Distributor of Olimex LTD: Excellent Integrated System Limited
Datasheet of A20-OLINUXINO-MICRO-4GB - BOARD ARM LINUX SGL A20 4GB
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OLIMEX© 2015
A20-OLinuXino-MICRO user's manual
USB_HOST two-level connector
Pin # Signal name Processor pin
Pin #
Signal name
Processor pin
1.1
5V
Connected to SY628
2.1
5V
Connected to SY628
1.2
UDM1
P20
2.2
UDM2
R20
1.3
UDP1
P21
2.3
UDP2
R21
1.4
GND
-
2.4
GND
-
The GND is common for both levels of the USB_HOST.
6.7 Ethernet
The LAN connectivity is handled by Realtek's RTL8201CP. Some of the features of this
10/100Mbit controller are:
- 10/100Mbps operation
- Full/half duplex operation
- Supports auto crossover detection
- Adaptive equalization
- IEEE 802.3/802.3u compliant
- Supports IEEE 802.3u clause 28; 1.8V
- Operation with 3.3V IO signal tolerance
and much more
The Ethernet connector is grounded according to the standard (check GND1 and GND2 lines on the
schematics).
If you use Linux then the Ethernet connector might be used for SSH connection to the board. If you
lack any other option for debugging it might be hard to guess the correct IP of the board since it has
DHCP enabled by default (especially if you are in a large network). It is good idea to check the
default settings by exploring the Linux image settings. Those are usually stored in:
/etc/network/interfaces
For DHCP you need to enable auto detection and dhcp as shown below:
auto eth0
iface eth0 inet dhcp
For setting a static address please follow the pattern below:
auto eth0
iface eth0 inet static
address 192.168.1.5
netmask 255.255.255.0
gateway 192.168.1.254
The EEPROM memory may be used to store the MAC address.
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