I am looking to control AD9959 manually via FPGA. I can see the register address/map given in datasheet for controlling but I cant find information about how do I access them? Which pins of U2 AND U13 corresponds to which register/bit?
If I wish to change frequency tuning then how do I access corresponding register and its bits?
Regarding external control on eval boards, I recommend you read first this FAQ: What are the basic things to be checked when using the DDS evaluation board via external control?
Then, you can refer to the schematic of the AD9959 eval board for the data lines. The data lines are CSB, SCLK and SDIO lines. IO_UPDATE is also important to transfer all data from the buffered register to the active register.
Please let me know once you already figured out the hardware side on external control.
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