2389844_en-US

i.MX8MPLUS uSDHC HS400 mode with enhanced strobe

Is there a recommended procedure to activate the enhanced strobe in HS400? Is it sufficient to set the EN_HS400_MODE in the MIX_CTRL register or does it need some additional modifications in the STROBE_DLL_CTRL register?

Regards,

Stefan

Re: i.MX8MPLUS uSDHC HS400 mode with enhanced strobe

Hi @Stefan_CIT

The HS400ES requires simultaneous configuration on both the eMMC and host sides. Setting EN_HS400_MODE alone is only part of the host-side configuration and is not sufficient to enable the HS400 Enhanced Strobe feature.

If you are using Linux BSP, the driver automatically completes the DLL and tuning configurations.

Best Regards,
Zhiming

Re: i.MX8MPLUS uSDHC HS400 mode with enhanced strobe

Hi @Zhiming_Liu

Thanks for the reply.

We use the #I.MX8MPLUS with INTEGRITY OS and maintain the uSDHC-driver by ourselves. So, I'll try to transfer the process from the Linux-Driver

Best regards,

Stefan

Re: i.MX8MPLUS uSDHC HS400 mode with enhanced strobe

There is a better documentation about the Strobe-DLL and the switching to the enhanced strobe mode In those ReferenceManuals.

https://www.nxp.com/docs/en/reference-manual/IMX93RM.pdf

I guess the i.MX9 processors still have the same uSDHC-IP.

Regards,
Stefan