Semiconductor device with a memory circuit

Details Semiconductor device with a memory circuit Semiconductor device with a memory circuit

1985-02-15

1988-05-10

Fears, Terrell W.

Static information storage and retrieval

Read only systems

Semiconductive

365178, 365182, 364200, G11C 1140

Patent

active

047440546

ABSTRACT:
A semiconductor device has a first ROM and a second ROM on a single semiconductor chip. To write information in the first ROM, a contact mask pattern is used by which wirings are formed on the chip, while information is written in the second ROM when memory transistors are formed on the chip. The first ROM stores the non-commonly used information of the program to be stored, or a specific user supplied program, and the second ROM stores predetermined and commonly used information of the program to be stored. Thus, a semiconductor device having a fixed memory in which a large capacity of information is stored can be provided to a user within a short period of time.

REFERENCES:
patent: 4057787 (1977-11-01), Heuer et al.
patent: 4059826 (1977-11-01), Rogers

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