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AM3352 - S/PDIF interface

Raja Ashutosh Kedia
Intellectual 430 points
Other Parts Discussed in Thread: AM3352

Hi,

I am working on a design of Optical Audio Output. I see that AM3352 processor supports S/PDIF output over AXR pin. Can I directly connect the AXR pin to TOSLINK connector or should I use a Transceiver/PHY/Driver? Is there any application note for S/PDIF interface?

Furher, is there any limitations of S/PDIF interface on AM3352? Also, is the S/PDIF linux driver provided by TI? 

Regards,

Raja

  • 0
    TI__Guru**** 161600 points

    Hi Raja,

    Here is what I can answer of your questions:

    Raja Ashutosh Kedia said:
    Can I directly connect the AXR pin to TOSLINK connector or should I use a Transceiver/PHY/Driver?

    I usually see the AXR pins of mcasp interface connected to audio codecs, so I think you should use some audio codec (transceiver/phy) for your application. 

    Raja Ashutosh Kedia said:
    Is there any application note for S/PDIF interface?

    Not that I know of. You can use the MCASP example provided here to get an idea on how to setup your mcasp driver. 

    Raja Ashutosh Kedia said:
    Also, is the S/PDIF linux driver provided by TI? 

     

    Yes, the davinci-mcasp.c driver provided in linux sdk supports S/PDIF protocol. You have to set the op-mode in your dts file to 1 in order to use the S/PDIF. 

    Best Regardds, 
    Yordan

  • 0 in reply to Yordan Kovachev
    TI__Guru**** 393215 points
    Hi Raja,

    Regarding the hardware connection: TOSLINK is an optical interface, so you will need a driver IC before it. There are integrated driver/connector solutions, e.g. TOTX141P from Toshiba.
  • 0 in reply to Biser Gatchev-XID
    Intellectual 430 points
    Dear Biser,

    Thanks for the quick response. We are planning to use the integrated driver/connector solution, which converts the electrical signal to optical signal. As per my understanding, in this case, we can directly connect the Processor's AXR pin to TOSLINK Connector. Please confirm.

    Thanks and Regards,
    Raja
  • 0 in reply to Raja Ashutosh Kedia
    TI__Guru**** 393215 points
    Yes, as long as they are electrically compatible, i.e. you should check that voltage levels and current requirements match.