question about dac_valid_i0 and dac_enable_i0

Hi FPGA experts:

   I am using AD9361 ip core in my custom board. I debug the signals about ad9361 when tx pkg. The behavior of dac_valid_i0 and dac_enable_i0 seems strange. They always be 1:

Could you give some advice about what is going wrong?
Thanks

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