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TMS320F2812: Problems while trying to connect to TMS320F2812 with code composer V3.3

BIAZ Aimen
Prodigy 40 points
Part Number: TMS320F2812

Hi,

I am using TMS320F2812 DSP in my design. I am not able to communicate with my target via code composer(V3.3). I am working with XDS510LC USB

I chcecked Jtag connection and the target power supply, it seems all right.

The image below shows the jtag signals on my board :

The second image is the pin header signals of the emulator cable:

Note that the connector of the emulator cable is not plugged directly on the JTAG connector on my board. The connection is ensured through a tool board with a corresponding connector compatible with the one in the second image (emulator side) :

and an other connector compatible with the one in the first image (Board side):

The signals go from a connector to an other through a buffer 74LVT244APW:

Yet I didn't connect on my board the TCK-RET signal, i don't know if it could be a problem.
I verified with scope while trying to connect the target via code composer, all i can see is TCK signal variation, and nothing else on the other signals (TMS, TDI, TDO, TRST).

Note 1 :
- This is the first connection to my target.
-There is no software code on the flash memory.
-While trying to connect to an other TMS320F2812 with some code in its memory , it worked!!

How can i get this problem solved please, any ideas ?

  • 0
    TI__Mastermind 23320 points

    Hello,

    BIAZ Aimen said:
    Yet I didn't connect on my board the TCK-RET signal, i don't know if it could be a problem.
    I verified with scope while trying to connect the target via code composer, all i can see is TCK signal variation, and nothing else on the other signals (TMS, TDI, TDO, TRST).

    You shouldn't need the TCK-RET signal, so this is not the issue. When you were able to connect to a programmed TMS320F2812, were you seeing something on the TMS, TDI, TDO, TRST pins? Are were you using the same board/JTAG connections?

    Best Regards,

    Marlyn