CPU and method for reducing CPU power consumption

Abstract

The invention provides a CPU and a method for reducing CPU power consumption. The CPU comprises functional units and a controller; the functional units comprise an instruction storage for storing instruction, an instruction storage manager for managing the access request which directs to the instruction storage, a data storage for storing data, a data storage manager for managing the access request which directs to the instruction storage and an arithmetic unit for accomplishing arithmetic and logic operations; the controller is used for controlling and coordinating the running of each functional unit, also comprises a clock control module located in the controller for judging whether the access request aiming at a certain functional unit exists in the current clock cycle; if the access request exists, the clock of the functional unit is controlled to be started in the current clock cycle; otherwise, the clock of the functional unit is controlled to be closed in the current clock cycle. By controlling the clock to be started or closed, the invention removes the power consumption of functional units in idle state, thus reducing the power consumption of the whole CPU.

Description

technical field [0001] The invention relates to the technical field of embedded systems, in particular to a CPU and a method for reducing power consumption of the CPU. Background technique [0002] The application of the CPU is very extensive. For example, the CPU is used as an important device in various SOCs (System On Chip, System On Chip). [0003] The ultra-long instruction word CPU is a single instruction to realize the parallel execution of multiple operations. The reason why it is placed in one instruction is to reduce memory access, while parallel execution increases the speed of operation. Usually a super-long instruction word has hundreds of bits and several operation instructions, and each super-long instruction word can perform several different operations. It is up to the compiler or assembler programmer to choose which operation instructions can be executed in parallel. Usually a very long instruction word (VLIW, Very Long Instruction Word) machine has only ...

AI Technical Summary

Problems solved by technology

figure 1 When the shown CPU is working, the clocks of the data storage, data storage manager, computing unit, instruction storage, instruction storage manager, and instruction reading unit are always on. A large number of high-speed CPUs generate a lot of power consumption

Images