In stm32h7 issue with SDMMC speed

[srikanth]

Actually i generated code for EMMC in cubeMX. I can able to write data with 1MBps. But i need 50MBps for this what can i change in driver file.

i am using 8-Bit datamode.

i tried with increase the clock frequency also the speed has not increased.

Any one knows help me..

[Tesla DeLorean]

That does seem disastrously slow.

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A sustained 50MBps write might be a challenge too, although you could get the wire speeds to that.

[Tesla DeLorean]

The H7 should be able to drive the eMMC interface in DDR52 mode

[Tesla DeLorean]

The eMMC on the STM32H745I-DISCO 4GB (THGBMDG5D1LBAIL)

10.28 MBps Write (FatFs)

27.04 MBps Read (FatFs)

PLL1_Q_CK=200000000, 200.00 MHz

SDMMC1_CK     2, 50.00 MHz

 8-bit 

I have 4-bit DDR working, 8-bit DDR did not.

https://www.glynshop.com/erp/owweb/Daten/Datenblaetter/DRAM_FLASH_MEDIEN/10_Nand%20solution/05_Toshiba/01_Datenblaetter/01_Original/eMMC/eMMC_15nm/THGBMDG5D1LBAIL_20151201_1.00.pdf

[Tesla DeLorean]

Part placed on board is a Micron MTFC4GACAJCN-1M WT (32 Gb, 4 GB)

JY976