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Newbie pbaltz
Newbie
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Registered: ‎03-08-2019

XPS core config clock generator set M and D values

I'm using XPS version 14.7 to implment a microblaze desing on a Spartan 6 xc6slx45.

Using a 10MHz input clock, I need to generate a 4.096MHz clock for a timer.  Using the Spartan 6 DCM, I can't achieve exactly the required frequency but according to the Spartan-6 FPGA Clocking Resources User Guide both the DCM_SP and DCM_CLKGEN support M values of 22 and D values of 9.  These values would achieve an output clock of 4.090909090 MHz which is the nearest to 4.096MHz possible.

However, XPS core config doesn't allow me to specify M and D values directly, only an integer Required Frequency.  If I use 4090909 as the target then I get an error during sysnthesis that the requrested frequency is not avaialble.

I know I can get 4.09090 MHz if I can set the values of M and D, but don't see how that is possible.

How can I configure glock generator DCM M and D values in XPS?

Thanks,

-phil

 

 

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