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Contents
Peripheral SDMMCEdit
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.
DescriptionEdit
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 mappingEdit
The Pin mapping is described in the Pinout table section