Method and apparatus for expanding the width of a content addres

Details Method and apparatus for expanding the width of a content addres Method and apparatus for expanding the width of a content addres

1993-04-06

1995-08-08

Rudolph, Rebecca L.

Boots, shoes, and leggings

364DIG1, 364253, 3642531, 364245, 36424531, G06F 1200

Patent

active

054407150

ABSTRACT:
Apparatus and a method for easily expanding the effective width of the data words of a CAM without significantly increasing the basic width of the data storage registers or comparand register. A plurality of comparison blocks each include a register for data words having a predetermined width. Each data word includes a start bit, which indicates that a data word is the first data word of a much larger data word (or data line), and a chain bit, which indicates that a match has occurred between part of a comparand and the data word stored in the register. A maskable comparator provides a match output signal. The start bit is initially loaded into the chain-bit register for a data word. A latch is provided for storing the value of the chain bit from a preceding register into the chain-bit register of a following register. A priority encoder receives the match output signals from each of the comparators of the comparison blocks to identify the highest-priority comparison block, and the corresponding data line.

REFERENCES:
patent: 4575818 (1986-03-01), Almy et al.
patent: 4670858 (1987-06-01), Almy
patent: 4959811 (1990-09-01), Szczepanek
patent: 5053991 (1991-10-01), Burrows
patent: 5072422 (1991-12-01), Rachels
patent: 5130945 (1992-07-01), Hamamoto et al.
patent: 5319762 (1994-06-01), Mayer

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