Partially programmable read-only memory system

Details Partially programmable read-only memory system Partially programmable read-only memory system

1988-02-19

1990-01-30

Hecker, Stuart N.

Static information storage and retrieval

Associative memories

Ferroelectric cell

36518902, 365 94, 364900, G11C 1500

Patent

active

048978132

ABSTRACT:
A non-reprogrammable ROM holding microinstruction words cooperates with a Content Addressable Memory made of a TAG Memory and Data Memory. Portions of the locations in the TAG Memory have the same address as certain locations in the ROM so that when these selected addresses occur, a multiplexer will select the updated data from the Data Memory rather that from the ROM. The entire system is placed on one chip and provides great spatial surface savings over that which would be required if only a Static RAM were used for a control storage unit to hold the microinstruction words.

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patent: 4612612 (1986-09-01), Woffinder et al.
patent: 4654847 (1987-03-01), Dutton

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