[SOLVED] internal and external CLK assigning to GCLK

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ahmadagha23

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Hi
I have 3 external clks and 2 internal clks. I want the ISE to assigne three GCLK-IOB and their related GCLKs (buffer) to external clocks and the remaining GCLK(buffer) to one of internal clks but in default ISE doesn't do that. How can I mange the implementation and assign of GCLK (bufg) to my required signals?
regards
 

HI,

by using constraint file you can do this.

HTH,
--
Shitansh Vaghela
 

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