Gigabit Ethernet - ADLINK Technology AMD COM Express Express-VR7 User Manual

Express-VR7 User's Guide
4.3.2

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.
Gigabit Ethernet Controller MID Speed Link indicator. Active low. If active, the link
is established but at a speed lower than the maximum speed supported by the
GBE0_LINK_MID# A4 Ethernet controller. Note that based on capabilities of the Ethernet controller used
this signal might not be active for all possible lower link speeds. Was
GBE0_LINK100# in COM Express Rev. 3.0.
Gigabit Ethernet Controller 0 1000Mbit/sec link indicator, active low.
Gigabit Ethernet Controller MAX Speed Link Indicator. Active low. If active, the link
GBE0_LINK_MAX# A5
is established at the maximum link speed supported by the controller. Was
GBE0_LINK1000# in COM Express Rev. 3.0.
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
GBE0_CTREF A14 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.
Gigabit Ethernet Controller 0 Software-Definable Pin. Can also be used for
GBE0_SDP A49
IEEE1588 support such as 1pps signal.
Note: GBE0_ACT# and GBE0_LINK# share the same pin from LAN controller.
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1000 100 10____
B1_DA+/- TX+/- TX+/-
B1_DB+/- RX+/- RX+/-
B1_DC+/-
B1_DD+/-
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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
GND min Not supported
3.3V max
Depends on the selection
IO 3.3VSB of LAN controller, project
basis
PICMG COM.0 R3.1