Memory subsystem

Details Memory subsystem Memory subsystem

1983-09-22

1991-01-01

Clark, David L.

Boots, shoes, and leggings

G06F 1210

Patent

active

049823604

ABSTRACT:
A memory subsystem including a read-only memory (ROM), a random access read/write memory (RAM) and a selection system for selecting the output of one of the memories for use by downstream circuitry. The selection of the output is based on input address signals so that the contents of the RAM can substitute for the contents of selected locations in the ROM. If a substitution is to be made, an entry is made in a content addressable memory, which stores addresses for which the RAM output is to be substituted for ROM output. A test system is provided to verify the contents of the content addressable memory.

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Microelectronics and Reliability, vol. 15, No. 4, pp. 285-295, Pergamon Press, Oxford, Napoleon Cavlan: "Structure and Applications of Field Programmable Logic Arrays," p. 291, line 5-p. 292, line 19.
IEEE Transactions on Computers, vol. C-27, No. 9, Sep. 1978, IEEE New York US; CV Ramamoorthy et al.: "A Design of a Fast Cellular Associative Memory for Ordered Retrieval", p. 812, right handed col., lines 7-22.
Patent Abstracts of Japan, vol. 7, No. 90 (P-191, [1235], 14th Apr. 1983; & JP-A-58 16 350 (Tokyo Shibaura Denki KK), 31-01-1983.

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