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Thanks for the quick reply. I am using the AD9910 DDS and it has parallel interface. So to have my DDS output frequencies really fast, I want to transfer the data in parallel. This might be asking for a bit much, but do you happen to know any examples that I can look at to interface a DDS with an FPGA. Thanks!
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The AD9910 does not look that different from the AD9956, it just has a higher operating frequency. Read through the documentation on this page;
https://www.ovro.caltech.edu/~dwh/carma_board/ specifically the AD9956 test report.
Cheers,
Dave