Control method and apparatus and functional board

Abstract

Embodiments of the invention provide a control method and apparatus and a functional board. The control method is used for controlling a clock output unit, wherein the clock output unit is used for providing a clock signal for a function expansion module inserted in the functional board. The control method comprises: when the functional board is powered on, detecting whether a first function expansion module inserted in the functional board exists; when detecting that the first function expansion module exists, performing first control operation to ensure that the clock output unit outputs a first clock signal to the first function expansion module, and the first function expansion module can work normally; and when detecting that the first function expansion module does not exist, performing second control operation, and switching off the clock output unit. According to the embodiments of the invention, unnecessary power consumption is avoided.

Description

technical field [0001] The invention relates to the field of clock control, in particular to a control method, device and function board. Background technique [0002] At present, in order to meet the needs of different customers, manufacturers of Ethernet communication equipment strive to launch products with diversified functions and modularization to enhance the market competitiveness and adaptability of products. Users can purchase corresponding function expansion modules according to their needs. Different function expansion modules need to be inserted on the main function board to be used. [0003] For the clock processing scheme of the function expansion module, there are three commonly used technical means as follows: [0004] 1. There is a multi-output clock generation chip on the main function board, which provides the reference clock required by each module circuit of the device. For the clock requirements of different function expansion modules, corresponding ...

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Problems solved by technology

[0008] 1. When the function expansion module is not inserted, the corresponding clock pins of the multi-output clock chip on the main function board have output, which not only causes waste of power, but also high-frequency clocks will also affect the EMI (electromagnetic interference, Electromagnetic Interference, Electromagnetic Interference, Electromagnetic Interference) of the product. -MagneticInterference) performance

[0009] 2. Even if the function expansion module 1 is inserted, the clock pin reserved for the function expansion module 2 in the same slot of the function board is suspended, which will also cause waste of power and pin resources, and the clock that is not turned off will generate radiation Affect the EMI performance of the product

The above problems 1 and 2 can be solved by using the local clock, but this solution will not only cause waste of multiple output clock chip resources on the main function board but also increase the cost of the product

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