公开(公告)号：JPH10340129A

公开(公告)日：1998-12-22

申请号：JP53198

申请日：1998-01-05

Applicant: CIRRUS LOGIC INC

Inventor： HILLMAN JOHN ,  COOKE CHRISTOPHER

IPC: G06F1/04 ,  G06F1/32 ,  G06F9/30

Abstract: PROBLEM TO BE SOLVED: To reduce an power consumption amount by a register by deciding a registers that do not take part in a processing cycle based on the analysis result of each microinstruction and preventing them from being clocked in a processing cycle. SOLUTION: A decode logic 28 examines an appropriate field or a bit position of a microinstruction which is a set of all kinds of bits that control each processing cycle and decides which register 20 takes parts in a certain processing cycle. As for a register 20 which is decided as not taking part in the processing cycle here, a clock signal from a clock source 24 is blocked and the clock signal is prevented from adding to a clock input 21 of the register 20 through a corresponding AND gate 26. That makes it possible to reduce the total used amount of power in a system by reducing the power consumption of an unused register in a certain processing cycle from the power consumption of used registers.