I tried to write to write a value to to some spi register and then read it by the spi interface at the AD9361 Reference Manual, with a verilog code but unfortunately the output of SPI_DO (4 wires) is always zero.
The SPI_clk I creat is 10MHz, I am using XILINX Spartan 6 without FMC carrier.
I have read the UG-570 many times ,but I can't work it out.
Can someone tell my what are the steps to do it right?
Am I missing something (some specific register to configure maybe) ?
Can you give me a Verilog code??