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AM5728: Pinmux Tool voltage conflict question

Brad Caldwell
Genius 12595 points
Part Number: AM5728


Hi,

We're using the Cloud version (version 4 I think) of the TI pin mux tool for the AM5728 (AM5728_SR2.0). When I add HDMI, I get voltage conflict warnings. I need to know if this is a real issue with our design or just a tool artifact.

Here's a screenshot of the pin mux tool showing the warnings.

The HDMI pins supplied by vdda_hdmi are all fixed at 1.8V by spec so in the Preferred Voltage setting in the pin mux tool, I set it to 1.8V, otherwise I get voltage conflict warnings about the HDMI pins supplied by vdda_hdmi being at 3.3V. However, by setting Preferred Voltage to 1.8V, I now get voltage conflict warnings regarding the other HDMI pins that are powered by vddshv3 which is set to 3.3V. I can't change vddshv3 to 1.V because it has so may other pins on that power group that need to be 3.3V.

It seems to me, even though the HDMI pins that are powered by vdda_hdmi are at 1.8V, that I should still be able to power the other HDMI pins powered by vddshv3 at 3.3V. The tools indicates this is a conflict.

What I need is to know if this is a real voltage conflict in our design or just a tool nuance.

Thanks

  • 0
    TI__Guru**** 393215 points
    The Pinmux Tool team have been notified. They will respond here.
  • 0
    TI__Genius 13770 points

    Hi Brad,

    You may ignore this particular warning. It's a bug in the tool. We are looking into it in will be fixed in future versions. Please follow voltage domain configuration as suggested in the Data Manual.

    Hope it helps,

    Thanks,

    Alex

  • 0 in reply to Alex Bashkov
    TI__Genius 12595 points
    Thanks Alex, I suspected that was the case. Good to have it verified. Quick follow-up question. Even though the tool reports a voltage conflict warning, does it still output the correct settings to the output files? I can probably go in by hand and figure this out but if you know the answer off-hand then that would save me some time.

    Thanks
  • 0 in reply to Brad Caldwell
    TI__Genius 13567 points

    Hi Brad,

    There is no PMT output affected by the voltage domain settings. The feature is meant to help the system designer in the planning of their pin assignments. For the Sitara devices with dual-voltage rails there is a chance that a particular VDDSHVx domain is 1.8V and another VDDSHVx is 3.3V. You would want to avoid connecting any pins on that 1.8V VDDSHVx domain with external 3.3V devices and vice versa any external 1.8V devices shouldn't be connecting to a pin on the 3.3V VDDSHVx domain.

    Peripherals like USB and HDMI will have some 1.8V pins and 3.3V pins mixed and the PMT doesn't have an exception to ignore that.

    Regards,
    Ahmad