NAND FLASH 25N01GV with STM32H725 sector erase failure

[Ayaki.11]

Hello everyone, I am trying to use STM32H725 processor with NAND FLASH 25N01GV. The installation seems successful. But sector erase always fails with the same error Status Register(0xC0) = 0x04 (EFAIL - Erase Failure )

1. JEDEC ID read successful.

W25XXX_OP_READ_JEDEC_ID

WRITE	DUMMY	READ
0x9F	1 BYTES	0xEF,0xAA,0x21

2. Setting Up FLASH IC

a. W25XXX_OP_RST

WRITE	DUMMY	READ
0xFF	0 BYTES

b. W25XXX_OP_WRITE_ENABLE

WRITE	DUMMY	READ
0x06	0 BYTES

c. READ W25XXX_REG_CONF (RD REGISTER 0xB0 = 0x18 )

WRITE	DUMMY	READ
0x05,0xB0	0 BYTES	0x18 (En ECC, Buffer Mode)

d. WRITE W25XXX_REG_PROT (WR REGISTER 0xA0 = 0x00 )

WRITE	DUMMY	READ
0x01,0xA0,0x00	0 BYTES

e. WRITE W25XXX_REG_CONF (WR REGISTER 0xB0 = 0x18 )

WRITE	DUMMY	READ
0x01,0xB0,0x18	0 BYTES

e. READ W25XXX_OP_BBM_READ_LUT (RD LUTs 0xA5 = 0x00,0x00,.., 0x00 )

WRITE	DUMMY	READ
0x0A5	1 BYTES	0x00,0x00,.., 0x00 (80 bytes)

f. READ W25XXX_OP_BBM_READ_LUT (RD LUTs 0xA5 = 0x00,0x00,.., 0x00 )

WRITE	DUMMY	READ
0x0A5	1 BYTES	0x00,0x00,.., 0x00 (80 bytes)

3. Sector Erase:

a. WRITE W25XXX_OP_BLOCK_ERASE (BLOCK ERASE 0xD8 = 0x0000 )

WRITE	DUMMY	READ
0xD8,0x00,0x00,0x00	1 BYTES

b. READ W25XXX_REG_STAT (RD REGISTER 0xC0 = 0x04 )

WRITE	DUMMY	READ
0x05,0xC0	0 BYTES	0x04 (EFAIL - Erase Failure )

[KDJEM.1]

Hello @Ayaki.11 ,

This issue is already posted these discussion:

Solved: Re: STM32WB QSPI FLASH - Winbond(W25N01GV) - STMicroelectronics Community

Solved: Re: [STM32H750BX][QSPI] Issue with W25N01GVZEIG NA... - STMicroelectronics Community

The memory is supported if the command format is in line with the OCTOSPI controller frame format (AN5050):

But, according to the memory datasheet, Block Erase (D8h) command needs the address after the dummy bytes. 

Thank you.
Kaouthar

[Ayaki.11]

Thank you for your answer. I know that it is necessary to send an 8-bit dummy after the SECTOR ERASE command. You can see this if you look at the end of the tables. I think the source of the problem I am experiencing is different.

3. Sector Erase:

a. WRITE W25XXX_OP_BLOCK_ERASE (BLOCK ERASE 0xD8 = 0x0000 )

WRITE	DUMMY	READ
0xD8,0x00,0x00,0x00	1 BYTES

[KDJEM.1]

Hi @Ayaki.11 ,

To clarify my last comment, the microcontroller sends the OCTOSPI command fields in the following order:

1. Instruction
2. Address
3. Alternate bytes
4. Dummy
5. Data

But, the erase command needs the address after the dummy bytes, not before. This command does not follow the order supported by OCTOSPI controller frame format.

Please take a look to this discussion. 

Thank you.

Kaouthar

[Ayaki.11]

Thanks again. I know that. Erase sector sequence is COMMAND+DUMMY BYTES+ADDRESS. But order is not important for my example. My Address= 0x0000 and I write dummy bytes as 0x00. My output data is 0xD8,0x00,0x00,0x00.

[Tesla DeLorean]

I've used these but not spent much time with them.

Looks at Flight Controller BlackBox implementations. Review data sheet. Watch for block protection or alignment if erase fails. Form of address passed.

[Ayaki.11]

Apparently I cannot write the correct value for Protection Register / Status Register-1 (0xA0 = 0x7C). I try to write 0x02 but operation can not be successfull.