RTD Embedded Technologies, Inc.
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11
LAN17255HRHR User’s Manual
Pin
1000 Mbps Function
10/100 Mbsp Function
1
MDI_A+
Tr
2
MDI_A-
Transmit -
3
MDI_B+
R
4
MDI_C+
Not Used
5
MDI_C-
Not Used
6
MDI_B-
Receive -
7
MDI_D+
Not Used
8
MDI_D-
Not Used
Table 4: RJ45 Signal Assignments
CN5, CN7, CN9, CN11, and CN16 are standard female RJ-45 connectors. The figure below shows the pin numbering when
looking into the
connector
:
Figure 3: RJ-45 Jack Connector
3.3.3
T
WISTED
P
AIR
E
THERNET
CN4,
CN6,
CN8,
CN10,
AND
CN13
CN4, CN6, CN8, CN10, and CN13 are optional connectors which can be factory installed in place of the RJ45 connector. These connectors
can be connected to a 9-pin “D” connector using ribbon cable. The pin out of CN4, CN6, CN8, CN10, and CN13 is in the table below.
10-pin DIL
1000 Mbsp Function
10/100 Mbsp Function
9-Pin “D”
1
MDI_B+
R
1
2
MDI_B-
Receive -
6
3
MDI_C+
Not Used
2
4
MDI_C-
Not Used
7
5
MDI_A+
Tr
3
6
MDI_A-
Transmit -
8
7
MDI_D+
Not Used
4
8
MDI_D-
Not Used
9
9
Shield Ground
5
10
Shield Ground
N/C
Table 5: DIL Signal Assignments
3.3.4
S
TATUS
LED
S
The tri-color LEDs on the board are used to indicate the status of the Ethernet ports.
LED Color
Description
Off
No Link
Green
Link at 1000 Mbps
Blue
Link at 100 Mbps
Red
Link at 10 Mbps
Any color blinking
Activity
Table 6: Status LEDs
3.3.5
E
XTERNAL
S
TATUS
LED
C
ONNECTORS
CN14,
CN15,
CN18,
CN19,
AND
CN20
CN14, CN15, CN18, CN19, and CN20 are the status LED signals that are buffered and able to source or sink 24 mA. Additionally, JP1 can
select either 3.3 volts or ground to use with these signals. These connectors are not installed when the Ethernet RJ45 connectors and LEDs
are installed. The pin out is in the table below.