Semiconductor integrated circuit device comprising memory area i

Details Semiconductor integrated circuit device comprising memory area i Semiconductor integrated circuit device comprising memory area i

1993-12-16

1995-05-30

Popek, Joseph A.

Static information storage and retrieval

Read only systems

Fusible

365 94, 365201, 365226, 365 52, G11C 1700

Patent

active

054208173

ABSTRACT:
The same bit lines are used in common to a fixed data cell array and a memory cell array. The output section of the fixed data cell array is connected to an output circuit, just like the output section of the memory cell array. In response to signal CON supplied from a computer, an array selector examines the states of the arrays and performs switching between the state where one of the arrays can be selected and the state where neither of them can be selected. In the case where an externally-programmable memory, such as an EPROM, is employed, a write control circuit operates with respect only to the memory cell array, and prohibits data from being written in the fixed data cell array. The fixed data cell array is pre-programmed as a nonvolatile memory by programming means different from that used for programming the cells of the memory cell array.

REFERENCES:
patent: 4419747 (1983-12-01), Jordan
patent: 4451903 (1984-05-01), Jordan
patent: 4811303 (1989-03-01), Hirai

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