A hardware programmable clock switching method, device and system

Abstract

The invention discloses a hardware programmable clock switching method, device and system. A processor obtains a register according to preset clock switching condition rules, configures a plurality of generated clock switching conditions, and determines whether each clock switching condition is valid or not. information, and the priority of each clock switching condition, determine the clock switching results for multiple input clock signals, and output the clock switching results to the clock selector, so as to realize the clock switching from multiple input clock signals to obtain the output clock signal . The clock switching condition rule includes: the same priority identification field, the mandatory output identification field, the current output identification field, and the input valid configuration output identification field. The invention generates multiple clock switching conditions in the register configuration, and the processor determines the clock output signal based on the multiple clock switching conditions, thereby realizing flexible and fast switching of the clock signal through hardware programmability, and ensuring the accuracy of the clock signal.

Description

technical field [0001] The present invention relates to the technical field of electronic circuits, and more specifically, 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 communication field, and the chip usually uses the multi-frequency clock technology for clock switching during operation. [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 relatively slow. [0004] Therefore, how to provide a clock switching method to realize flexible and fast switching o...

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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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