I use ad9910 , can generate the sin wave and the freq is correct.Now ,I use the 3-wire serial and want to the register for the adress (eg 0x00,0x02),but the SDO is low always.My step is
2)write data 32'h0000_0002 to the address 0x00 ( via SDIO) (seelct 3-wire )
3)write data 32'h1700_c400 to the address 0x02 (via SDIO)
4)write data 64'h08b5_0000_2000_0011 to the address 0x0E (via SDIO)
2)write the address 0x82 (for the address 0x02) to SDIO
3) read the SDO to buffer
the buffer is 32'h0000_0000, But the out wave is sin wave(12.5M) and is correct.
who can tell my error ,Thank you every much!