Method and apparatus for saving and restoring the state of a...

Static information storage and retrieval – Powering – Conservation of power

Reexamination Certificate

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Details

C365S189170, C365S189080, C365S154000, C365S189050, C365S230080

Reexamination Certificate

active

07859936

ABSTRACT:
A method and apparatus involving a circuit is disclosed. The circuit has separate first and second portions, where the first portion includes a first memory device such as a flip-flop, and the second portion includes a second memory device such as a latch. The first portion is selectively operated in first and second operational modes, the first portion consuming less power in the second operational mode than in the first operational mode. During the first operational mode a logical value is maintained in the flip-flop and can vary dynamically. During the second operational mode, the state that the logical value had at a point in time just before the first portion entered the second operational mode is maintained in the latch. Then, after the first portion switches from the second operational mode back to the first operational mode, the state of the logical value in the latch is restored to the flip-flop.

REFERENCES:
patent: 5917771 (1999-06-01), Hill
patent: 6240040 (2001-05-01), Akaogi et al.
patent: 6597620 (2003-07-01), McMinn

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