Method for reducing CPU power consumption and CPU

Abstract

The invention discloses a CPU, comprising the following components: a transmission component for transmitting data or instructions between the CPU and peripheral equipment or in the CPU; and an operation and instruction logical component for finishing the non-transmission operation of various arithmetic and logical operations. The CPU further comprises a sleep order register for generating sleep trigger signals in a preset clock period when the transmitter starts working; and a clock control module for closing the clocks of the operation and instruction logical component according to the sleeptrigger signal. The invention can reduce dynamic power consumption of CPU modules not making contribution to transmission work of CPU device, thereby reducing the power consumption of the whole CPU device.

Description

technical field [0001] The invention relates to the technical field of embedded systems, in particular to a method for reducing power consumption of a CPU and a CPU with low power consumption. Background technique [0002] The CPU is widely used. For example, the CPU is used as an important device in various SOCs (System On Chip, System On Chip). In chip design and application, power consumption is an issue that must be considered, and CPU, as an important device, how to reduce its power consumption is also a direction that the existing technology has been eager to improve. [0003] The energy consumed in the circuit can be divided into static power consumption and dynamic power consumption. Among them, the static power consumption refers to the leakage current power consumption, which is the power consumption when the circuit state is stable, and its order of magnitude is very small. Dynamic power consumption refers to the power consumption of capacitor charging and disch...

AI Technical Summary

Problems solved by technology

[0005] During the CPU sleep state, if an external device has an access request to the CPU, the CPU must be woken up to a working state, which will cause a large power consumption; in addition, in some working states, such as performing DMA (Direct Memory Access, direct memory access) data transmission, within the CPU, only the corresponding data transmission components, such as the data bus, data memory, and data storage manager, are required for data transmission without the participation of other modules of the CPU. However, in the prior art, these do not The clock of the CPU module involved in the transmission work is normally turned on, which still consumes a lot of energy

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