Priority encoder

Details Priority encoder Priority encoder

2005-03-08

2005-03-08

Elms, Richard (Department: 2824)

Static information storage and retrieval

Associative memories

Ferroelectric cell

C365S189070

Reexamination Certificate

active

06865097

ABSTRACT:
A priority encoder for a content addressable memory (CAM) includes a thermometer circuit in which the priority of multiple data inputs is determined at the transistor level. Matching outputs from a CAM are fed to the priority encoder. The priority encoder is divided into a number of segments. A signal indicating a match in a higher priority segment causes lower priority segments to be disabled. Matching inputs are prioritized by way of a parallel arrangement of transistors coupled to NOR gates. The logic incorporated into the transistor arrangement prioritizes the matching inputs such that only the input having the highest priority is forwarded to an address table for decoding the address of the highest priority match.

REFERENCES:
patent: 5394353 (1995-02-01), Nusinov et al.
patent: 5852569 (1998-12-01), Srinivasan et al.
patent: 5973950 (1999-10-01), Shindo
patent: 6505271 (2003-01-01), Lien et al.

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