Circuit for fast carry and logic

Details Circuit for fast carry and logic Circuit for fast carry and logic

1994-09-20

1996-01-02

Nelms, David C.

Electronic digital logic circuitry

Multifunctional or programmable

Having details of setting or programming of interconnections...

326 39, 326 41, 36518908, H03K 1920

Patent

active

054812062

ABSTRACT:
Programmable logic devices which include multiple blocks of combinatorial function generators and storage elements, and which are interconnected by a programmable interconnect structure are used, among other things for performing arithmetic functions which use logic for generating the carry function. When a large number of bits is to be processed, the carry function typically causes significant delay or requires significant additional components to achieve a result at high speed. The present invention provides dedicated hardware within the logic blocks for performing the carry function quickly and with a minimum number of components. The circuit includes additional structures to allow the fast carry hardware to perform additional commonly used functions.

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Xilinx Programmable Gate Array Data Book, 1989, pp. 6-30 through 6-44, available from Xilinx, Inc., 2100 Logic Drive, San Jose, California 95124.

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