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TM4C129XNCZAD: External Memory for Program Code

Rahul Ramachandran
Intellectual 800 points
Part Number: TM4C129XNCZAD


 Hello

My customer need technical support  on below request .

From the available data sources, we found that TM4C129XNCZAD will be the best suite for our project but only constraint is size of internal Flash memory. So as a solution we want to use external memory as program code area.

 

As I requires the OTA feature also so I will plan to execute the application boot loader code using internal flash of microcontroller and application code will be executed from the external flash.

 

Can you please suggest any way by which External Flash can be used as a program code.

 

Below mentioned diagram is for your reference.

  • +1
    TI__Guru**** 191906 points

    Hi Rahul,

      There is a EPI module on TM4C129 that you can use in Host-Bus to interface with external flash memory. Please refer to EPI user's guide in the datasheet for details.  If the external flash you are referring to is a serial flash such as SPI Flash then code execution from it is not possible. What you can do is to read the pre-programmed code from the external SPI flash and copy it to the internal RAM and execute code out of RAM.