Static information storage and retrieval – Powering – Conservation of power
Reexamination Certificate
2006-04-04
2006-04-04
Mai, Son (Department: 2827)
Static information storage and retrieval
Powering
Conservation of power
C365S226000, C713S323000, C713S324000
Reexamination Certificate
active
07023757
ABSTRACT:
When a leakage current of a circuit block under a non-use state is reduced by means of a power switch, frequent ON/OFF operations of the switch within a short time invite an increase of consumed power, on the contrary. Because a pre-heating time is necessary from turn-on of the switch till the circuit block becomes usable, control of the switch during an operation deteriorates a processing time of a semiconductor device. The switch is ON/OFF-controlled with a task duration time of a CPU core for controlling logic circuits and memory cores as a unit. After the switch is turned off, the switch is again turned on before termination of the task in consideration of the pre-heating time.
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Irie Naohiko
Mizuno Hiroyuki
Nishii Osamu
Uchiyama Kunio
Watanabe Takao
Hitachi , Ltd.
Mai Son
Mattingly ,Stanger ,Malur & Brundidge, P.C.
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