Thang T Vo

US Patent:

53093828, May 3, 1994

Filed:

Oct 1, 1992

Appl. No.:

7/956867

Inventors:

Leilani Tamura - Redwood City CA
Thang Vo - Fremont CA

Assignee:

Silicon Graphics, Inc. - Mountain View CA

International Classification:

G06F 738

US Classification:

36471508

Abstract:

A binary shifter which utilizes shifter control logic to shift a 64-bit binary word by shift amounts up to 63 bit positions using a pre-multiplexer and shifter array configuration capable of shifting up to 32 bit positions. The shifter control logic executes two cycles of shifting operations to achieve shift amounts greater than 32 bits. An improved shifter pre-multiplexer and array for shifting 64-bit binary words by up to 32 bit positions in one cycle is disclosed. The improved shifter pre-multiplexer and array uses 9:1 pre-multiplexer cells with tristate outputs to place input data on selected discrete sections of horizontal data lines allowing for a reduced number of cells and control lines.

US Patent:

47379260, Apr 12, 1988

Filed:

Jan 21, 1986

Appl. No.:

6/820384

Inventors:

Thang Vo - Santa Clara CA
Patrick P. Gelsinger - Santa Clara CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

G06F 750

US Classification:

364787

Abstract:

An improved scheme for generating a carry lookahead is described. An irregular grouping, wherein large bit groups are used in the middle and shorter bit groups are used at the ends, provides for a reduction in carry propagation delay.