How can I tune QSPI?

yongjin2712_cho — Mon, 12 Nov 2018 10:16:40 GMT

I'm using RT1050 mcu with MT25QL512 of micron.

I'm working well to read and erase and write to flash with SDR mode.

And MT25QL512 supports DDR mode. so I changes operation mode of flash from SDR to DDR

But in DDR mode, it doesn't work to read ID of flash

In SDR, I configure flexspi as below and it work well ( ID reads as 0x1020BA20)

flexspi_device_config_t deviceconfig = {
.flexspiRootClk = 100000000,
.flashSize = FLASH_SIZE,

...

}

CLOCK_InitUsb1Pfd(kCLOCK_Pfd0, 24); /* Set PLL3 PFD0 clock 360MHZ. */
CLOCK_SetMux(kCLOCK_FlexspiMux, 0x3); /* Choose PLL3 PFD0 clock as flexspi source clock. */
CLOCK_SetDiv(kCLOCK_FlexspiDiv, 2); /* flexspi clock 120M. */

const uint32_t customLUT[CUSTOM_LUT_LENGTH] = {

  [4 * NOR_CMD_LUT_SEQ_IDX_READID] =
   FLEXSPI_LUT_SEQ(kFLEXSPI_Command_SDR, kFLEXSPI_1PAD, 0x9F, kFLEXSPI_Command_READ_SDR, kFLEXSPI_1PAD, 0x04),
  [4 * NOR_CMD_LUT_SEQ_IDX_READID + 1] =
   FLEXSPI_LUT_SEQ(kFLEXSPI_Command_STOP, kFLEXSPI_1PAD, 0, kFLEXSPI_Command_STOP, kFLEXSPI_1PAD, 0),

}

In DDR, I configure flexspi as below and it doesn't work well ( ID reads as 0x04882E08)

flexspi_device_config_t deviceconfig = {
.flexspiRootClk = 45000000,
.flashSize = FLASH_SIZE,

...

}

const uint32_t customLUT[CUSTOM_LUT_LENGTH] = {

  [4 * NOR_CMD_LUT_SEQ_IDX_READID] =
   FLEXSPI_LUT_SEQ(kFLEXSPI_Command_DDR, kFLEXSPI_1PAD, 0x9F, kFLEXSPI_Command_READ_DDR, kFLEXSPI_1PAD, 0x04),
  [4 * NOR_CMD_LUT_SEQ_IDX_READID + 1] =
   FLEXSPI_LUT_SEQ(kFLEXSPI_Command_STOP, kFLEXSPI_1PAD, 0, kFLEXSPI_Command_STOP, kFLEXSPI_1PAD, 0),

}

How can I fix it?

Re: How can I tune QSPI?

AldoG — Wed, 21 Nov 2018 18:31:02 GMT

Hello,

Could you tell me if you set it to work in DTR mode?

Because I see that the memory needs to be configured for that, the Nonvolatile Configuration Register bit 5.

BR,

Aldo.

Re: How can I tune QSPI?

yongjin2712_cho — Tue, 27 Nov 2018 15:56:18 GMT

Ok, it needs some configuration to work in DTR mode as you said. So I'm trying to test it to set fifth bit of enhanced volatile configuration register

topic How can I tune QSPI? in i.MX RT Crossover MCUs

How can I tune QSPI?

Re: How can I tune QSPI?

Re: How can I tune QSPI?