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JLee25's avatar
JLee25
Icon for Contributor rankContributor
6 years ago

VIP Suit Switch II Ready Signal

Hello, I am working on a simple project that with CVI/ PTG -> Switch -> CVO -> HDMI at 1080p. Sometimes the CVO is not outputting any signal from PTG. From Signal Tap, I noticed for CVO or S...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
6 years ago

By the way, to ease the debugging, probably you can use two TPG with different video patterns since there is no valid video input to the CVI.

  • JLee25's avatar
    JLee25
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    6 years ago

    Hi CP,

    Here's the configuration and steps,

    1. Set CVO to "GO" and clear underflow.
    2. Set CVI to "GO"
    3. Config PTG as 1080p then "GO"
    4. Config Switch, input source from PTG. din_0 and din_1 as consume mode
    5. Write Switch address 0 to 0, stop the switch.
    6. Keep reading Switch Status till it's 0.
    7. Set Swithc to Go.

    Here's the result,

    Download Nios and repeat above procedures,

    At Step 6, Nios kept reporting Status as 1. And not response to any configuration.

    Captured Signals like below,

    And thanks for the suggestion,

    I am working on a new VIP, with 2 switches and 2 PTGs.

    CVI and PTG_0 go to Switch_0. Switch_0 out to frame buffer.

    FB and PTG_1 go to Switch_1. Output of Switch_1 to CVO.

    PTGs are of different pattern.

    BRs,

    Johnson

    • JLee25's avatar
      JLee25
      Icon for Contributor rankContributor
      6 years ago

      Hi CheePin,

      The new configuration shown similar problem, when I catch signals like below.

      Firmware always returns Status as 1, updating to Switch is not applicable.

      dout_0_ready came from frame buffer, it switched to low when switch is "GO".

      Any comments?

      Regards.

      Johnson

    • JLee25's avatar
      JLee25
      Icon for Contributor rankContributor
      6 years ago

      Hi Chee Pin,

      I think the problem is the memory controller.

      I find the frame buffer ready signal was gone after "GO" for a short period.

      Then I get the memory signal and noticed that the local_cal_fail raised.

      This explains why the frame buffer will turn to not ready when switch is "GO".

      Any suggestion on how could I debug this?

      Please comment.

      Thank you!

      BRs,

      Johnson