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i.MX8 SMARC SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
Signal
SMARC Pin
(Top)
SMARC Pin
(Bottom)
Signal
UART4_TX P140 S141 LCD0_BL_PWM(GPIO1_04)
UART4_RX P141 S142 NC
(Note: Optionally GPIO_12(GPIO2_24))
GND P142 S143 GND
FLEXCAN0_TX P143 S144 DSI0_TE(GPIO3_25)
FLEXCAN0_RX P144 S145 NC ( Note: Optionally SCU_WDOG_OUT)
FLEXCAN1_TX P145 S146 PCIE_A_WAKE_B(GPIO4_28)
FLEXCAN1_RX P146 S147 VDD_RTC
VDD_IN P147 S148 NC
VDD_IN P148 S149 NC
VDD_IN P149 S150 VIN_PWR_BAD#
VDD_IN P150 S151 NC
VDD_IN P151 S152 NC
VDD_IN P152 S153 CARRIER_STBY#
VDD_IN P153 S154 CARRIER_PWR_ON
VDD_IN P154 S155 FORCE_RECOV#
VDD_IN P155 S156 NC
VDD_IN P156 S157 TEST_MODE_SELECT
S158 GND
2.7.1 Gigabit Ethernet
The i.MX8 QM/QP SMARC SOM supports two Gigabit Ethernet using two on SOM Ethernet PHY “ AR8031 ” from
Atheros, Qualcomm. ENET0 and ENET1 of i.MX8 are connected to GBE0 and GBE1 ports of SMARC edge connector
respectively. The AR8031 integrates Atheros Green ETHOS® power saving technologies and significantly saves power
not only during the work time, but also overtime. Atheros Green ETHOS® power savings include ultra-low power in
cable unplugged mode or port power down mode, and automatic optimized power saving based on cable length. The
AR8031 also supports IEEE 802.3az EEE standard (Energy Efficient Ethernet) and Atheros proprietary SmartEEE.
SmartEEE allows legacy MAC/SoC devices without 802.3az support to function as a complete 802.3az system. Further,
the AR8031 supports Wake-on-LAN (WoL) feature to be able to help manage and regulate total system power
requirements.
For more details on GBE0 pinouts, refer below Table:
SMARC
Pin No. SMARC Edge Signal
Name
CPU Ball Name/
Pin Number
Signal Type/
Termination
Description
P6 GBE0_PPS_SDP NA IO, 3.3V CMOS NC.
Note: Optionally connected to
GBE0_PPS_SDP
P19 GBE0_MDI3- NA IO, GBE Gigabit Ethernet MDI differential pair
3 negative.