Problem of program using qspi mt25qL128 with octospi STM32H735VGT

[PUN CHEE HUEY]

Hi All,

I have a custom board with STM32735VGT(this mcu is with 1=quad SPI but using the register octpspi). I am using the micro mt25qL128 NOR flash.

I am using the 1-1-1(1 bit instruction, 1 but data) for read and configure the registers, erase

I am using the 1-4-4(1 bit instruction, 4 bits address and data) for read and program.

All read registers, configure registers and erase is working fine.

Using 1-4-4 to read the flash is working fine too.

But when using program flash, the status is ok. I can see WIP and ready bit is correctly changed. But the flag status register read back is 144=0x90. Bit7 means ready. But bit4=1 shows it has failure and protect error or crc error.

Please help.

[PUN CHEE HUEY]

I am using external power supply to provide 3.3v (it  was 3.5 or more) to the custom board . will it damage the flash ?

[PUN CHEE HUEY]

How to re-open the discussion as the solution is still not known ?

[KDJEM.1]

Hello @PUN CHEE HUEY ,

Could you please respect the power conditions for a safe function else the MCU may be damaged. 

• The VDD = 1.62 to 3.6 V: external power supply for I/Os, provided externally through VDD pins.
• VDDX - VSS max =  4.0 V

For that I advise you to check all power condition in the product datasheet.

Thank you.

Kaouthar