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AM2432: GPIO for DDR4 VTT Enable

Thomas Livick
Prodigy 70 points
Part Number: AM2432

Hello,

In reference to the TMDS243GPEVM schematic I noticed that the DDR4 VTT supply enable (DDR_VTT_EN) is connected to an OSPI chip select (L18, OSPI0_CSN1). For our design, it made more sense to connect the DDR4 VTT supply enable to a GPIO pin because it can drive 3.3V instead of the OSPI CS 1.8V. However, I am unsure if the GPIO pin mux can be set and toggled during boot, before the application is loaded and run from DDR4. I just need to make sure my firmware team will be able to enable the DDR4 VTT supply with a GPIO, before DDR4 is used.

If the TMDS243GPEVM design has the OSPI CS pin mux set to a GPIO to toggle the DDR4 VTT supply enable, that would probably answer my question.

Thanks,

Tom

  • +1
    TI__Mastermind 22685 points

    Hi Tom,

    The DDR4 VTT supply enable pin on the TMDS243GPEVM is intended to be used in mux mode 7 (GPIO mode).  For your use case, if you want the application to load and run from DDR4, you should ensure the pin is configured to enable the DDR4 VTT supply during your Secondary Boot Loader.

    Thanks,
    Mike