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What is internal voltage 1.2V is it related to DAC?
Power supply of the FPGA bank should be same as ur DAC interface std.Suppose if the DAC interface is LVCMOS3V3 then you should connect 3V3 to FPGA bank supply... and regarding pin assignment FPGA pis are IOs so u can configure them as u want ....
DAC5662 IC is dual channel and working @ rate of 275 MSPS. First you have to taken care whether you are giving data(12 bit- samples) @ rate 275 MSPS. That you have to match with your source clock. Second you are going use dual channels.Then If you generate the data with respect to SELECTIQ, and WRTIQ, you can able to see the output.