Clock switch for generation of multi-frequency clock signal

Details Clock switch for generation of multi-frequency clock signal Clock switch for generation of multi-frequency clock signal

2007-05-15

2008-12-30

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

Having selection between plural continuous waveforms

C327S407000, C327S408000

Reexamination Certificate

active

07471120

ABSTRACT:
An improved clock switch in an integrated circuit chip that multiplexes two asynchronous clock signals to generate a multi-frequency clock signal in a manner that avoids glitches on the clock output line and meta-stable states within the switch. The clock switch does not include a cross-coupled feedback loop, thus rendering the clock switch test-friendly and avoiding potential race conditions in the switch. The clock switch is useable with asynchronous clock sources having a variety of different clock frequencies and phases.

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R. Mahmud, “Techniques to Make Clock Switching Glitch Free”, EE Times, Jun. 26, 2003 (downloaded from http://www.eetimes.com on May 15, 2007).

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