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4.20
SDIO
The SD card standard is a standard for removable memory storages designed and licensed by the SD Card Association
(http://sdcard.org). The card form factor, electrical interface, and protocol are all part of the SD Card specification. The
Intel® Platform Controller Hub EG20T supports 2 SDIO interfaces. On nanoETXexpress-TT the first interface SDIO#0 is
shared with the module GPIO signals. On modules without SATA SSD the second EG20T SDIO interface SDIO#1 is available
via onboard microSD connector.
The integrated SD Host Controller conforms to SD Host Controller Standard Specification Ver. 1.0.
Features:
» SDHC up to speed class 6
» SDIO Card Specification Ver. 1.10
» MMC System Specification Ver. 4.1
» SD bus transfer mode
» MMC transfer mode
SDIO interface on COM Express connector:
General purpose Input/output
GPI0
GPI1
GPI2
GPI3
GPO0
GPO1
GPO2
GPO3
43
COMe-mTT10 / Features and Interfaces
SD card interface signals
SLOT0_DATA0
SLOT0_DATA1
SLOT0_DATA2
SLOT0_DATA3
SLOT0_CLK
SLOT0_CMD
SLOT0_WP
SLOT0_CD#
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