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TMS320C6748: Using DDR pins for other components

Michael Khouw44
Prodigy 180 points
Part Number: TMS320C6748


We are running out of GPIO's and we are considering using the DDR pins on the DSP as input pins to interface with another component (not a DDR memory). Is it possible to do that? Can the other component write directly to the DDR pins and then use the DSP to read the data in the memory address corresponding to those pins ?

Thanks

Michael

  • 0
    TI__Guru**** 161600 points

    Hi Michael,

    As I see from the device datasheet the DDR pins cannot be muxed as another interface (i.e. GPIO). So if your plan is to connect the DDR data pins to an external interface and use the external interface to write in the DDR I am not sure this will work. Maybe if you use an FPGA as an external device connected to the DDR, but still the programming would be quite difficult.  I do not recommend this.

    If you are running out of GPIOs, I strongly recommend using a GPIO expander.

    Best Regards,

    Yordan