stm32h743xi6 emmc and spi flash chips selection for pcb

[chonkzman]

Hi all,

I'm looking for recommendations on eMMC chips that are known to work reliably with the STM32H743 via SDMMC1 in 8-bit mode.

I've gone through a number of threads here and put together what I've found so far:

- Micron 4GB (MTFC4GACAJCN) — comes up often, though some posts mention HAL misreading certain CSD fields (appears cosmetic rather than functional)
- Kingston 4GB — confirmed working with SDMMC1 + FatFS + FreeRTOS, corruption reports seem tied to FatFS rather than the chip itself
- Samsung KLM series — functional but VCCQ voltage negotiation adds complexity
- Kioxia THGBMDG5D1LBAIL — 153-ball WFBGA, eMMC 5.0, fewer reports but looks promising

Happy to keep things simple — 3.3V on both VCC and VCCQ, no need for HS200/HS400.

Would love to hear from anyone who has had long-term success with a particular chip, or any that are worth avoiding. Any layout tips for the 153-ball WFBGA package are also welcome.

[mƎALLEm]

Hello @chonkzman and welcome to the ST community,

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@chonkzman wrote:

- Micron 4GB (MTFC4GACAJCN) — comes up often, though some posts mention HAL misreading certain CSD fields (appears cosmetic rather than functional)

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MTFC4GACAJCN is available already on STM32H7 disco board such as STM32H745-DISCO and STM32H750-DISCO. Need to use the BSP drivers provided in the CubeHAL of the boards:

eMMC driver for STM32H745-DISCO:

https://github.com/STMicroelectronics/stm32h745i-disco-bsp/blob/a853043cbeb37280747f5554dc791e4ee58c91b0/stm32h745i_discovery_mmc.c

eMMC driver for STM32H750-DISCO:

https://github.com/STMicroelectronics/stm32h750b-dk-bsp/blob/e15ab34e23e2929f768f3f00efe9aac75f057b50/stm32h750b_discovery_mmc.c

And this is the schematic:

Hope that helps.