Partial-sized priority encoder circuit having look-ahead capabil

Details Partial-sized priority encoder circuit having look-ahead capabil Partial-sized priority encoder circuit having look-ahead capabil

1991-03-19

1993-11-23

Fleming, Michael R.

Coded data generation or conversion

Digital code to digital code converters

Tree structure

341160, 3642599, 364247, 3642412, 364DIG1, 3647151, G06F 700, G06F 1300

Patent

active

052652580

ABSTRACT:
In an integrated circuit microprocessor, an M-bit priority encoder circuit indicates the highest priority bit position that is set in a first portion of an N-bit (N generally being greater than M) data word and provides control information regarding the number of bits that are set. If more than one bit is set, the highest priority bit is reset, the first portion is re-analyzed, and highest priority bit information and control information are again provided. If only one bit or no bit is set in the first portion, a second portion is analyzed, and highest priority bit information and control information regarding the second portion is provided. Analysis of the second portion, and of any subsequent portions, continues in similar fashion until no further bit positions are determined to be set in the data word.

REFERENCES:
patent: 4348741 (1982-09-01), McAlister
patent: 4887084 (1989-12-01), Yamaguchi
patent: 4924421 (1990-05-01), Seguchi
patent: 5083261 (1992-01-01), Wilkie
patent: 5091874 (1992-02-01), Watanabe et al.
patent: 5095460 (1992-03-01), Rodeheffer
patent: 5123105 (1992-06-01), Wyland et al.
patent: 5160923 (1992-11-01), Sugawara et al.

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