SD-Card connect to STM32H7x3

[Gunnar Bohlen]

Hello,

I would like to start a new design based on STM32H7x3.

The STM32H7 Evalboard uses a dual voltage level translator between MCU and SD-Card. But this required some extra pins (DIR_0,DIR_1_3, CLK_FB, DIR_CMD) that I need for anothere peripheral.

Could someone confirm that I can directly connect a SD-Card (or eMMC in 4bit mode) only using DATA[0..3], CMD, CLK instead?

Does anyone know of a Evalbord that connects a SD-Card in this "simpe" way to the MCU?

Thank you.

[Tilen MAJERLE]

Check schematics of F746-Discovery kit.

https://www.st.com/en/evaluation-tools/32f746gdiscovery.html

You may do it with 6 pins for 4-bit SDIO.

[Tesla DeLorean]

I've used SD and eMMC directly using classic wiring on NUCLEO H743ZI​

I have an other board, also without transceiver.

[Gunnar Bohlen]

thank you.