Sd-card / module gpio, 5 sd-card / module gpio – Kontron COMe Eval Carrier T10 User Manual
Page 26

COM Express® Eval Type 10
/ Connectors and Features
23
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