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SD Card HighSpeed mode in SPI-mode

Question asked by pfeifferc on Jul 18, 2014
Latest reply on Sep 30, 2014 by pfeifferc

Hi !

We are using a modified Driver to communicate via SPI to an ext. micro-SD Card.

Everything is fine. Now we try to Speed up the Interface because max. frequency is 25MHz in std mode.


If the concerned Card Support SDCard spec.1.10 or higher there is an option to Switch into highspeed mode(<50MHz)

for faster communication. So i implement this CMD6 to Switch the Speed, but after this there is no Chance to communicate with the Card.

I tried to use another SPI mode CPHA etc. but i dont know whats going wrong.


Is there somebody out there who know how to handle/implement this mode


Kind regards christoph