Kontron COM Express Eval 10, User Manual

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COM Express® Eval Type 10 / Connectors and Features
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5.5 SD-Card / Module GPIO
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.
COM Express® Type 1 and Type 10 pin-out based modules may provide a SDIO interface shared with GPIO signals.
Therefore on COM Express® Eval Type 10 a SD-Card connector is available. Please check the documentation of your
module if SDIO is supported and how to enable.
Close configuration jumper J59 (default) to enable SD-Card Slot J43 or open J59 to enable GPIO pin-header J48.
SD-Card J43 PIN Description SD-Card J43 PIN Description
1 DAT3/CD - Data Line 3/Card Detection 8 DAT1 - Data Line 1
2 CMD - Command/Response 9 DAT2 - Data Line 2
3 VSS 1 - Supply Voltage - GND 10 Card Detect
4 VDD - Supply Voltage - 3.3V 11 Write Protect
5 CLK - Clock 12 COM (GND)
6 VSS2 - Supply Voltage - GND 13 Shield Ground 0
7 DAT0 - Data Line 0 14 Shield Ground 1
GPIO J48 PIN Description GPIO J48 Pin Description
1 VCC 3.3V 2 GPO0 / SD_CLK
3 GPI0 / SD_DATA0 4 GPO1 / SD_CMD
5 GPI1 / SD_DATA1 6 GPO2 / SD_WP
7 GPI2 / SD_DATA2 8 GPO3 / SD_CD#
9 GPI3 / SD_DATA3 10 GND
Note1: A SD-Card is detected if Card Detect is at low level. The write protection is active (read only) if SD_WP is at
high level.
Note2: The switching circuitry which selects GPIO or SDIO interface may influence the signal quality of SDIO which
results in detection or boot issues with some fast SD/SDHC cards. Therefore it's recommended to reduce
SDIO interface speed to 24MHz in module's BIOS if supported