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TLV320AIC3254EVM-U: The influence on audio quality when Synchmode enabled

Huang Cong Yao
Prodigy 30 points

Part Number: TLV320AIC3254EVM-U

Hi,

We use the framework AIC3254App8x4x. We have SynchMode enabled and our sampling rate is 44.1KHz.

We've found that using the SyncXfer with Synchmode enabled will decrease the audio quality, Could you identify the issue?

Thanks.

  • 0
    TI__Guru 57800 points

    Hi, Huang,

    If synchronous mode is used, you need to make sure that the clocking and instruction count of both miniDSPs is the same. I think the issue could be related to the cocking configuration of the device as the miniDSPS might be running with different clocks.

    For synchronous mode of operation, the following conditions needs to be satisfied:

    • IDAC = IADC = MDAC * DOSR = MADC * AOSR
    • NADC should not be powered up. MADC and other ADC related blocks should derive their clocks from NDAC. This is to ensure that the clocks for the two engines are derived from a common root. This can be realized by powering up NDAC and not powering up NADC. The following steps need to be completed before powering up NDAC.
      • Bit D7 of Register 60, Page 0 should be set to 1.
      • Values for NDAC, MADC, MDAC, IADC, IDAC, Interpolation in the miniDSP_D engine and Decimation in the miniDSP_A engine should be programmed.
      • MDAC (and MADC if MADC≠MDAC) should be powered up.
      • PLL (if being used for generation of codec clocks) should be powered up.
      • The ADC and DAC channels should be powered up.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Prodigy 30 points

    The further question is, the component syncXferA2D can accept multiple sets of input, but the output doesn't work properly, for more than 2 input situation, many of the output channel remains silent.

    Is it a bug on this component? Please help me, it's really important to our product development, thanks!