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TOPIC: TDM input and output data offsets.

TDM input and output data offsets. 1 year 11 months ago #40794

  • pfitchen
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Hi!

I've been using the USBStreamer to record data from an array of microphones and also playback my recordings to an amplifier and speaker. I noticed that the output TDM waveform has a data offset of 2 SCLKs (BCLKs) from the Frame Sync (LRCLK) signal. I can compensate for this shift in my amplifier, but I can't change the offset that my microphones are producing. They have an offset of only 1 SCLK for their data bits.

I've been using the USBStreamer_Up_TDM16_v6_ID10.bin firmware. Could anyone clarify what offset it is expecting on an input TDM signal? Also is it possible to change this offset? I believe it's the tdm_config_t:offset parameter on the XMOS chip.

I greatly appreciate the help!
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TDM input and output data offsets. 1 year 10 months ago #41095

  • devteam
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@pfitchen

I believe that we've already talked of this on a support ticket and already solved? Feel free to contact us if any questions.
The TDM diagram should be as per here. It's the right offset.




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TDM input and output data offsets. 1 year 10 months ago #41137

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Yes, this has been resolved. Thank you!
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