Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

2006-09-08

2008-12-09

Luu, Pho M. (Department: 2824)

Static information storage and retrieval

Associative memories

C365S049160, C365S049170, C365S049180

Reexamination Certificate

active

07463501

ABSTRACT:
A CAM (Content Addressable Memory) cell includes first and second data storage portions storing data, horizontal port write gates for storing data applied through a match line pair in the data storage portions in a data write through a horizontal port, and search/read gates for driving the match lines of the match line pair in accordance with the data stored in the data storage portions in a search operation and in a data read through the horizontal port. The match lines are used as horizontal bit line pair, or signal lines for accessing the horizontal port. As the first and second data storage portions are used, it becomes possible to store ternary data, and accordingly, a write mask function of inhibiting a data write at a destination of data transfer is realized. Further, as the CAM cell is used, an arithmetic/logic operation following a search process can be executed selectively, and high speed data writing/reading becomes possible.

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