SBC-C43
SBC-C43 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by S.R. -Copyright © 2020 SECO S.p.A.
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Gigabit Et USB Connectors
On SBC-C43 board it is possible to have up to two Gigabit Ethernet connectors, managed using as many DP83867CR GbE Transceivers.
Each one of these optional connections is available on a combo connector, where the GbE interface is coupled to an USB interface.
More specifically, on connector CN52, type TRXCOM p/n TRJU3836B81N, with 2kV decoupling capacitors, it is available GbE LAN port #1 along
with USB 2.0 downstream port #3, managed by the USB HSIC Hub.
Signals description:
/USB_P3-: USB Port #3 differential pair; it is managed by Microchip USB4604 Hub
+5V
USB3
voltage is derived from +5V_ALW power rail using a 600mA power switch.
ET/ETH1_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.
ET/ ETH1_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.
ET/ ETH1_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.
ET/ ETH1_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.
On the connector there are also two LEDs for each port. Left LED is bicolor (Orange / Green) and
shows 10/100 or 1000 connection: orange means 100Mbps connection, green means
1000Mpbs connection, when the LED is Off then 10Mpbs or no connection is available. The right
LED is Yellow and shows ACTIVITY presence.
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.
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.
Combo GbE #1 + USB 2.0 connector CN52
Pin Signal
U1
+5V
USB3
U2
USB_P3-
U3
U4
GND
E1
ET
E2
ETH1_MDI0-
E3
ET
E4
ET
E5
ETH1_MDI2-
E6
ETH1_MDI1-
E7
ET
E8
ETH1_MDI3-
