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Receiving SPDIF audio with DM8168 McASP

Carl Blake
Expert 1160 points

Can the McASP interfaces on the DM8168/9 receive SPDIF audio or do you have to convert SPDIF to I2S?

The data sheet seems vague about this.  It definitely says you can transmit SPDIF audio, but I need to be able to receive SPDIF audio.

Carl

  • 0
    TI__Guru**** 170625 points

    Hi Carl,

    I think the DM816x TRM is clear about that, you can only transmit S/PDIF audio with McASP:

    Features of the McASP include:
    Glueless connection to audio analog-to-digital converters (ADC), digital-to-analog converters (DAC), codec, digital audio interface receiver (DIR), and S/PDIF transmit physical layer components.

    • Transmit section supports:
    – Wide variety of I2S and similar bit-stream formats.
    – TDM streams from 2 to 32 time slots.
    – S/PDIF, IEC60958-1, AES-3 formats.
    • Receive section supports:
    – Wide variety of I2S and similar bit-stream formats.
    – TDM streams from 2 to 32 time slots.
    – TDM stream of 384 time slots specifically designed for easy interface to external digital interface receiver (DIR) device transmitting DIR frames to McASP using the I2S protocol (one time slot for each DIR subframe).

    For S/PDIF reception, an external DIR integrated circuit should be used with I2S output format and connected to the McASP receive section. For example, see figures 14-2, 14-3 and 14-4.

    Regards,

    Pavel

  • 0 in reply to Pavel Botev
    Expert 1160 points

    Thank you for the confirmation.  I thought at first that if the 816x could handle S/PDIF output it should be able to handle S/PDIF input.  I'll have to add a DIR to my board.

    Carl