SBC-C90
SBC-C90 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by C.M. Copyright © 2021 SECO S.p.A.
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SD_DATA[0÷3]: SD Card data bus. SD_DATA0 signal is used for all communication modes. SD_DATA[1÷3] signals are required for 4-bit communication mode.
SDIO_VDD: +3.3V_RUN SD dedicated Power rail
3.3.12
Gigabit Ethernet connectors
On board, there are two Gigabit Ethernet connectors, for the direct connection of the SBC-C90
to two different wired LANs.
The Ethernet connection is managed directly by the Soc, through the 2x PCI-e x1 interfaces,
plus two dedicated Gigabit Ethernet Transceivers.
First connection is available on connector CN21, and is always available, The
second connection, available on RJ-45 connector CN22, instead, is available
only as a factory option
This interface is compatible both with Gigabit Ethernet (1000Mbps) and with Fast Ethernet
(10/100Mbps) Networks. They will configure automatically to work with the existing network.
Please be aware that it will work in Gigabit mode only in case that it is 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.
Placed behind each GbE connector there are also two bicolour Green/Yellow LEDs, signaling
100Mbps (green LED) / 1Gbps (yellow LED) connection and ACTIVITY presence (green LED).
GB/GBEx_MDI0-: Ethernet Controller #x 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.
GB/GBEx_MDI1-: Ethernet Controller #x 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.
GB/GBEx_MDI2-: Ethernet Controller #x 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.
GB/GBEx_MDI3-: Ethernet Controller #x 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
Gigabit Ethernet Port #1 CN21
Pin Signal
Pin Signal
1
GB
5
GBE1_MDI2-
2
GBE1_MDI0-
6
GBE1_MDI1-
3
GB
7
GB
4
GB
8
GBE1_MDI3-
Optional Gigabit Ethernet Port #2 CN22
Pin
Signal
Pin
Signal
1
GB
5
GBE2_MDI2-
2
GBE2_MDI0-
6
GBE2_MDI1-
3
GB
7
GB
4
GB
8
GBE2_MDI3-
