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Running aic3254 in master mode

metusa
Intellectual 480 points

 Hi all,

 I'm trying to run aic3254 for different sampling rates in master mode. When I loopback it without minidsp it runs ok, but when I compile it in PPS (minidsp active) only 8khz sf works correctly. Is it due to minidsp (clock) limitations?

Thanks

  • 0
    TI__Guru**** 189401 points

    Metusa,

    Some functions only work at 8 kHz sampling.

    Can you describe exactly what you're trying to do, and the results you're getting?

    -d2

  • 0 in reply to Don Dapkus
    Intellectual 480 points

    Hi Don,

    Thanks for quick replying. I try to use AGC and NR utility of miniDSP. I use evm5505 board. Firstly, I used codec in slave mode and it run perfectly at any samling frequency. But when in master mode only 8khz sampling rate is ok. Even I loopback, I hear only noise for sampling frequency higher than 8.  This is my trial in aic3254 master mode:

    1- Loopback with minidsp active. Result is ok only for 8.

    2- Loopback without minidsp. Works ok at any sr.

    Thanks

  • 0 in reply to metusa
    TI__Mastermind 46195 points

    Hello,

    You need to make sure that the whole clock tree is configured properly. For instance, when doing 16ksps, you need to make sure to re-adjust the BCLK divider to ensure that there are at least 32 (or 64 for 32 bit or...) BCLK cycles per WCLK. Take a look at the Design and Configuration Guide app note to make sure you have everything set up correctly for PLL settings as well. For instance, MDAC*DOSR >= IDAC, etc.

    Regards,

    J-

     

  • 0 in reply to J-
    Intellectual 480 points

    Hi,

    Ok. Now it works. I didn't notice that, because I havent seen any constraint about DOSR and IDAC neither in 3254 datasheet nor in configuration guide.

    Thanks for all