flexSPI operations in QPI mode

adi2Intel — Sun, 26 Mar 2023 07:07:57 GMT

continue this topic : Re: Read Id using flex SPI on QPI mode - NXP Community

and with this FLASH device : W25Q128FV pdf, W25Q128FV Description, W25Q128FV Datasheet, W25Q128FV view ::: ALLDATASHEET :::

and with modified code for the SDK example : flexspi_nor_polling_transfer

all single SPI operations works perfect

we are trying to use operations on QPI mode

lets focus on 2 operations: Reading Jedec ID and Program Page

the enable bit on status register is set.

the LUT entry for enabling QPI mode:

[4 * NOR_CMD_LUT_SEQ_IDX_ENTERQPI] =
FLEXSPI_LUT_SEQ(kFLEXSPI_Command_SDR, kFLEXSPI_1PAD, 0x38, kFLEXSPI_Command_STOP, kFLEXSPI_1PAD, 0)

and the code :

status_t flexspi_nor_enable_qpi_mode(FLEXSPI_Type *base) { /* Write enable */ status_t status; flexspi_transfer_t flashXfer; status = flexspi_nor_write_enable(base, 0); if (status != kStatus_Success) { return status; } flashXfer.deviceAddress = 0; flashXfer.port = FLASH_PORT; flashXfer.cmdType = kFLEXSPI_Command; flashXfer.SeqNumber = 1; flashXfer.seqIndex = NOR_CMD_LUT_SEQ_IDX_ENTERQPI; status = FLEXSPI_TransferBlocking(base, &flashXfer); if (status != kStatus_Success) { return status; } //status = flexspi_nor_wait_bus_busy(base); /* Do software reset. */ FLEXSPI_SoftwareReset(base); return status; }

the busy wait is commented because it stucks\hangs\deadlock.

as for Jedec ID, the entry is this:

/* Read ID */
[4 * NOR_CMD_LUT_SEQ_IDX_READID] =
FLEXSPI_LUT_SEQ(kFLEXSPI_Command_SDR, kFLEXSPI_4PAD , 0x9F, kFLEXSPI_Command_READ_SDR, kFLEXSPI_4PAD , 0x04)

and the result, after entering QPI mode, is 0x1940ff

the result on Single SPI is 0x1940ef and this is the correct one, with this LUT:

[4 * NOR_CMD_LUT_SEQ_IDX_READID] =
FLEXSPI_LUT_SEQ(kFLEXSPI_Command_SDR, kFLEXSPI_1PAD , 0x9F, kFLEXSPI_Command_READ_SDR, kFLEXSPI_1PAD , 0x04)

2.now we have issue with programming.

using this:

[4 * NOR_CMD_LUT_SEQ_IDX_PAGEPROGRAM_SINGLE] =
FLEXSPI_LUT_SEQ(kFLEXSPI_Command_SDR, kFLEXSPI_4PAD, 0x02, kFLEXSPI_Command_RADDR_SDR, kFLEXSPI_4PAD, 0x20),
[4 * NOR_CMD_LUT_SEQ_IDX_PAGEPROGRAM_SINGLE + 1] =
FLEXSPI_LUT_SEQ(kFLEXSPI_Command_WRITE_SDR, kFLEXSPI_4PAD, 0x20, kFLEXSPI_Command_STOP, kFLEXSPI_4PAD, 0),

only the first programming command works, after setting 4 byte mode and entering QPI mode.
so I can only program a single page in one run. strange. what is missing? maybe the stop command is not valid?

it actually stuck on busy wait and I need to remove the busy wait command. could it be related?

from spec:

EDIT : programming issue solved. only JedecID issue left

Thanks

Adi

Intel

Re: flexSPI operations in QPI mode

adi2Intel — Tue, 21 Mar 2023 09:44:42 GMT

Here is a logic analyzer sniff from read ID command :

without drawings:

notice the issue in the manufacture ID that should be EF:

so there is an ussue on clock cycle 2

topic flexSPI operations in QPI mode in i.MX RT Crossover MCUs

flexSPI operations in QPI mode

Re: flexSPI operations in QPI mode