公开(公告)号：JPH02294142A

公开(公告)日：1990-12-05

申请号：JP8059290

申请日：1990-03-28

Applicant: ADVANCED MICRO DEVICES INC

Inventor： DEIIN GURAMUROOZU ,  JIYOO UIRIAMU PIITAASON

IPC: H04M1/00 ,  G06F1/32 ,  G06F13/24 ,  H04L29/08 ,  H04L29/12 ,  H04M1/253

Abstract: PURPOSE: To reduce power consumption by making a peripheral device speed up a clock signal to a microprocessor automatically when the peripheral device detects an event requiring service. CONSTITUTION: A microprocessor 10 reads in and writes in data to a peripheral device 12 including a clock divider 20 which is under the control of the peripheral device 12 as well as the microprocessor 10. The peripheral device 12 at the same time when an interruption to the microprocessor 10 occurs, for example, when a packet arrives from a central station, increases the speed of a clock to the microprocessor 10. The microprocessor uses the high-speed clock signal to process packets and instructs the peripheral device 12 to decrease the frequency to the lower than that of the clock so that electric power is not consumed thereafter. Consequently, the power consumption can be reduced.

公开(公告)号：JPH04255043A

公开(公告)日：1992-09-10

申请号：JP20177091

申请日：1991-08-12

Applicant: ADVANCED MICRO DEVICES INC

Inventor： DEIIN GURAMUROOZU ,  DEIRU GARITSUKU

IPC: G06F12/06 ,  G06F1/04 ,  G06F1/32 ,  G06F12/00

Abstract: PURPOSE: To reduce the power consumption of a processing system by accessing an external memory for data and/or an instruction and permitting an external memory activating time period to be independent of the number of external memory accesses per unit time. CONSTITUTION: A control system has a clock means 12 for supplying a clock signal which decides external memory access speed and an activation period control means 28 connected to the means 12 and arrayed so as to activate the external memory for a period of time of access to each memory independent of a speed of access to the external memory.