Clock regeneration method taking standard clock/data as reference

Abstract

The invention discloses a clock regeneration method taking a standard clock / data as reference, which comprises the following steps of: generating a regeneration clock by a local high-speed processing clock, setting an expected phase for the regeneration clock, tracking and compensating the error phase between the current phase and the expected phase for the regeneration clock, and continually adjusting the phase of the regeneration clock output by the local high-speed processing clock according to the compensating result. The invention has the advantages of providing a new clock regeneration method, solving the problem that clock regeneration cannot be performed due to non-uniform duty ratio of reference signals, strictly ensuring a phase relationship between the reference input and the regeneration clock without relating with relative frequency deviation, ensuring the accuracy of the regenerative data and the reliability of link transmission and setting the relative phases of the regeneration clock and the input reference.

Description

technical field [0001] The invention relates to a communication technology, in particular to a clock regeneration method with clock / data as a reference. Background technique [0002] In the field of communication, some interfaces only transmit data signals, and interfaces do not include clock signals, such as HDB3 codes, clock information is transmitted through data; some interfaces transmit data signals and clock signals at the same time, such as B interface, clock information is directly transmitted through clock signals Transmission; on various interfaces, the data often has a certain amount of jitter when it is interfered by external signals, and the interface circuit needs to be processed by an analog circuit, which will cause the duty cycle of the reference signal to be uneven, so it is necessary to perform clock regeneration on the interface circuit. For data recovery and subsequent processing. [0003] Therefore, the goal of clock regeneration is to use the referenc...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems existing in the prior art that the duty ratio of the reference clock (data) is high, the relative phase of the regenerated clock and the input reference changes with the frequency offset, and the phase accuracy of the regenerated clock is poor, the present invention proposes a method based on Clock / data as a reference clock regeneration method, the regeneration clock is generated by the local high-speed processing clock, the expected phase is set for the regeneration clock (the expected phase refers to the relative phase between the reference input and the regeneration clock), and the current phase of the regeneration clock is compared with the expectation The error phase between the phases is tracked and compensated, and the regenerated clock output by the local high-speed processing clock is constantly adjusted according to the compensation result

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