Read only memory capable of writing data and method of writing/r

Details Read only memory capable of writing data and method of writing/r Read only memory capable of writing data and method of writing/r

1994-02-25

1995-06-20

Popek, Joseph A.

Static information storage and retrieval

Read/write circuit

Testing

36518901, 365227, G11C 700

Patent

active

054266092

ABSTRACT:
A read only memory capable of writing data, which is provided with a number of "0" judging circuit (8) judging whether or not the number of bits of "0" of data to be written in the memory cell array (1) is more than a half or more of a predetermined bit length, a monitor bit cell group (9) storing the above judge result by corresponding it to the respective data, and with a data inverting select circuit (12) outputting the values of the respective bits of the data after inverting them to a data writing/reading circuit (2) when the number of bits of "0" in the data to be written is judged to be a half or more of the predetermined bit length, and outputting the values of the respective bits of data read from the memory cell array (1) after inverting them when the monitor bit cell group (9) stored that the number of bits of "0" in the data to be read is a half or more of the predetermined bit length, and is capable of reducing an aluminum width of a power source of a PROM, and, when the data length to be written by one writing operation is enlarged, is no need to enlarge the aluminum width of the power source line and is capable of reducing electric current to be consumed for there.

REFERENCES:
patent: 5258959 (1993-11-01), Dallabora et al.
patent: 5287326 (1994-02-01), Hirata
patent: 5295108 (1994-03-01), Higa

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