How to use the digital clock manager?

[madalin1990]

Ok!As the title sugest it i want to learn how to use the FPGA DCM!As far i have understood this DCM is used to adjust the default clock of the fpga to match your application needs.Correct me if i am wrong.
In my case i want to adjust the 50Mhz default frequency to 40 MHz.Can someone guide me in doing that?

 

[mrflibble]

Well, read the fpga datasheet for one, the part about Clocking Resources. Then install the tool du jour from xilinx/altera/whatever and do a pointy-clicky walkthrough of the DCM or PLL ip core. Other than that, multiply by 4, divide by 5 ... presto 40 Mhz.

 

[madalin1990]

I managed to do it using dcm.never again will bother with freq dividers))))