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Original question:

TMS570LS0432: TMS570 ECC detection check

TMS570LS3137: ECC TEST

Susan Yang
Genius 9955 points
Part Number: TMS570LS3137


Dear team,

How to inject 1 bit and 2 bit errors to check whether ECC is normal？

For RAM, it is usually tested by calling checkRAMECC() after enabling ECC.

But how to inject 1 bit and 2 bit errors in detail?

Thanks!

  • 0
    TI__Guru**** 197706 points

    Hello Susan,

    The SRAM is protected by ECC. The ECC value is stored in the memory space starting at 0x08400000. The ECC of the data at 0x08000008 (64-bit aligned) is located at 0x08400008. For every 64-bit RAM data write, the CPU also writes 8-bit ECC is ECC RAM space. If any write access smaller than 64-bits, the CPU performs read-modify-write process: read 64-bit data, modify the specified bytes, write new data and new ECC back.

    The ECC memory can also be directly accessed, but writing to the ECC space must also first be enabled via the RAM Control Register (RAMCTRL). 

    The 1 bit ECC error can be achieved by flip 1 bit of ECC value.

    The 2 bit ECC error can be achieved by flip 2 bit of ECC value.

  • 0 in reply to QJ Wang
    TI__Genius 9955 points

    Thanks for your reply.

    Can you tell me specifically how to do it? About how to Insert 1bit 2bit error

  • 0 in reply to Susan Yang
    TI__Guru**** 197706 points

    1. Enable writes to ECC RAM, enable ECC error response

        RAMCTRL = (0x1 << 8) | (0xA << 0);

    2. Disable RAM ECC

    3. Insert 1 bit ECC error by flip one bit (for example bit 0) of the value at 0x08400000 (or other address)

        or Insert 2 bit ECC error by flip two bit (for example bit 0 and bit 1) of the value at 0x08400000 (or other address)

        *(volatile uint32 *)(0x08400000U) ^ 0x01      ------- insert 1 bit ecc error

        or

        *(volatile uint32 *)(0x08400000U) ^ 0x03      ------- insert 2 bit ecc error

    4. enable RAM ECC

    5. Read data at 0x08000000 (it's ECC value is located at 0x08400000) to generate error