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schematics for microSd on SDMMC

MLe M.1
Associate II

Hello,

Do you have schematics suggestion for using a microSD on the SDMMC interface of the STM32L476? The reference manuel only shows data with 8 lines while the microSD has only 4 lines with data3 share with card detect.

Do I only need to ignore the card detect and configure bus has 4 lines?

Best regards

Mich

1 ACCEPTED SOLUTION

Accepted Solutions
SofLit
ST Employee

Hello,

For hardware, you can refer to  STM32L476G-EVAL Schematics downloadable from this link.

For Software you can refer to the example available in STM32L4 cube under the path: Projects\STM32L476G-EVAL\Applications\FatFs\FatFs_uSD_Standalone

Hope this does answer your question.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

View solution in original post

2 REPLIES 2
SofLit
ST Employee

Hello,

For hardware, you can refer to  STM32L476G-EVAL Schematics downloadable from this link.

For Software you can refer to the example available in STM32L4 cube under the path: Projects\STM32L476G-EVAL\Applications\FatFs\FatFs_uSD_Standalone

Hope this does answer your question.

To give better visibility on the answered topics, please click on "Accept as Solution" on the reply which solved your issue or answered your question.

0693W000003Bg2XQAS.pngGenerally the interface takes 6 pins. with a 7th GPIO pin connected to a mechanical switch on the SD Card holder/socket to indicate the card is present. Use this so you can detect removal, etc.

Now MMC+ cards and eMMC can support 8-bit modes, but the former kind of disappeared rather quickly as a standard, and sockets are hard to find. Basically everyone pivoted into the MicroSD form-factor and 50+ MHz bandwidths.

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