Semiconductor integrated circuit device and process for manufact

Details Semiconductor integrated circuit device and process for manufact Semiconductor integrated circuit device and process for manufact

1992-08-14

1993-12-14

Trans, Vincent N.

Boots, shoes, and leggings

364489, 364488, G06F 1560, H01L 2700

Patent

active

052709442

ABSTRACT:
A method of fabrication comprising forming a semiconductor integrated circuit device LSI which has a microcomputer CPU furnished with an EPROM, determining a program for controlling the microcomputer CPU and to be set in the EPROM (performing an initial evaluation) while information is being written into and erased from the EPROM built in the semiconductor integrated circuit device LSI, and thereafter forming a semiconductor integrated circuit device LSI in which the EPROM of the first-mentioned semiconductor integrated circuit device LSI is replaced with a mask ROM. In replacing the EPROM with the mask ROM, peripheral circuits required for both the EPROM and the mask ROM have their circuit arrangements held basically the same, and specific peripheral circuits for use in only the EPROM have their circuit regions left as they are as logically inactive regions.

REFERENCES:
patent: 4833620 (1989-05-01), Takahashi
patent: 4901259 (1990-02-01), Watkins

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