Static information storage and retrieval – Powering – Conservation of power
Reexamination Certificate
2009-01-26
2010-12-28
Le, Thong Q (Department: 2827)
Static information storage and retrieval
Powering
Conservation of power
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
Le Thong Q
Smith Murray
Xilinx , Inc.
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