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Clock switching method and clock switching device

A clock switching and clock technology, applied in the field of communication, can solve problems such as clock signal instability, selection signal instability, etc., to achieve the effect of ensuring a stable state

Inactive Publication Date: 2016-10-05
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this solution has at least the following disadvantages: in the case where the system needs to switch between two or more clocks, the selection signal may be in an unstable state during the switching process, which will cause instability of the clock signal

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  • Clock switching method and clock switching device
  • Clock switching method and clock switching device
  • Clock switching method and clock switching device

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Embodiment Construction

[0051] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0052] The present invention provides a method for clock switching, referring to figure 1 , in one embodiment, the method for clock switching includes the following steps:

[0053] Step S101, receiving a selection instruction, and acquiring a selection signal value;

[0054] Step S102, when the selected signal value is the first preset value, gating the first clock;

[0055] In this preferred embodiment, when the clock switching device receives the selection instruction, it will acquire the corresponding selection signal value. The first clock is clk_0, and the second clock is clk_1. The first default value is 0, and the second default value is 1. When the selection signal value Select is 0, clk_0 is selected, and when the selection signal value Select is 1, clk_1 is selected. Of course, in other embodiments, clk...

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PUM

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Abstract

The invention discloses a clock switching method. The clock switching method comprises the steps of: receiving a selection instruction, and acquiring a selection signal value; if the selection signal value is a first preset value, then gating a first clock; receiving a switching signal transmitted by a second clock; determining a logic or operation result of the first clock and the second clock; and switching to gate the second clock or controlling the first clock to perform a complete clock cycle according to the logic or operation result. The invention further discloses a clock switching device. The clock switching method and the clock switching device can reduce the probability of an output clock undergoing a narrow wave pulse phenomenon when the selection signal is switched randomly.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a clock switching method and a clock switching device. Background technique [0002] In integrated circuits, it is often necessary to adjust the working clock frequency of the system according to different working scenarios. The existing scheme usually uses a multi-choice selector to determine the gated clock according to the number of the input selector, and It is entered into the system. However, this solution has at least the following disadvantages: when the system needs to switch between two or more clocks, the selection signal may be in an unstable state during the switching process, which will cause instability of the clock signal. [0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not mean that the above content is admitted as prior art. Contents of the invention [0004] The main...

Claims

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Application Information

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IPC IPC(8): H03K5/05
CPCH03K5/05H03L7/00
Inventor 文显琼赵恒正
Owner ZTE CORP