ETRA SOM/ETRA Hardware/Peripherals/SDMMC
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Peripheral SDMMC[edit | edit source]
Secure digital input/output MultiMediaCard interface (SDMMC) provides an interface between the AHB bus and SD memory cards, SDIO cards and eMMC devices.
ETRA SOM provides up to two SDMMC interfaces: the second interface (SDMMC2) is internally used if the eMMC flash is populated in the SOM.
Description[edit | edit source]
The SDMMC interface available on ETRA SOM is based on STM32MP1 SoC.
The SDMMC port supports the following standards and features:
- compliance with Embedded MultiMediaCard System Specification Version 5.1
- card support for three different databus modes: 1-bit (default), 4-bit and 8-bit (HS400 is not supported)
- full compatibility with previous versions of MultiMediaCards (backward compatibility)
- full compliance with SD memory card specifications version 6.0 (SPI mode and UHS-II mode not supported)
- full compliance with SDIO card specification version 4.0 (SPI mode and UHS-II mode not supported)
- data transfer up to 208 Mbyte/s for the 8-bit mode
Pin mapping[edit | edit source]
The Pin mapping is described in the Pinout table section
