Functional Description
MEN Mikro Elektronik GmbH
37
20G020-00 E5 – 2014-01-21
2.11
Ethernet Interfaces
The G20 has two Ethernet interfaces connected to the platform controller hub via
two x1 PCI Express (PCIe) links. They are controlled by an Intel 82574L Ethernet
controller and an 82577LM Ethernet Controller PHY. They support 10 Mbits/s up to
1000 Mbits/s as well as full-duplex operation and autonegotiation.
The unique MAC address is set at the factory and should not be changed. Any
attempt to change this address may create node or bus contention and thereby render
the board inoperable. The MAC addresses on G20 are:
• LAN1:
0x 00 C0 3A 05 8x xx - 0x 00 C0 3A 05 Bx xx
• LAN2:
0x 00 C0 3A 05 Cx xx - 0x 00 C0 3A 05 Fx xx
where "00 C0 3A" is the MEN vendor code, "05" is the MEN product code. The last
four digits depend on the interface and the serial number of the product. The serial
number is added to the offset, for example for LAN1:
Serial number 0042:
0x xx xx = 0x002A = 0x 80 2A.
(See
Chapter 6.2 Finding out the Product’s Article Number, Revision and Serial
Number on page 89
.)
2.11.1
Front-Panel Connection
Two standard RJ45 connectors are available at the front panel. There are two status
LEDs for each channel at the front panel.
The pin assignment corresponds to the Ethernet specification IEEE802.3.
Table 7.
Signal mnemonics of Ethernet front panel connectors
Signal
Direction
Function
BI_Dx+/-
in/out
Differential pairs of data lines for 1000Base-T
RX+/-
in
Differential pair of receive data lines for 10/
100Base-T
TX+/-
out
Differential pair of transmit data lines for 10/
100Base-T
!
