Hardware-programmable clock switching method, device and system

Abstract

The invention discloses a hardware-programmable clock switching method, device and system. The method is applied to a processor. The method comprises the steps of obtaining a plurality of clock switching conditions generated by a register according to a preset clock switching condition rule and configuration, based on the validity information of each clock switching condition and the priority of each clock switching condition, determining a clock switching result of the plurality of input clock signals, and outputting the clock switching result to a clock selector, so as to realize clock switching among the plurality of input clock signals to obtain an output clock signal. The clock switching condition rule comprises a same priority identification field, a forced output identification field, a current output identification field and an input effective configuration output identification field. According to the invention, a plurality of clock switching conditions are configured and generated in the register, and the processor determines the clock output signal based on the plurality of clock switching conditions, thereby achieving the flexible and quick switching of the clock signalthrough hardware programming, and guaranteeing the precision of the clock signal.

Description

technical field [0001] The present invention relates to the technical field of electronic circuits, and more particularly, to a hardware programmable clock switching method, device and system. Background technique [0002] At present, the multi-frequency clock technology is widely used in chips, especially in the field of communication, and the chip usually adopts the multi-frequency clock technology for clock switching during operation. [0003] In the prior art, the clock switching mainly adopts the following two methods: (1) The clock switching with specific and limited conditions is realized through a hardware circuit. The clock switching speed of this method is fast, but it is not flexible, and only some specific conditions, simple conditions and Simple priority clock switching; (2) Realize complex and diverse clock switching through software coding. This method is flexible and can realize clock switching with various conditions and priorities, but the clock switching s...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, clock switching mainly adopts the following two methods: (1) Clock switching with specific and limited conditions is realized through hardware circuits. Clock switching of simple priority; (2) Clock switching of complex and diverse conditions is realized through software coding. This method is flexible and can realize clock switching of various conditions and priorities, but the clock switching speed is slow

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