Kontron COMe-cSP2 - Manual (Page 50)

COMe-cSP2 / Special Features
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5.4 SD-card Interface (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® US15W System Controller Hub supports up to 3 SDIO interfaces. On COMe-cSP2 the first interface SDIO#0 is
used for the onboard miniSD Card socket. The second Port SDIO#1 provides the SD card interface shared with the
module GPIO signals to the baseboard. SDIO#3 is not used and deactivated. The integrated SDIO 1.1 / MMC 4.1
controller in US15W SCH only supports byte-address mode for SDIO storage cards up to 2GB. Sector-addressing and
SDHC is not supported.
» MMC 4.1 transfer rates can be up to 48MHz and bus widths of 1, 4 or 8 bits
» SDIO 1.1 supports transfer rates up to 24MHz and bus widths of 1 or 4 bits
Onboard miniSD/MMC Socket J4
PIN Description
1 DAT3/CD - Data Line 3/Card Detection
2 CMD - Command/Response
3 VSS 1 - Supply Voltage - GND
4 VDD - Supply Voltage - 3.3V
5 CLK - Clock
6 VSS2 - Supply Voltage - GND
7 DAT0 - Data Line 0
8 DAT1 - Data Line 1
9 DAT2 - Data Line 2
10 n.c.
11 n.c.
12 Detect
13 Ground 0
14 Ground 1
15 Ground 2
SDIO/GPIO on COM Express® Connector
General purpose Input/Output SD card interface signals
GPI0 SLOT0_DATA0
GPI1 SLOT0_DATA1
GPI2 SLOT0_DATA2
GPI3 SLOT0_DATA3
GPO0 SLOT0_CLK
GPO1 SLOT0_CMD
GPO2 SLOT0_WP
GPO3 SLOT0_CD#