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Test the TDM function on TAS5825M EVM

Axl Lee
Prodigy 210 points

Other Parts Discussed in Thread: TAS5825M

I want to test the TDM function on TAS5825M EVM.

Because the biggest difference between TDM and I2S is that TDM can transmit more than 2 channels, so I want to test the transmission of 4 channels.

There are 2 TAS5825M ICs on the EVM, a total of 4 channels.

If I input 4-channel TDM stream from PSIA interface by AP, and then switch the data format from I2S to TDM/DSP, where is the default output interface?

Besides DATA_FORMAT register, are there other registers that must be set together?

Can PPC3 control EVM to play 4-channel TDM?

Or is there a better method to test the TDM function on EVM?

  • 0
    TI__Expert 6280 points

    Hi Axl.

    I will reply you later.

    BR.

    Wei Qiu.

  • +1 in reply to Wei Qiu
    TI__Expert 6280 points

    Hi Axl.

    Sorry for replying you late.

    where is the default output interface?

    A: Do you mean the output interface of AP? If it is, the interfaces are the same as I2S, LRCLK/SCLK/SDIN.

    Besides DATA_FORMAT register, are there other registers that must be set together?

    A: Yes, it need set more registers, for example, if you want to use two devices 4 channels, you can input the code below:

    #Chip A

    w 98 00 00

    w 98 7f 00 # book0 page0

    w 98 33 13 # TDM 32bit

    w 98 34 01 # shift one SCLK/ if the AP set shift left

    #Chip B

    w 9a 00 00

    w 9a 7f 00 # book0 page0

    w 9a 33 13 # TDM 32bit

    w 9a 34 41 # shift 65(32*4/2+1) SCLKs/ if the AP set shift left

    Or is there a better method to test the TDM function on EVM?

    A: You can set four channels of different gains to confirm the TDM function is successfully.

    BR.

    Wei Qiu.

  • 0 in reply to Wei Qiu
    Prodigy 210 points

    Hi Wei,

    Thanks for the reply.

    Due to this question doesn't specify the Part Number, I thought you would not receive it (and I didn't get an email notification either), so I asked the same question again in

    https://e2e.ti.com/support/audio-group/audio/f/audio-forum/1121379/tas5825m-test-the-tdm-function-on-tas5825m-evm

    That's very sorry. Can you help me to delete one of them?

    Sincerely,

    Axl

  • 0 in reply to Axl Lee
    TI__Expert 6280 points

    Hi Axl.

    I will close your other same posts.

    BR.

    Wei Qiu

  • 0 in reply to Wei Qiu
    Prodigy 210 points

    Hi Wei,

    It works now and well.

    Thanks a lot!

    Sincerely,

    Axl

  • 0 in reply to Wei Qiu
    Prodigy 210 points

    Hi Wei,

    Now the 4-channel TDM can be output from the 4 SPK_OUT ports of EVB, but there is still a problem, when the Sampling Rate that output by AP is 32k~48k, the sound output from SPK_OUT are normal, but when Sampling Rate is greater than 48k (including 96k and 192k), SPK_OUT is no sound.

    Is there any other register that needs to set?

    Sincerely,

    Axl

  • 0 in reply to Axl Lee
    TI__Expert 6280 points

    Hi Axl.

    You can set the EVM board like below:

    Wei Qiu said:

    #Chip A

    w 98 00 00

    w 98 7f 00 # book0 page0

    w 98 33 13 # TDM 32bit

    w 98 34 01 # shift one SCLK/ if the AP set shift left

    #Chip B

    w 9a 00 00

    w 9a 7f 00 # book0 page0

    w 9a 33 13 # TDM 32bit

    w 9a 34 41 # shift 65(32*4/2+1) SCLKs/ if the AP set shift left

    And then you can configure the AP software like below to have a try:

    BR.

    Wei Qiu.

  • 0 in reply to Wei Qiu
    Prodigy 210 points

    Hi Wei,

    I tried again and the situation was the same as before, while the output SR of the AP exceeds 48k, the SPK_OUT will go from normal to no signal.

    At this time, the TAS5825M has not made any changes, the only change is the output SR of AP.

    Sincerely,

    Axl

  • +1 in reply to Axl Lee
    TI__Expert 6280 points

    Hi Axl.

    Sorry for replying you late.

    You can choose this process flow;

    And use this configuration of AP software to have a try again:

    Frame pulse choose one subframe or 50% duty cycle.

    BR.

    Wei Qiu.

  • 0 in reply to Wei Qiu
    Prodigy 210 points

    Hi Wei,

    It works!! Thank you very much!!

    But I wonder what the process flow "2 band DRC & AGL" did？

    Can I set registers manually to achieve the same purpose?

    Sincerely,

    Axl

  • +1 in reply to Axl Lee
    TI__Expert 6280 points

    Hi Axl.

    You can configure the device by the code below;

    #Chip A
    w 98 00 00
    w 98 7f 00 # book0 page0
    W 98 01 11 # reset
    d 20
    w 98 33 13 # TDM 32bit
    w 98 34 01 # shift one SCLK/ if the AP set shift left
    w 98 46 11
    w 98 78 80 # clear fault bit
    w 98 03 03 # enter play

    #Chip B
    w 9a 00 00
    w 9a 7f 00 # book0 page0
    W 9a 01 11 # reset
    d 20
    w 9a 33 13 # TDM 32bit
    w 9a 34 41 # shift one SCLK/ if the AP set shift left
    w 9a 46 11
    w 9a 78 80 # clear fault bit
    w 9a 03 03 # enter play

    BR,

    Wei Qiu.