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Is derived clock from FPGA DCM is best?

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satyakumar

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Hi all,
I have question related to using FPGA DCM for driving external memory like DDR SDRAM.

I am Implimenting a micro-controller in FPGA, it requires multiple clock for driving different interfaces.
And it has one large size external memory (DDR SDRAM), I want to drive the DDR by a clock derived from DCM. Is it best option? or I will generste clock from crystal which exactly matches the DDR clock frequency which I will use for accesing DDR, and hence I will derive the other clocks from DCM which are required by Micro-controlller. I.e the global clock runs with DDR clk frequency.

Which is best option? and how it impacts the syncronization etc.

Thanks in advance.
Regards
Satyakumar
 

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