Identifying content-addressable memory entries differing...

Details Identifying content-addressable memory entries differing... Identifying content-addressable memory entries differing...

2007-09-04

2007-09-04

Yoha, Connie C. (Department: 2827)

Static information storage and retrieval

Associative memories

Ferroelectric cell

C365S205000, C365S189070

Reexamination Certificate

active

11252960

ABSTRACT:
A content-addressable memory entry is identified as being matched if it matches all bit positions of a lookup word or does not match for less than a predetermined number of bit positions. A match line of the content-addressable memory entry is precharged. During a subsequent matching phase, each of the bit positions of the content-addressable memory entry provides a discharge path for the precharged match line. Whether or not the content-addressable memory should be identified as being matched is then determined typically by comparing the match reference voltage of the match line to a predetermined voltage level at a predetermined time, with the predetermined voltage level and predetermined time selected for the allowed number of bit positions that do not have to be matched while still considering the content-addressable memory entry to have been matched, and the implementation technology of the embodiment.

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