Asynchronous clock switching circuits vs. BUFGMUX

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Hi Peter,

I've used your Asynchronous clock switching circuits(Six Easy Pieces) in my
design. It works really good.

What I'm wondering is whether there's the same circuits in the BUFGMUX. Any

Re: Asynchronous clock switching circuits vs. BUFGMUX
Unfortunately, there is a difference. The BUFGMUX has a set-up time
requirement for S, so it is not really asynchronous.
Both types of circuit have a common flaw: They do not work properly with
a clock of zero frequency...
For that you have to use the Enable option.
This is all being fixed in the next generation.

Peter Alfke
Jay wrote:
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