AD7763 Filter Download Question

Hi,

 

I am having problems downloading filters to the AD7763. I have tried the example in the datasheet (in Table 16) so that I know the checksum is correct but I am not getting the FILTER_OK or DL_OK bits set in the Status read (the other bits of the Status read are fine - and UFILTER is set).

 

I am convinced that I have no problems with the data timing and I have a good clean clock, frame sync and data. I am clocking at 12.8 MHz.

 

I would be grateful for answers to the following questions:

 

1. Are there are any errors or omissions in the datasheet with respect to the download?

2. Is there any difference between the effects of applying a hardware SYNC (via the SYNC pin) or writing to the SYNC bit in Control Register 1?

3. In Table 16 it is not clear whether the delay for the checksum should be before or after writing the checksum, could you clarify this please?

 

Many thanks,

 

Gary Moore

Parents
  • Hi Gary,

    I have exactly the same problem as you.

    I want to download a fir to the AD7763. I try to download a complete FIR without success.

    So, I test the example in the datasheet (table 16) and I have the same results than you (filter_ok and dl_ok are not set).

    I have tried more than 20 tests with/without delay between coeff/checksum, etc and it doesn't work.

    nOw, I have no idea to resolve this critical issue.

    Did you find a solution ?

    It would be great if somebody can answer quickly.

    Thanks a lot for any response.

    François

Reply
  • Hi Gary,

    I have exactly the same problem as you.

    I want to download a fir to the AD7763. I try to download a complete FIR without success.

    So, I test the example in the datasheet (table 16) and I have the same results than you (filter_ok and dl_ok are not set).

    I have tried more than 20 tests with/without delay between coeff/checksum, etc and it doesn't work.

    nOw, I have no idea to resolve this critical issue.

    Did you find a solution ?

    It would be great if somebody can answer quickly.

    Thanks a lot for any response.

    François

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