cExpress-TL User’s Guide
PICMG COM.0 R3.0
Page 30
Copyright © 2021 ADLINK Technology, Inc.
4.3.4
Gigabit Ethernet
Name
Pin #
Description
I/O
PU / PD
Comment
GB
GBE0_MDI0-
GB
GBE0_MDI1-
GB
GBE0_MDI2-
GB
GBE0_MDI3-
A13
A12
A10
A9
A7
A6
A3
A2
Gigabit Ethernet Controller 0: Media Dependent Interface Differential Pairs 0, 1, 2,
3. The MDI can operate in 1000, 100, and 10Mbit/sec modes. Some pairs are
unused in some modes according to the following:
1000
100
10____
MDI[0]+/-
B1_DA+/- TX+/-
TX+/-
MDI[1]+/- B1_DB+/- RX+/-
RX+/-
MDI[2]+/- B1_DC+/-
MDI[3]+/- B1_DD+/-
I/O Analog
Twisted pair signals for
external transformer.
GBE0_ACT#
B2
Gigabit Ethernet Controller 0 activity indicator, active low.
OD 3.3VSB
GBE0_LINK#
A8
Gigabit Ethernet Controller 0 link indicator, active low.
OD 3.3VSB
GBE0_LINK100# *
A4
Gigabit Ethernet Controller 0 100Mbit/sec link indicator, active low.
OD 3.3VSB
GBE0_LINK1000# *
A5
Gigabit Ethernet Controller 0 1000Mbit/sec link indicator, active low.
OD 3.3VSB
GBE0_CTREF
A14
Reference voltage for Carrier Board Ethernet channel 1 and 2 magnetics center
tap. The reference voltage is determined by the requirements of the Module PHY
and may be as low as 0V and as high as 3.3V. The reference voltage output shall
be current limited on the Module. In the case in which the reference is shorted to
ground, the current shall be 250 mA or less.
REF
GND min
3.3V max
Not
supported
GBE0_SDP
A49
Gigabit Ethernet Controller 0 Software-Definable Pin. Can also be used for
IEEE1588 support such as 1pps signal.
IO 3.3VSB
GBE0_SDP
Depends on the selection
of LAN controller
Note:
This product supports up to 2.5GbE. The LAN LED behavior is optimized for maximum 2.5GbE speed.
GBE0_LINK1000# will be active for 2.5GbE speed indication
GBE0_LINK100# will be active for 1GbE speed indication
For 100Mbit/sec and 10Mbit/sec speed, the LAN LED will be OFF
