[S25FL127S] protection mode

[Anonymous]

part number: S25FL127SABMFV101

Our board is using S25FL127S flash memory.

I repeatedly turned the power on and off during the testing process.

The flash memory is protected by quickly repeating the above process

Other than flash memory, everything works normally.

I tried the review, but I could not find the cause.

1. OK state

Reg Addr / Data

0x35 : 02

0x05 : 00

2.NG state

Reg Addr / Data

0x35 : c2

0x05 : 9c

0x35 : Configuration Register 1 (CR1)

0x05 : Status Register 1 (SR1)

Is the status of the flash memory normal?

please tell me why flash memory is protected.

Thank you.

[Scott_Heo · Accepted solution]

Hello HS Jeon,

it is suspected that the flash device couldn't complete an flash internal initialization process during your power off/on cycles. it leads further array data access or SR/CR have incorrect settings temporarily. You may need to check the power-up/down voltage and timing in below, which also can be seen on S25FL127S datasheet.

Best regards,

Scott