Mattingly, Stanger, Malur & Brundidge PC
Semiconductor device
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.
Hitachi, Ltd.
G Y G G G
G06F Y02D G11C G06F G11C
inventional additional inventional inventional additional
Naohiko Kunio Hiroyuki Takao Osamu
Irie Uchiyama Mizuno Watanabe Nishii