We are using 3-wire mode as standard and reconfigured the CSR reg 0x00 by writing 0xF2 value.
However we don't see any response from the Eval board.
We found a 1kOhm resistor to GND on EvalBoard. We have on our
test card a pull up resistor (2.61kOm to 3.3V). That explains the value of
SDIO_2. But this should not have an influence.
Normally on SPI Bus pull up is used.
There is no reaction of AD9959.
We also triggered the SYNC_I/O with no success.
Can you give us a hint?