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Doc.ID: 34938, Rev 1.0
Functional Description
CP342
CUSTOMER SPECIFIC
P R E L I M A R Y
2.3.2
Gigabit Ethernet
The CP342 board includes two 10Base-T/100Base-
TX/1000Base-T Ethernet ports.
The Boot from LAN feature is supported.
The Ethernet connectors are realized as RJ45 con-
nectors. The interfaces provide automatic detection
and switching between 10Base-T, 100Base-TX and
1000Base-T data transmission (Auto-Negotiation).
Auto-wire switching for crossed cables is also support-
ed (Auto-MDI/X).
RJ45 Connector J3A/B Pinouts
The J3A/B connector supplies the 10Base-T,
100Base-TX and 1000Base-T interfaces.
Ethernet LED Status
Activity (green):
This LED monitors network connection and activity. The LED lights up when
a valid link (cable connection) has been established. The LED goes temporarily off if network
packets are being sent or received through the RJ45 port. When this LED remains off, a valid
link has not been established due to a missing or a faulty cable connection.
Speed (green/orange):
This LED lights up to indicate a successful 100Base-TX or 1000BASE-
T connection. When green it indicates a 100Base-TX connection and when orange it indicates
a 1000Base-T connection. When not lit and the Activity LED is active, the connection is oper-
ating at 10Base-T.
Table 2-3: Pinouts of J3A/B Based on the Implementation
MDI / STANDARD ETHERNET CABLE
PIN
MDIX / CROSSED ETHERNET CABLE
10BASE-T
100BASE-TX
1000BASE-T
10BASE-T
100BASE-TX
1000BASE-T
I/O SIGNAL I/O SIGNAL I/O SIGNAL
I/O SIGNAL I/O SIGNAL I/O SIGNAL
O
TX+
O
TX+
I/O
BI_DA+
1
I
RX+
I
RX+
I/O
BI_DB+
O
TX-
O
TX-
I/O
BI_DA-
2
I
RX-
I
RX-
I/O
BI_DB-
I
RX+
I
RX+
I/O
BI_DB+
3
O
TX+
O
TX+
I/O
BI_DA+
-
-
-
-
I/O
BI_DC+
4
-
-
-
-
I/O
BI_DD+
-
-
-
-
I/O
BI_DC-
5
-
-
-
-
I/O
BI_DD-
I
RX-
I
RX-
I/O
BI_DB-
6
O
TX-
O
TX-
I/O
BI_DA-
-
-
-
-
I/O
BI_DD+
7
-
-
-
-
I/O
BI_DC+
-
-
-
-
I/O
BI_DD-
8
-
-
-
-
I/O
BI_DC-
Figure 2-3: Dual Gigabit Ethernet
Connector J3A/B
1
8
1
8
J3A
J3B
LAN1
LAN2
Activity
Activity
Speed
Speed
