Eurotech Appliances An0038 manual Ethernet interface, J4 CPU-1220 Ethernet connector

8 Application Note

Comparing the CPU-1220 serial number1 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

IDE	LED
	J4
	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 +3,3V2	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

1The 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.

2Depending 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.