories

326 53, H03K 738, H03K 1921

Type

Patent

Status

active

Patent number

058182551

Description

ABSTRACT:
A carry logic circuit for a programmable logic device which uses a single function generator to create a carry propagate signal (P) and an output signal (S). The function generator includes a plurality of signal generation circuits, each of which is controlled by a first input signal (A) and a second input signal (B). One of the signal generation circuits is programmed to provide a desired carry propagate signal (P) in response to the first and second input signals (A,B). The carry propagate signal (P) is transmitted for use outside of the function generator to perform a carry propagation function for the carry logic circuit. The remaining signal generation circuits are programmed to generate one or more intermediate output signals in response to the first and second input signals (A,B). These intermediate output signals, in combination with carry propagate signal (P), are representative of the desired output signal (S). The function generator also includes a signal selection circuit which is coupled to the signal generation circuits. The signal selection circuit passes a signal which is selected from the group consisting of the carry propagate signal (P) and the intermediate output signals, thereby providing the output signal (S).

REFERENCES:
patent: 5349250 (1994-09-01), New
patent: 5386156 (1995-01-01), Britton et al.
patent: 5436574 (1995-07-01), Veenstra
patent: 5488315 (1996-01-01), Mahant-Shetti et al.

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