Seco Qseven Q7-974 User Manual page 30

3.2.3.3 Gigabit Ethernet signals
The Gigabit Ethernet interface is realised, on Q7-974 module, using an Intel
through PCI-express lane #3.
Here following the signals involved in PCI express management
GBE_MDI0+/GBE_MDI0-: Media Dependent Interface (MDI) I/O differential pair #0
GBE_MDI1+/GBE_MDI1-: Media Dependent Interface (MDI) I/O differential pair #1
GBE_MDI2+/GBE_MDI2-: Media Dependent Interface (MDI) I/O differential pair #2, only used for 1Gbps Ethernet
mode (not for 10/100Mbps modes)
GBE_MDI3+/GBE_MDI3-: Media Dependent Interface (MDI) I/O differential pair #3, only used for 1Gbps Ethernet
mode (not for 10/100Mbps modes)
GBE_ACT#: Ethernet controller activity indicator, Active Low Output signal, electrical level +3.3V_A.
GBE_LINK#: Ethernet controller link indicator, Active Low Output signal, electrical level +3.3V_A.
GBE_LINK100#: Ethernet controller 100Mbps link indicator, Active Low Output signal, electrical level +3.3V_A.
GBE_LINK1000#: Ethernet controller 1Gbps link indicator, Active Low Output signal, electrical level +3.3V_A.
These signals can be connected, on the Carrier board, directly to an RJ-45 connector, in order to complete the
Ethernet interface.
Please notice that if just a FastEthernet (i.e. 10/100 Mbps) is needed, then only MDI0 and MDI1 differential lanes are necessary.
Unused differential pairs and signals can be left unconnected. Please look to the schematic on the left as an example of implementation of Gigabit Ethernet
connector. In this example, it is also present GBE_CTREF signal connected on pin #2 of the RJ-45 connector. Intel
doesn't need the analog powered centre tap, therefore the signal GBE_CTREF is not available on Qseven
Q7-974
Q7-974 User Manual - Rev. First Edition: 0.1 - Last Edition: 2.3 - Author: S.B. - Reviewed by G.G. Copyright © 2017 SECO S.r.l.
®
I210 Gigabit Ethernet controller, which is interfaced to Intel
®
golden finger connector
®
Atom E38xx SOCs
D2
R1 R-249
GBE_LINK1000#
G
Y
D1
R2 R-249
GBE_LINK100#
2
GBE_CTREF
9
GBE_MDI0+
10
GBE_MDI0-
0.1uF
7
GBE_MDI1+
8
GBE_MDI1-
0.1uF
5
GBE_MDI2+
6
GBE_MDI2-
0.1uF
3
GBE_MDI3+
4
GBE_MDI3-
0.1uF
1
D4
R3 R-249
GBE_ACT#
G
Y
D3
R4 R-249
GBE_LINK#
LPJG16314A4NL
®
I210 Gigabit Ethernet controller, however,
CN1
1
75
2
3
75
6
4
75
5
7
75
8
1000pF
2kV
SHIELD GND
30