Field memory self-refreshing device utilizing a refresh clock si

Details Field memory self-refreshing device utilizing a refresh clock si Field memory self-refreshing device utilizing a refresh clock si

1992-08-17

1994-05-17

Gossage, Glenn

Static information storage and retrieval

Read/write circuit

Data refresh

365233, 36523002, 365236, G11C 11406, G11C 800

Patent

active

053134281

ABSTRACT:
A field memory self-refreshing device self-refreshes a field memory with a refresh clock signal derived from a reference clock and a self-refresh clock signal not derived from the reference clock. The field memory self-refreshing device has a reference clock stop determination circuit, a self-refresh clock generator and a refresh clock switching circuit. The reference clock stop determination circuit detects that input from the reference clock has stopped and outputs a reference clock stop signal when input from the reference clock stops. The self-refresh clock generator generates the basis for the self-refresh clock signal used for self-refreshing of the field memory when the reference clock stops. When the refresh clock switching circuit receives the reference clock stop signal from the reference clock stop determination circuit, the refresh clock switching circuit switches from a selection of the refresh clock signal based on the reference clock to a selection of the self-refresh clock signal.

REFERENCES:
patent: 4334295 (1982-06-01), Nagami et al.
patent: 4570242 (1986-02-01), Nagami
patent: 4616346 (1986-10-01), Nakaizumi et al.
patent: 4985868 (1991-01-01), Nakano et al.

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