Kontron COMe-cXLi2 - Manual (Page 51)

Kontron COMe-cXLi2 User’s Guide
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NOTE: The integrated SDIO 1.1 / MMC 4.1 controller on the US15WPT only
supports byte-address mode for SDIO storage cards up to 2GB. Sector-
addressing and SDHC are not supported.
» MMC 4.1 supports transfer rates up to 48 MHz and bus widths of 1, 4, or 8
bits
» SDIO 1.1 supports transfer rates up to 24 MHz and bus widths of 1 or 4
bits.
Figure 8: Onboard microSD/MMC Socket J4
1 DAT2 – Data Line 2
2 CD/DATA3
3 CMD – Command Line
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 GND - Lever
10 Detect Switch
11 Not connected
12 Detect
13 Ground 0
14 Ground 1
Table 12. SDIO/GPIO on the COM Express® Connector
General Purpose
Input/Output (GPIO)
SD Interface (SDIO)
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#
NOTES: 1) The SLOT0-CMD line needs a pull-up resistor that varies
depending on the length of the electrical paths (typically from 10k Ohm