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AWR1642: Is it possible to use the UART port to burn QSPI flash?

Sy Su
Expert 5390 points
Part Number: AWR1642
Other Parts Discussed in Thread: TM4C1294NCPDT, UNIFLASH

We are looking to to make a small AWR1642 module.

Is it possible to remove the TM4C1294NCPDT chip used for the XDS110 on-board Debugger for the AWR1642 EVM? The plan is to keep the SOP pins and pinout the UART port to an external RS232 chip to burn the SPI flash through the UART port directly, instead of using the XDS110 port.

Also we plan to pin out the JTAG connector and use an external JTAG tool to debug.

Could you please confirm that this is possible?

  • 0
    TI__Expert 5390 points

    Yes, this is possible.

    The XDS110 provides the functionality of accessing the device's QSPI flash over UART and debugging the device over the JTAG connection.

    Pinning out the JTAG connector to use an external JTAG tool to debug won't be a problem.

    From a hardware perspective, the UART can be driven by another buffer instead of the XDS110 device. In your case, this would be an external RS232 chip.
    You will need to make sure you have software that allows the external RS232 chip to interface with the UART burning control of the QSPI flash. If you are still planning to use the USB port, UniFlash will be able to interface with the QSPI flash if the external chip is directly connected to UART.

    Also please make sure the new schematic meets the Voltage IO requirements for the connections.