4 group I2S in adau1451 , only SDATA_IN0 works

Hello,

I am using ADAU1451,  there 4 audio sources,  AUX/SPDIF/USB/ WIFI.

AUXIN -->ADC-->SDATA_IN3   

USB (I2S)--> SDATA_IN2

WIFI(I2S)-->SDATA_IN0

SPDIF--> ASRC INPUT 0/1

Now , WIFI(I2S)-->SDATA_IN0  works,  

SPDIF--> ASRC INPUT 0/1  works

but  SDATA_IN2 / SDATA_IN3   no sound . which the BLCK/LRCK/DATA  tested by  AP , is fine.  but even in sigma 4.4 , use the level monitor  no signal  in at all.

donot know why.

Thanks 

Meican.

 

Parents
  • +1
    •  Analog Employees 
    on Nov 25, 2019 9:20 PM 10 months ago

    Hello Meican,

    This will be a master clocking issue most likely. 

    You did not specify what was a master for clocks and what is a slave. 

    You have three sources where it will be impossible to have them synchronous to the same master clock, so you will have to use the ASRCs for all three of them. 

    SPDIF (you already are using the ASRC on this one)

    WiFi

    USB.

    For the AUX in You have a choice. The ADC can be the master. If you are planning on using high sampling rates, like 192kHz or even 96kHz, you would be advised to have the ADC be the master. Then you can slave the entire DSP off of that clock rate. 

    Draw up a clocking diagram.

    Also, attach your project. It will answer a lot of questions.

    Dave T

  • Hi Dave

    i attached the simple project and sch diagram.

    1.  wifi   and spdif  works

    2. this project not update spdif setting 

    3.  wifi/ usb / adc source , all  are master , 1451  is slave  in all 3 input mode .

     now usb and adc  no work.

    my question is 

    A. why usb/ adc input no work?

    B .  for ASRC input( 16ch) , when we use   i2s port2( ch32/33),  can be use ASRC input ?  then hw to connect? donot understand the relation ASRC 16 CH input  and  i2sport0-4  .

    C    which  case has to be use ASRC input ?  which  case has to be use ASRC output ?

    D . Our application , USB(I2S MASTER)  to SDATA IN2,   need ot not need ASRC input ? if need , how to connect ASRC input .?

    Regards4_SOURCE.zipPDF

    Meican.

  • 0
    •  Analog Employees 
    on Nov 26, 2019 4:46 PM 10 months ago in reply to meican

    Hello Meican,

    According to your document. The master clock is only going to the DSP and the DAC. The USB has its own master clock and you do not show where the master clock is coming from for the ADC so I will assume it has its own source. 

    So with that said, I think it is best to have the DSP core and the DAC both synchronized off of the MCLK that is going to the DSP and the DAC. So you will not require an ASRC for the DAC at all. 

    So this means that you will need an ASRC for all the other inputs. That will be 8 channels so you have enough channels available. 

    So I will open up your project and make the changes and post them later.

    Dave T

Reply
  • 0
    •  Analog Employees 
    on Nov 26, 2019 4:46 PM 10 months ago in reply to meican

    Hello Meican,

    According to your document. The master clock is only going to the DSP and the DAC. The USB has its own master clock and you do not show where the master clock is coming from for the ADC so I will assume it has its own source. 

    So with that said, I think it is best to have the DSP core and the DAC both synchronized off of the MCLK that is going to the DSP and the DAC. So you will not require an ASRC for the DAC at all. 

    So this means that you will need an ASRC for all the other inputs. That will be 8 channels so you have enough channels available. 

    So I will open up your project and make the changes and post them later.

    Dave T

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