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DM37xx Pin MUXing

Sergey Chub
Intellectual 400 points
Other Parts Discussed in Thread: DM3730

Hello.

I have a "silly" question. I'm sure the answer is pretty obvious but I'm just starting with these DSPs so I'm not aware of all the basic points.


Some functions of the DSP can be routed via SCM to several pins. For example, UART1_RX is "present" on at least two pins. What if I configure both these pins to operate as UART1_RX? How is this conflict resolved (if there really is a conflict)?

Thank you in advance

  • 0
    TI__Guru 65405 points

    Hi Sergey,

    There are 3 pins named uart1_rx on the dm3730 processor but if you looking at the Ball characteristics table in the data sheet only one pin corresponding to the uart1_rx in Mode 0 (default mode) which is the primary mode.  The other 2 pins are uart1_rx in mode 2 which is used for alternate function. On each pin, some modes are used effectively for alternate functions, while other modes are unused and correspond to no functional configuration.
    The safe mode avoids any risk of electrical contention by configuring the pin as an input with no functional interface mapped to it. The safe mode is used mainly as the default mode for all pins containing no mandatory interface at the release of POR.

    Probably if you configure two pins to operate as uart1_rx would appear some collision. Therefore I suggest you to use only this pin for uart1_rx which is uart1_rx in the primary mode.

    BR

    Tsvetolin Shulev