Seco Smarc CSM-B79 User Manual page 49

3.3.11 Gigabit Ethernet connectors
Gigabit Ethernet Ports #0 #1- CN27
Pin Signal Pin
A1 GBE0_MDI0+
A2 GBE0_MDI0-
A3 GBE0_MDI1+
A4 GBE0_MDI2+
B1 GBE1_MDI0+
B2 GBE1_MDI0-
B3 GBE1_MDI1+
B4 GBE1_MDI2+
Gigabit Ethernet Ports #2 #3 - CN28
Pin Signal Pin
A1 GBE2_MDI0+
A2 GBE2_MDI0-
A3 GBE2_MDI1+
A4 GBE2_MDI2+
B1 GBE3_MDI0+
B2 GBE3_MDI0-
B3 GBE3_MDI1+
B4 GBE3_MDI2+
CSM-B79
CSM-B79 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.1 - Author: A.R - Reviewed by S.R. - Copyright © 2021 SECO S.p.A.
Signal
A5 GBE0_MDI2-
A6 GBE0_MDI1-
A7 GBE0_MDI3+
A8 GBE0_MDI3-
B5 GBE1_MDI2-
B6 GBE1_MDI1-
B7 GBE1_MDI3+
B8 GBE1_MDI3-
Signal
A5 GBE2_MDI2-
A6 GBE2_MDI1-
A7 GBE2_MDI3+
A8 GBE2_MDI3-
B5 GBE3_MDI2-
B6 GBE3_MDI1-
B7 GBE3_MDI3+
B8 GBE3_MDI3-
®
According to SMARC Rel. 2.1.1 specification, SMARC
Ethernet interfaces, including GbE MAC and PHY.
Only the isolation magnetic (with a 1:1 turn ratio) is required.
For this reason, on board there is a double port RJ-45 socket
CN27, type TRXCOM p/n TRJG27420AINL or equivalent, with
2kV decoupling capacitors.
According to SMARC ® Rel 2.1.1 specification, SMARC
and DESerialized signals on a high-speed differential line) interfaces to implement additional
LAN ports.
On CSM-B79 carrier board, SERDES0 and SERDES1 interfaces are utilized to connect an
SGMII PHY to the interface. For this reason, there is a Gigabit Ethernet Physical Layer
Transceiver, type Texas Instrument p/n DP83867CSRGZR, connected to the SERDES1
®
coming from SMARC module, used to implement Gigabit Ethernet Ports #2. Another PHY
transceiver, connected to SERDES0, is used to implement Gigabit Ethernet Ports #3.
For this reason, on board there is another double port RJ-45 socket CN28 type TRXCOM p/n
TRJG27420AINL or equivalent, with 2kV decoupling capacitors.
In order to support SERDES interfaces used for Gigabit Ethernet Ports #2 #3, it is necessary to
configure properly 1-3 position of the dual DIP switch SW17, type ADIMPEX p/n KVT04602-R,
according to the table below.
SW17 position PCIe routing selector
ON position (1-3) SERDES0 / SERDES1
OFF position (1-3) PCIe #C, #D to PCI-e x4 slot CN33
ON position (2-4) PCIe #A, #B to M.2 Key E Slot CN36 (PCIe #B) and M.2 Key B Slot CN38 (PCIe #A)
OFF position (2-4) PCIe #A, #B to PCI-e x4 slot CN33
®
module offers up to two Gigabit
® module can use SERDES (SERialized
49