Gigabit Ethernet - ADLINK Technology COM Express cExpress-TL User Manual

cExpress-TL User's Guide
4.3.4

Gigabit Ethernet

Name Pin # Description
GBE0_MDI0+ A13 Gigabit Ethernet Controller 0: Media Dependent Interface Differential Pairs 0, 1, 2,
GBE0_MDI0- A12 3. The MDI can operate in 1000, 100, and 10Mbit/sec modes. Some pairs are
GBE0_MDI1+ A10 unused in some modes according to the following:
GBE0_MDI1- A9
GBE0_MDI2+ A7
MDI[0]+/-
GBE0_MDI2- A6
MDI[1]+/-
GBE0_MDI3+ A3
MDI[2]+/-
GBE0_MDI3- A2
MDI[3]+/-
GBE0_ACT# B2 Gigabit Ethernet Controller 0 activity indicator, active low.
GBE0_LINK# A8 Gigabit Ethernet Controller 0 link indicator, active low.
GBE0_LINK100# * A4 Gigabit Ethernet Controller 0 100Mbit/sec link indicator, active low.
GBE0_LINK1000# * A5 Gigabit Ethernet Controller 0 1000Mbit/sec link indicator, active low.
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.
GBE0_SDP A49 Gigabit Ethernet Controller 0 Software-Definable Pin. Can also be used for
IEEE1588 support such as 1pps signal.
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
Page 30
1000 100 10____
B1_DA+/- TX+/- TX+/-
B1_DB+/- RX+/- RX+/-
B1_DC+/-
B1_DD+/-
Copyright © 2021 ADLINK Technology, Inc.
I/O PU / PD Comment
I/O Analog Twisted pair signals for
external transformer.
OD 3.3VSB
OD 3.3VSB
OD 3.3VSB
OD 3.3VSB
REF Not supported
GND min
3.3V max
IO 3.3VSB GBE0_SDP Depends on the selection
of LAN controller
PICMG COM.0 R3.0