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EVAL-AD9912 control by external FPGA

Question asked by JohnsonKu on Oct 24, 2017
Latest reply on Oct 28, 2017 by JohnsonKu

Hi

 

    I'm working on the project using this eval board as transmitter. Now, I meet a quite wired situation.  For example, when I send 3 byte word to the board from FPGA, the all registers always work from last word (i.e last word =0, the registers show 00 and if last word =1, the whole registers show FF).  It seems that the registers don't work.

 

Do I miss something to set up? 

 

Here it's my steps to send the data

1. CSB=0

    IO_UPDATE=0;

2.send two bytes instruction word plus one byte value for one by one bit

 

3. CSB=1;

    IO_UPDATE=1;

 

                                                                                      Sincerely 

                                                                                      Johnson

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