FLEXSPI: MCR0[RXCLKSRC]==2 (dummy strobe via SCK pad)

[stefanct]

The RMs I checked (RT1020, RT1024, RT1170) show MCR0[RXCLKSRC]==2 as reserved. However, the MCUXPRESSO SDK contains

kFLEXSPI_ReadSampleClkLoopbackFromSckPad = 0x2U, /*!< SCK output clock and loopback from SCK pad. */

since the start of the official git repository (2021). I am wondering if the docs have not been updated or if this mode is actually not supported/working (haven't tried it yet).

[kerryzhou]

Hi @stefanct ,

  Thank you for your interest in the NXP MIMXRT product, I would like to provide service for you.

  This is not the issue, you can consider the SDK is for the future function expand usage.

  To the RM, 2 is reserved:

The software is just defined, but not used, for future consideration, you can ignore it, thanks.

Best Regards,

Kerry

[stefanct]

Thanks @kerryzhou. I have a bit of a problem interpreting your message though - specifically the future expansion part. Do you mean that future hardware might support that configuration but currently available hardware does not?

[kerryzhou]

Hi @stefanct ,

  No, it is just the SW consideration, not the HW.

  To the current RT 4 bit, it can't support the 2 situation.

  You can ignore the SW =2 situation, as it is not supported.

Best Regards,

Kerry