RM48L952: SRAM Live Lock Test

Hello,

Please refer to this thread for details on SRAM_LIVELOCK test : https://e2e.ti.com/support/microcontrollers/hercules/f/312/p/569492/2100035

Guy Tadi said:

Also, what is the resolution of these concerns? https://e2e.ti.com/support/microcontrollers/hercules/f/312/t/606860?RM48L952-SafeTI-SRAM-LIVELOCK-DIAGNOSTICS-is-that-test-complete-ready-to-run-

Are system state preserved and restored after the test?

I'm looking into this and will get back to you with more details.

Thanks,

Akshay

Thanks. I understand clearly now what livelock test does. But my question still remains: why does it return TRUE but not set *sram_stResult = ST_PASS or *sram_stResult = ST_FAIL anywhere. What is the pass/fail condition for this test? The case block for SRAM_LIVELOCK_DIAGNOSTICS is below:

    case SRAM_LIVELOCK_DIAGNOSTICS:
        (void)SL_FLAG_SET(testType);

        tp = (volatile uint64 *)0x08000004u; /*start address of unaligned access*/
        eccB1 = (volatile uint64 *)0x08000000u; /*bank1 base word*/
        /*SAFETYMCUSW 567 S MR:17.1,17.4 <APPROVED> "Pointer increment needed" */
        eccB1 = eccB1 + (0x00400000u/sizeof(uint64)); /*pointer to ecc for bank1 base word*/
        eccB2 = (volatile uint64 *)0x08000008u; /*bank2 base word*/
        /*SAFETYMCUSW 567 S MR:17.1,17.4 <APPROVED> "Pointer increment needed" */
        eccB2 = eccB2 + (0x00400000u/sizeof(uint64)); /*pointer to ecc for bank2 base word*/

        /* Enable Writes to ECC RAM */
        /*SAFETYMCUSW 9 S MR: 12.2 <APPROVED> Comment_10*/
        /*SAFETYMCUSW 134 S MR: 12.2 <APPROVED> Comment_5*/
        BIT_SET(sl_tcram1REG->RAMCTRL, TCRAM_RAMCTRL_ECCWREN);
        /*SAFETYMCUSW 9 S MR: 12.2 <APPROVED> Comment_10*/
        /*SAFETYMCUSW 134 S MR: 12.2 <APPROVED> Comment_5*/
        BIT_SET(sl_tcram2REG->RAMCTRL, TCRAM_RAMCTRL_ECCWREN);

        regBkupRamTh1 = sl_tcram1REG->RAMTHRESHOLD;
        regBkupRamTh2 = sl_tcram2REG->RAMTHRESHOLD;

        /* set threshold to 1 */
        sl_tcram1REG->RAMTHRESHOLD = 0x1u;
        sl_tcram2REG->RAMTHRESHOLD = 0x1u;

            _SL_Barrier_Data_Access();

            /* cause a 1-bit ECC error */
            *eccB1 ^= TCRAM_SYN_1BIT_DATA_ECC;

            *eccB2 ^= TCRAM_SYN_1BIT_DATA_ECC;

            /* read from location with to be generate error */
            _SL_Barrier_Data_Access();

            ramread64 = (*tp); /*unaligned read*/

            _SL_Barrier_Data_Access();

        SL_FLAG_CLEAR(testType);

        break;
#endif

    default:
        retVal = FALSE;
        break;
    }

Hello,

Sorry for the delay.

The SRAM_LIVELOCK_DIAGNOSTICS test is not supported in the Safety Diagnostic Library. This has been documented in Table 3.API Mapping in the Software Safety Manual.

Thanks,

Akshay