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Are Pull-ups needed for SDIO

Question asked by federico.jacob on Sep 23, 2011
Latest reply on Sep 23, 2011 by Andrew Queisser
Hello,

I noticed that the schematic for the STM3220G-EVAL which uses an STM32F207 has a 47K pull-up on each of the non-power pins associated with the micro-sd card. I am currently designing a very space constrained board so I would like to avoid any extra components. Are these resistors needed for SDIO communication with an SD card to work? Can internal pull-up resistors be used?

I wasn't able to find much information on this, so any insight would be helpful.

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