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TDM Channel Configuration

Category: Software
Product Number: AD2428
Software Version: SS+ 2.1

Hello!


I have a question regarding the TDM interface of the AD2428. I would like to transmit 8 channels of TDM from peripheral ADCs on a subnode plus 4 channels of TDm from PDM mics, also connected to the subnode. The mainnode recieves these signals and outputs them with TDM16 to a ADAU1467 DSP. Transmission works but even though I set up the peripheral ADCs to occupy tdm slots 0-7, the signals end up in all kinds of slots in SS+. Is there a way to configure the a²b transmission in a way that the slots are occupied AT LEAST consistently?

Thanks,

Sebastian

  • I can define the streams in the stream configuration and assign them. The problem is I don't see any way of assigning the streams to data recieved at DRX0/DRX1 or ALTRX(DTX1(IO4).

  • Look, the example project you refered to does not help, because I don't know what to look for. The wiki page you refered to does not help, because it does not say anything about how to link a signal on a pin to a stream. I cannot resolve the missing link betweet the data on the TX1 pin (TDM8) and the corresponding stream, that i defined. Same goes for the PDM signals on RX0 and RX1. I read the documentation, read the wiki, the help pages and asked here. And I have to say, all three of these resources don't seem to be particularly helpful.

  • Hi Sebastian,

    Since this is the same issue you´ve reached out to me about via email, let´s continue to discussion that way. We can post the outcome here. This way, there won´t be multiple engineers working on the same technical request. Thanks for your understanding!

    I´ll reach out to you with a response before the end of the day.

    Best regards,

    Maikel 

  • Hi Maikel,
    thanks! Do you mean I have to add a Non Programmable Generic device for each PDM microphone? I did that and for now it seems to be working as expected. However, I don't quite understand why. How does the AD2428 know, that the four generic devices represent PDM mics and the other two ADCs? I mean, I connect all of them to the RX "Pin" in SS+, but that isn't really a pin is it? I would think that the slots in the stream configuration should be linked somehow to the pins on the AD2428.

  • This request is being handled via private email.