Eurotech Appliances Eurotech Ethernet Adapter An0038 - Manual (Page 8)

8 Application Note
Comparing the CPU-1220 serial number 1 with the following table is possible to detect the installed chipset
version:
Table 1. CPU-1220 RTL8139 chipset version
CPU-1220 Eurotech s/n Realtek RTL8139 version
Till S.N. 229904389 B
Starting from 03M241 S.N. 229904390 C
Ethernet interface
The CPU-1220 module provides the following interfaces:
J4 for a 10/100 Ethernet (LAN) connection. J4 is a 5x2 pin – 2.54mm step connector
J9 for status LEDs: one for the HDD status, three for the Ethernet status. J9 is a 3x2 pin - 2mm step
connector
J4
LED IDE
Ethernet
Figure 2. J13 IDE Connector layout
J4: CPU-1220 Ethernet connector
The J4 Ethernet connector is a 5x2 pin with 2.54-mm step. Refer to the following table for the Ethernet
connector assignment.
Table 2. J4 Ethernet Connector
Pin# Signal Function
1 +5V or +3,3V 2 Power Supply
2 LED0 On sending packets
3 RX+ 100/10Base-T receive data
4 RX- 100/10Base-T receive data
5 LED1 Link 10/100
1 The Serial number of the CPU-1220 board is a bar code label printed on the PC/104 connector and
consists of a 10 characters length code.
2 Depending on the Realtek chipset installed: if Realtek RTL8139B is installed power supply is +5V, if
RTL8139C is installed +3,3V supplied. For detailed electrical information please refer to the chipset
datasheet.