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3.3 Connectors description
JTAG Connector
JTAG Connector
Pin
Signal
Pin
1
VDD 3P3V
5
2
JTAG_TCK
6
3
JTAG_TMS
7
4
JTAG_TDI
Ethernet Connector
On board there is an Ethernet Interface 10Base-T/100Base-Tx/1000Base-Tx Transceivers interfaced to NXP processor's eNET interface.
GbEthernet RJ-45 connector
Pin Signal
Pin Signal
1
ETH_MDI0+
5
2
ETH_MDI0-
6
3
ETH_MDI1+
7
4
ETH_MDI2+
8
ETH_MDI0+/ETH_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.
ETH _MDI1+/ ETH _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.
ETH _MDI2+/ ETH _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.
SBC-C20
SBC-C20 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R. - Reviewed by C.M. -Copyright © 2020 SECO S.p.A.
SBCC20 board is equipped with a connector reporting the JTAG signals
CN2
coming from the i.MX8 processor, which can be useful for software
debugging and tracing in development phase. This connector is a 7-pin
Signal
single row male connector, type JST P/N SM07B-SRSS-TB or equivalent. Mating connector: JST
JTAG_TDO
07SR-3S receptacle with JST SSH-003T-P0.2-H female crimp terminals.
JTAG_TRST_B
All these JTAG signals are directly connected to i.MX8 pins with same name. Please refer to i.MX8
GND
Connector is type TRXCOM p/n TRJG16314CNL or equivalent, with 2kV
CN3
decoupling capacitor, 100 Ohm impedance.
This interface is compatible both with Gigabit Ethernet (1000Mbps) and
with Fast Ethernet (10/100Mbps) Networks. It will configure automatically
ETH_MDI2-
to work with the existing network.
ETH_MDI1-
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
ETH_MDI3+
required. Cables category Cat6 are recommended for noise reduction and EMC compatibility
ETH_MDI3-
issues, especially when the length of the cable is significant.
documentation for a description of the signals and their usage
22
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