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drquinones
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Registered: ‎09-27-2008

DCM

How do I generate a 20Mhz clock and a 20Mhz clock phase shifted 180 deg from a differential 80Mhz clk input.  I've tried using several different combinations of the DCM from the Core Generator without success.  I understand from the other threads in the forum that cascading DCMs is not recommended (I wasn't able to get that to work either because of a bufg/ibufg conflict). 

 

 

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harsh.bandil
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Registered: ‎10-08-2008

You should use DCM in DFS mode. That would solve your purpose. No need for any cascading. As the input frequency is in low frequency range, so you can not use DCM for divide by 4 in DLL mode.
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