MSC SM2S-IMX8MINI
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User Manual
Signal
Pin Type
Signal Level
Pin on
i.MX8M Mini
Pin name on
i.MX8M Mini
Power
Tolerance
PU/PD
Description
I2S2_SDIN
I
1.8V CMOS
AG15
SAI1_RXD0
1.8V
Serial TDM data inputs from the codec.
AUDIO_MCK
O PP
1.8V CMOS
H26
CLKOUT1
1.8V
Connected by default.
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
Signal
Pin
Type
Signal Level
Pin on
i.MX8M Mini
Pin name on
i.MX8M Mini
Power Tolerance
PU/PD Description
GB
GBE0_MDI0-
I/O
Analog
n.a.
n.a.
3.3V
Media Dependent Interface Differential Pair 0
Used for the receive pair in 10/100 Mbit/s mode
GB
GBE0_MDI1-
I/O
Analog
n.a.
n.a.
3.3V
Media Dependent Interface Differential Pair 1
Used for the transmit pair in 10/100 Mbit/s mode
GB
GBE0_MDI2-
I/O
Analog
n.a.
n.a.
3.3V
Media Dependent Interface Differential Pair 2
This signal pair is only used for 1000Mbit/s
mode.
GB
GBE0_MDI3-
I/O
Analog
n.a.
n.a.
3.3V
Media Dependent Interface Differential Pair 3
This signal pair is only used for 1000Mbit/s
mode.
GBE0_LINK_ACT#
O OD
3.3V CMOS
n.a.
n.a.
3.3V
Link/Activity Indication, active low and 24mA sink
capability.
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