Can FlexSPI DQS be ignored?

[Cindy]

Hi,

This DQS line is for Read Write Data Strobe. I have been looking at a few FlexSPI examples:-

sdk_flexspi_nor_polling_transfer

polling_transfer_hyperRAM

In both of the example,  GPIO_SD_B1_05_FLEXSPIA_DQS pin are initialised:-

IOMUXC_SetPinMux(IOMUXC_GPIO_SD_B1_05_FLEXSPIA_DQS, 1U);

Due to the limited spare pin(s) available, I have a question:-

Is it possible to not initialise the _DQS pin, and assume "no additional latency " is needed?

Please help!Thanks!

Best Regards,

Cindy

[jay_heng · Accepted solution]

If GPIO_SD_B1_05 is configured as normal GPIO, then Flash/HyperRAM device cannot work at high speed mode (60MHz or upper). it is about FlexSPIn_MCR0[RXCLKSRC] configuration.

You can see details in IMXRT data sheet.