Mpc5775 Internal Eeprom ECC

yanzc — Tue, 09 Aug 2022 09:04:06 GMT

Hi NXP:

I am testing to write data to the Emulation EEPROM and the power is turned off abnormally.When the power is turned on again, Read Eeprom data, Flash ECC error occurs and the code jump to IVOR1.This problem occurred very frequently ,How can i handle this?

I try to write 1 to MCR[EER] in IVOR1 to clear EER, but after that ,the code jump to IVOR4.

Thank you!

Re: Mpc5775 Internal Eeprom ECC

lukaszadrapa — Thu, 11 Aug 2022 15:26:19 GMT

Hi,

termination of erase or program operation by unexpected reset or power-down usually leads to ECC errors in those blocks. EEE driver is able to recover but must be configured appropriately. There are two ways depending on a microcontroller - it's either handled by IVOR1 exception or (if it is supported) via MCR[ERR].

Method using MCR[ERR] is supported only on microcontrollers which allow user to suppress reporting of ECC errors on data blocks. MPC5775E/B support this:

And in the EEE source files, you can find that this method is selected:

But the driver does not touch PFCR3[DERR_SUP], so it's responsibility of user to set this bit.

Regards,

Lukas

topic Re: Mpc5775 Internal Eeprom ECC in MPC5xxx

Mpc5775 Internal Eeprom ECC

Re: Mpc5775 Internal Eeprom ECC