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DCM usage question
- 07-04-2003

Re: DCM usage question

Howdy Yu,
What exactly do you mean by the "clkfx de-skew" portion of your
question? Considering that there is no fixed phase relationship
between asynchronous clocks (like your 30 MHz and 40 MHz), what good
would the de-skew be?
If you post a more complete description of your application, it would
likely result in multiple responses, possibly each outlining a
different way to meet your requirements.
Good luck,
Marc

Re: DCM usage question
mrand@my-deja.com (Marc Randolph) wrote in message

Thanks for your suggestion.
Let me explain the situation.
When we use the DLL function of DCM. All DCM output clocks are
phase-aligned to CLK0 and, therefore, are also phase-aligned to the
input clock.
There's no problem if I only use one of the clkdv output or clkfx
output.
But now I want to use both the tow output clocks, can they still both
phase-aligned to clkin?
I've read the Xilinx answer record 12582, which sugest to use tow DCMs
in series. Though my application is a little different, and I'm
thinking how about using tow DCMs in parallel. Would there be any
improvement?

Thanks for your suggestion.
Let me explain the situation.
When we use the DLL function of DCM. All DCM output clocks are
phase-aligned to CLK0 and, therefore, are also phase-aligned to the
input clock.
There's no problem if I only use one of the clkdv output or clkfx
output.
But now I want to use both the tow output clocks, can they still both
phase-aligned to clkin?
I've read the Xilinx answer record 12582, which sugest to use tow DCMs
in series. Though my application is a little different, and I'm
thinking how about using tow DCMs in parallel. Would there be any
improvement?
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