Detection of multiple hits within a device having multiple sense

Details Detection of multiple hits within a device having multiple sense Detection of multiple hits within a device having multiple sense

1993-03-31

1995-06-20

Nguyen, Viet Q.

Static information storage and retrieval

Associative memories

Ferroelectric cell

365196, 365201, 365 72, 326 36, 326106, G11C 1500, H01L 2710

Patent

active

054266025

ABSTRACT:
A hit detector for detecting and distinguishing between single and multiple hits within a device having multiple sense outputs, such as content-addressable memory (CAM). For a 64-word CAM, the hit detector has three stages. The first stage is a set of two matrices of individual detectors connected to sense lines of the CAM for detecting single or multiple hits indicated by one or more sense lines. The second stage is a set of four matrices, two each connected to the outputs of a matrix of the first stage for resolving the outputs of the first stage. The third stage is combinational logic for resolving the outputs from the second stage. The matrices of the first stage are groups of individual detectors divided into subgroups, with each detector within a subgroup associated with a separate sense line of the CAM. All detectors within a subgroup share a common detect line that indicates a hit if one or more detectors within the subgroup detects a hit from an associated sense line. The sense lines are associated with the two matrices in different order so that no subgroup of the first matrix has more than one sense line in common with a subgroup of the second matrix. This ordering ensures that a multiple hit causes more than one detect line in at least one of the matrices to indicate a hit.

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