Copyright
©
2012
congatec
AG
TCEDm10
41/94
Table 4
Gigabit Ethernet Signal Descriptions
Gigabit Ethernet 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:
I/O Analog
Twisted pair
signals for
external
transformer.
1000
100
10
MDI[0]+/-
B1_DA+/-
TX+/-
TX+/-
MDI[1]+/-
B1_DB+/-
RX+/-
RX+/-
MDI[2]+/-
B1_DC+/-
MDI[3]+/-
B1_DD+/-
GBE0_ACT#
B2
Gigabit Ethernet Controller 0 activity indicator, active low.
O 3.3VSB
GBE0_LINK#
A8
Gigabit Ethernet Controller 0 link indicator, active low.
O 3.3VSB
GBE0_LINK100#
A4
Gigabit Ethernet Controller 0 100Mbit/sec link indicator, active low.
O 3.3VSB
GBE0_LINK1000# A5
Gigabit Ethernet Controller 0 1000Mbit/sec link indicator, active low.
O 3.3VSB
GBE0_CTREF
A14
Reference voltage for Carrier Board Ethernet channel 0 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 limited to 250mA or less.
Not connected
Note
The GBE0_LINK# output is only active during a 100Mbit or 1Gbit connection, it is not active during a 10Mbit connection. This is a limitation
of Ethernet controller since it only has 3 LED outputs, ACT#, LINK100# and LINK1000#. The GBE0_LINK# signal is a logic AND of the
GBE0_LINK100# and GBE0_LINK1000# signals on the conga-TCA module.