[SOLVED] How to work around this:DCM requiring clock capable IOB

[linmalth]

[solved]How to work around this:DCM requiring clock capable IOB

Hi,there
Recently I encountered a problem on virtex6. Our main oscillator has jitter so we use another ext oscillator instead. Inside our design there is a DCM generated by clock wizard, but there is no convenient clock capable IO left. If I link a regular IO to DCM input, it will report error, says require a clock capable IOB. And I already set clock_dedicate_route to false.
Anyone know how to work around? I would thank your generous help.

 

[mrflibble]

What you can try is take input from your regular non-clock IOB, then use that as the input to a BUFG primitive. And then use the output of that BUFG primitive as input to your DCM module. You may have to regenerate your DCM core. More specifically, you´ll need to disable the input buffer because you are providing your own.

And you´ll need to keep that clock_dedicate_route to false thing.

Hope that helps...

 

[linmalth]

Oh, thanks. I tried your way and passed par.
In fact, I just re-gen the DCM using "global buf" option, and the job is done.

 

[mrflibble]

Glad it works.