Single-port mode of dual DAC

Question

I have a question about single-port mode of dual DAC. Could you show me the answer of following problem. 
 
 For example AD9741,AD9743,AD9745,AD9746,AD9747, In the case of using these dual DACs with single-port mode and only DAC1, how should I do IQSEL pin ? 
 
 1. Open with setting ONEPORT = 0 That is, as we select dual-port mode, the IQSEL input is ignored. 2. Connect it to VDD Always DAC1 is selected. 3. I/Q frame signal of FPGA 4. Other 
 
 I am waiting for your reply. 
 
 Best regards,

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Single-port mode of dual DAC