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AD9222 SPI

Question asked by dkline on Jun 24, 2011
Latest reply on Apr 1, 2014 by Jackson28428

Hello,

 

I'm having some trouble with using the AD9222 SPI. My setup is a folloows:

- I have an AD9222 evaluation board connected to an Altera Stratix-III development board. I designed an adapter board to interface

  between the AD9222 evaluation board HM-ZD connector and Altera's HSMC connector.

- I'm able to read all the addresses correctly listed (on pages 37-38) in the AD9222 datasheet. Meaning I can read the listed default values.

- I can write/read address 0x04 and 0x05 without any problems; however, when I try to write/read other addresses, the default value

  is returned and not the one I wrote. For example, I'll try and write 0x55 to address 0x19 (user_patt1_lsb). but will read 0x00 (default value).

 

  I've tried writing a 0x01 to address 0xFF (device update) but the default value is read back.

 

- Also, I can see the correct signals on an oscilloscope.

 

So, what am I doing wrong?

 

Please advise,thanks in advance.

 

Message was edited by: dkline

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