Method and system for accurately outputting pulse number in clock domain crossing manner

Abstract

The invention discloses a method and a system for accurately outputting a pulse number in a clock domain crossing manner. The method comprises the steps of receiving a feature signal sent by a control end and a data bus signal sent in the same time as the feature signal, generating an enable signal en when receiving the feature signal each time, extracting a pulse number N from the data bus signal at the same time, calculating a time interval Cn of a current enable signal and a previous enable signal by a clock of an execution end, generating a trigger signal flag after a predetermined time delay T, and outputting the trigger signal flag; receiving the current enable signal, the pulse number N and the time interval Cn, dividing Cn by N under the triggering effect of the current enable signal to obtain a remainder R and a quotient Q, and outputting the remainder R and the quotient Q; and receiving the trigger signal flag, the remainder R and the quotient Q, obtaining the pulse widths of pulses by the remainder R and the quotient Q under the triggering effect of the trigger signal flag, and outputting N pulses with corresponding pulse widths. According to the method and the system, the execution end and the control end can be kept synchronous under the condition that the clock has different sources.

Description

technical field [0001] The invention belongs to the technical field of clock control, and more specifically relates to a method and system for accurately outputting pulse numbers across clock domains. Background technique [0002] In industrial applications, due to functional design requirements, many control-end devices and execution-end devices do not use the same source clock. Although the controller sends characteristic signals and control commands to the execution end in a certain period, different source clocks still cause the control end. Errors on the clock and execution sides add up, causing serious synchronization problems on both sides. Contents of the invention [0003] In view of the above defects or improvement needs of the prior art, the present invention provides a method and system for accurately outputting pulse numbers across clock domains. Solve the technical problem of the wrong number of pulses output by the execution end caused by the accumulation o...

AI Technical Summary

Problems solved by technology

[0002] In industrial applications, due to functional design requirements, many control-end devices and execution-end devices do not use the same source clock. Although the controller sends characteristic signals and control commands to the execution end in a certain period, different source clocks still cause the control end. The errors of the clock and the execution end accumulate, causing serious synchronization problems at both ends

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