Switchable clock source

Details Switchable clock source Switchable clock source

2006-01-03

2006-01-03

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

Having selection between plural continuous waveforms

C327S298000

Reexamination Certificate

active

06982573

ABSTRACT:
A clock source selector for selecting either a first clock signal A or a second clock signal B in accordance with a switch request signal includes three retiming circuits each consisting of two clocked flip-flops. The switch request signal is first retimed relative to clock A to give a signal P, is then retimed relative to clock B to give a signal Q, and finally is retimed relative to clock A to give a signal R. Selector circuitry operates such that when signal Q is asserted, the second clock signal B is output, when neither signal P nor signal R, as combined by a NOR gate, are asserted, the first clock signal A is output, and at other times a zero level is output. The clock source selector can be used in an integrated circuit to form a glitch-free multiplexer.

REFERENCES:
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patent: 5502409 (1996-03-01), Schnizlein et al.
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patent: 6239626 (2001-05-01), Chesavage
patent: 6472909 (2002-10-01), Young
patent: 6633991 (2003-10-01), Goldrian
patent: 0 969 350 (2000-01-01), None

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