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3.3.3 Ethernet connector
Gigabit Ethernet Port - CN2
Pin
Signal
Pin
1
GBE0_MDI0+
2
GBE0_MDI0-
3
GBE0_MDI1+
4
GBE0_MDI2+
connection is available. LED2 (Right LED) is not working.
This interface is compatible both with Gigabit Ethernet (1000Mbps) and with Fast Ethernet (10/100Mbps) Networks. It will configure automatically to work with the
existing network. Theoretical maximum speed of 1Gbps, however, cannot be reached, due to a known limitation of i.MX6 Gb Ethernet MAC (ENET), which is
limited only to 470Mbps (also check NXP Errata ERR004512 for i.MX6 processors).
Please be aware that they will work in Gigabit mode only in case that they are connected to Gigabit Ethernet switches/hubs/routers. For the connection, cables
category Cat5e or better are required. Cables category Cat6 are recommended for noise reduction and EMC compatibility issues, especially when the length of
the cable is significant.
GBE0_MDI0+/GBE0_MDI0-: Ethernet Controller Media Dependent Interface (MDI) I/O differential pair #0. It is the first differential pair in Gigabit Ethernet mode, and
the Transmit differential pair in 10/100 Mbps modes.
GBE0_MDI1+/GBE0_MDI1-: Ethernet Controller Media Dependent Interface (MDI) I/O differential pair #1. It is the second differential pair in Gigabit Ethernet mode,
and the Receive differential pair in 10/100 Mbps modes.
GBE0_MDI2+/GBE0_MDI2-: Ethernet Controller Media Dependent Interface (MDI) I/O differential pair #2. It is the third differential pair in Gigabit Ethernet mode; it is
not used in 10/100Mbps modes.
GBE0_MDI3+/GBE0_MDI3-: Ethernet Controller Media Dependent Interface (MDI) I/O differential pair #3. It is the fourth differential pair in Gigabit Ethernet mode; it
is not used in 10/100Mbps modes.
SBC-984
SBC-984 User Manual - Rev. First Edition: 1.0 - Last Edition: 4.0 - Author: S.B. - Reviewed by N.P. Copyright © 2016 SECO S.r.l.
On board, there is one Gigabit Ethernet connector, made
available by a Micrel KSZ9031RN Gigabit Ethernet Transceiver
interfaced to NXP processor's RGMII interface.
Signal
Connector is type LINK-PP p/n LPJG16314A4NL or
5
GBE0_MDI2-
equivalent, with 2kV decoupling capacitor, 100 Ohm
6
GBE0_MDI1-
impedance.
7
GBE0_MDI3+
On the connectors there are also two bicolor Green/Yellow
LEDs: LED1 (Left LED) shows 10/100 or 1000 connection: yellow means 100Mbps
8
GBE0_MDI3-
connection, green means 1000Mpbs connection, when the LED is Off then 10Mpbs or no
25
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