• State
  • Locked Locked
  • Replies 6 replies
  • Subscribers 81 subscribers
  • Views 696 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430FR5969: how to implement ECC with CCS?

Cherry Zhou
Mastermind 22235 points
Part Number: MSP430FR5969

Hi team,

Here's an issue from the customer may need your help:

As shown in document, the MSP430FR5969 has error-correcting code FRAM.  They implemented the ECC code with the method shown in the "MSP430 Assembly Language Tools". 

After a data error was injected, customer downloaded the code to the MSP430 board. The data error was not corrected after power on.

How can they implement the ECC function with CCS?  Could you please provide more details and give some document on it? 

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 39735 points

    Hi Cherry,

    1. Does customer configure the ECC refer to this:

    2. To check whether the ECC works, they can check the register GCCTL0 in debug mode.

    3. Can you give more explain about "After a data error was injected, customer downloaded the code to the MSP430 board. The data error was not corrected after power on.". It seems that customer put a wrong data into the code, and download the code into FRAM. Then hope ECC to correct it. Is it right?

    Eason

  • 0 in reply to Eason Zhou
    TI__Mastermind 22235 points

    Hi Eason,

    Eason Zhou said:
    1. Does customer configure the ECC refer to this:

    They configure the ECC with linker as below:

     

    Eason Zhou said:
    2. To check whether the ECC works, they can check the register GCCTL0 in debug mode.

    2, The linker output was shown belown:

    Eason Zhou said:
    3. Can you give more explain about "After a data error was injected, customer downloaded the code to the MSP430 board. The data error was not corrected after power on.". It seems that customer put a wrong data into the code, and download the code into FRAM. Then hope ECC to correct it. Is it right?

    They download the code with error bit in debug mode,the register GCCTL0 remained zero. The ECC interupt was not triggered.

    Were the  procedures shown above right?

    Thanks and regards,

    Cherry

  • 0
    Guru 24405 points

    It appears that some flash parts have ECC (I have never seen one). Also, it appears that the ECC information is either calculated by the linker, or accessible somehow on the part. That is not the case with FRAM. Each write of data to FRAM causes the ECC information to be computed on the fly. Each read too since FRAM has a destructive read.

    The FRAM ECC hardware does signal when it runs into errors and you can check that.

  • 0 in reply to David Schultz
    TI__Mastermind 22235 points

    Hi,

    Thanks for your help!

    Is the FRAM word size 80 bits (64 bits of data, 16 bits of ECC)?

    Is the ECC 8 bits or 16 bits?

    If they want to trigger one bit ECC error, should we try to read 64 bits? 

    And could you share some example project codes with ECC function for reference?

    Thanks and regards,

    Cherry

  • 0 in reply to Cherry Zhou
    Guru 24405 points

    The internals of the FRAM ECC are a black box known only to TI. I seem to recall some discussion in another thread, but it doesn't really matter. It will correct all single bit errors and detect most others.

    You can't trigger an ECC error, only field an interrupt (if enabled) when one occurs. Any read that results in a cache miss requiring an FRAM read has a tiny chance of resulting in an ECC error. Very tiny.

    slaa526 says: "The tests indicate that the SER for FRAM is orders of magnitude lower than SRAM."

  • 0 in reply to Cherry Zhou
    Guru 42085 points

    You could take it to a cyclotron, bombard it with ions and try to induce an SEU.

**Attention** This is a public forum