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Altera_Forum's avatar
Altera_Forum
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13 years ago

aud_ws_in signal in SDI audio extractor

Hi

The aud_ws_in signal in SDI audio extractor is used as a reference word select signal to align the serial outputs of multiple audio extractors.

(please see SDI use guide for the original description).

So, I expect to see aligned serial audio data if I connect a clock of 48KHz to the aud_ws_in of several audio extractors.

(My bit clock for the audio is 3.072MHz)

However, when I really do this, I don't think I have seen seen aligned serial audio data from signaltapII. Please see the attached siganltapII waveform.

The embedded audio data in SDI are all 1KHz tone from a test pattern generator. So their serial data should be the same. All I need is to align data between multiple audio extractors. Should I add FIFO to do this?

Does anyone have some suggestions about my question? Thanks.

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    Hi, Aphraton

    I eventually find the signal "aud_ws_in" can do the work for me.

    You may see the SDI user guide to understand how to use it.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    --- Quote Start ---

    Hi, Aphraton

    I eventually find the signal "aud_ws_in" can do the work for me.

    You may see the SDI user guide to understand how to use it.

    --- Quote End ---

    Yes, I understand how to use signal "aud_ws_in".

    But You reported, that You had problems - output data not being aligned as seen in Your SignalTap screenshot.

    How did You solve output data not being aligned?