Kontron nanoETXexpress, User Manual

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6 5BConnector and feature description
Kontron User's Guide
nanoETXexpress Evaluation Board
32
6.16 SDIO & GPIO (J43, J48)
COMexpress defines a maximum of 4GPIs and 4 GPOs. With the new nanoETXexpress standard the 8
General Purpose Input/Output signals alternatively can be configured as SDIO interface. Refer to the
module's manual if SD Card feature is supported and how to be configured.
A TI74LVCH244A octal buffer provides galvanic isolation between SDIO and GPIO output connectors. J43
is active, if a SD Card is connected (Pin10, Detect).
SDIO & GPIO pin out
Pin SDIO - J43 GPIO - J48
1 CD/DAT3 - Card Detection (GPI3) VCC 3,3V
2 CMD - Command/Response (GPO1) GPO #0
3 VSS1 - Supply Voltage - GND GPI #0
4 VDD - Power Supply - 3,3V GPO #1
5 CLK - Clock (GPO0) GPI #1
6 VSS2 - Supply Voltage - GND GPO #2
7 DAT0 - Data Line 0 (GPI0) GPI #2
8 DAT1 - Data Line 1 (GPI1) GPO #3
9 DAT2 - Data Line 2 (GPI2) GPI #3
10 Detect (GPO3) GND
11 Protect (GPO2) -
12 GND -