MPC5775K NCF[4] Can't be cleared during FCCU initiation

[shijianyong]

Hi 

      Our product use MPC5775K and FS6523. There is a boot failure  when the ambient temperature below -25℃。

      The initiation process stop at the while loop of FCCU_init() :

         FCCU_init()     while(FCCU.CTRL.B.OPS != 0x3)

      I tried to clear all NCF before config FCCU, but NCF[4] can't be cleared, and SSCM_STATUS.CERS is set and can't be clear by writing '1'.

      When ambient temperature goes above -25℃, there is no such issue.  

petervlna‌

[petervlna]

Hi,

you wont be able to clear this NCF[4] until the SSCM is still reporting it via CERS bit.

MEMORY_DCF_SAFETY_ERR - Indication of fault during timing/repair configuration initialization by SSCM of different memories. Faults can be caused by parity or triple-redundant errors in loaded configuration data.

In other words, you have a mismatch in safety DCF client you have programmed into UTEST flash memory.

Please make sure your safety DCF clients are correct or use our calculator:

MPC57xx - DCF records 

https://community.nxp.com/docs/DOC-335523 

Peter

[fu860925]

MPC5744P，fccu，after FCCU_DRV_Init，inject  ncf[0]，  PMC->FIR = 0x4U，when debug this line，Error : Error in ONCE status register during instruction execution.  why?

[shijianyong]

Hi Peter,

      We didn't change the default DCF configuration, nor add any DCF records.  

      When ambient temperature goes above -25℃, there is no such fault.   I guess the fault is caused by parity or triple-redundant errors when loading configuration data, but I don't know why it occurs only when temperature is under -25℃.

[petervlna]

Hi,

Do you see this behavior on all samples or on just one?

Do you have your custom board or NXP evaluation board?

Peter

[shijianyong]

Hi Peter,

        We tested 10 samples, and 4 samples have this behavior.  We have evaluation board of MPC5775K. 

[petervlna]

hmm,

Could you share with me dump of your UTEST flash.

Because NCF4 is called on CERS set in SSCM. I would like to check user area of UTEST. There is no other possibility to trigger this fault except CERS bit.

Which cut of device are you using? 0N76P?

Peter