MSC SM2S-IMX8MINI 28 / 87
User Manual
Serial TDM data inputs from the codec.
4.2 Ethernet
Based on Texas Instruments™ DP83867 Ethernet Controller the module provides 10/100/1000 Mbps Ethernet with MDI differential pairs on GBE0
Interface.
The module provides a second 10/100/1000 Mbps Ethernet option (GBE1 interface) based on Intels ™ I210 Ethernet Controller. In case GBE1 interface
is implemented PCIe will no longer be available. PCIE_A and GBE1 are mutually exclusive assembly options.
Both Ethernet Controllers include a voltage mode line driver, so using an analog powered center tap is not allowed. Therefore Pin P28 GBE0_CTREF
and S28 GBE1_CTREF specified in the SMARC™ specification 2.0 are not connected on the module and can be left unconnected.
Both Ethernet Controller have built in termination resistors. As a result, no external termination resistors should be used. Please refer to the
DP83867EVM schematics for correct magnetics wiring. Each Center tap of the magnetics should be independently de-coupled to ground via a 0.1µF
capacitor.
Table 7: Ethernet Signal Description
Media Dependent Interface Differential Pair 0
Used for the receive pair in 10/100 Mbit/s mode
Media Dependent Interface Differential Pair 1
Used for the transmit pair in 10/100 Mbit/s mode
Media Dependent Interface Differential Pair 2
This signal pair is only used for 1000Mbit/s
mode.
Media Dependent Interface Differential Pair 3
This signal pair is only used for 1000Mbit/s
mode.
Link/Activity Indication, active low and 24mA sink
capability.
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