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limitation in Imx6- for setting SDR12 up to 25Mhz.

Question asked by Nagamahesh Gamidi on Feb 16, 2018
Latest reply on Feb 22, 2018 by Nagamahesh Gamidi

We have enabled sdhci to work at 1.8V at the Device tree level, there is level translator for 1.8v switching.


We are able to see the signal levels at 1.8v for clock setting from the Imx6  for 50Mhz and we can see data transfers working.

Issue here is when we go for 25Mhz setting from Imx sdhci host with 1.8v level, we see only 22 Mhz on the SD CLK line.

So we wanted to know if there is any limitation in Imx for setting SDR12 up to 25Mhz.

Note: I have tried setting 20Mhz, 30Mhz and 50Mhz at 1.8V from Imx sdhci host and it works.