Modular 64-bit integer adder

Details Modular 64-bit integer adder Modular 64-bit integer adder

1994-10-03

1997-06-03

Ngo, Chuong D.

Boots, shoes, and leggings

G06F 750

Patent

active

056361572

ABSTRACT:
A high speed, compact low power integer adder unit for advanced microprocessors features modular construction, low gate count and a fast add time. A 64-bit implementation is characterized by a unique combination of dual rail logic circuits and dual carry select path within each of four 16-bit adder building blocks to achieve a one gate delay increment for each additional 16-bit adder building block after the first. Each of the 16-bit adder building blocks are composed of modules that receive four of sixteen bits of the operands, and each of the modules are comprised of submodules. The submodules are in turn comprised of dual rail logic circuits with a dual carry select path so as to constitute a nested carry select architecture wherein the nesting of the dual carry select path extends from submodules to a module and from modules to a basic building block. The dual carry select paths are optimized both internal to the submodules and modules and at the submodule and module boundaries to achieve a minimum gate delay number.

REFERENCES:
patent: 3031140 (1962-04-01), Cooper
patent: 4228520 (1980-10-01), Letteney et al.
patent: 4559608 (1985-12-01), Young et al.
patent: 4682303 (1987-07-01), Uya
patent: 4689763 (1987-08-01), Fang
patent: 4870609 (1989-09-01), Yasui et al.
patent: 5018093 (1991-05-01), Shih
patent: 5027311 (1991-06-01), Zion
patent: 5027312 (1991-06-01), Knauer et al.
patent: 5134579 (1992-07-01), Oki et al.
patent: 5198993 (1993-03-01), Makakura
patent: 5396445 (1995-03-01), Lal
IBM Technical Disclosure Bulletin, vol. 30, No. 10, Mar. 1988, "Lookahead Carry Select Adder for High Performance Computer Processors", pp. 331-334.

Affiliated with

Also associated with

Rating

Modular 64-bit integer adder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Modular 64-bit integer adder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modular 64-bit integer adder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-396671