Method and apparatus for embedded read only memory in static ran

Details Method and apparatus for embedded read only memory in static ran Method and apparatus for embedded read only memory in static ran

1998-05-13

2000-03-21

Nelms, David

Static information storage and retrieval

Read/write circuit

Having fuse element

365154, G11C 700

Patent

active

060410086

ABSTRACT:
The present invention is embodied in a method and apparatus which provides a ROM embedded in a SRAM array utilizing the existing support circuitry of the SRAM array. By disabling or not disabling SRAM cells by removing or not removing the ground or power connections to each cell in different combinations, a pair of SRAM cells can be used to permanently store a specified logic state, i.e. function as a ROM cell. Additionally, a single SRAM cell and a reference signal can also be programmed to function as a ROM cell.

REFERENCES:
patent: 4855803 (1989-08-01), Azumai et al.
patent: 4995004 (1991-02-01), Lee
patent: 5012181 (1991-04-01), Eccleston
patent: 5365475 (1994-11-01), Matsumura et al.
patent: 5426614 (1995-06-01), Harward
patent: 5487037 (1996-01-01), Lee
patent: 5744962 (1998-04-01), Alber et al.

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