Clock switching circuit

Details Clock switching circuit Clock switching circuit

2006-05-16

2006-05-16

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

Having selection between plural continuous waveforms

C327S298000, C327S407000

Reexamination Certificate

active

07046047

ABSTRACT:
A clock switching circuit capable of preventing occurrence of hazards in an output clock signal at a time of clock switching, regardless of the frequency ratio of input clock signals. At a time of switching to a second input clock signal CLKIN_B from a first input clock signal CLKIN_A, the output of the first input clock signal is disabled based on an output signal of a first flip-flop group which takes in an inverted signal nSEL of a select signal SEL according to the first input clock signal CLKIN_A. In addition, the output of the second input clock signal CLKIN_B is resumed based on an output signal of a fourth flip-flop group which takes in an output signal from the first flip-flop group according to the second input clock signal CLKIN_B.

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