REL0.1
Page 26 of 52
Snapdragon 820 SMARC SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
Pin
No.
SMARC Edge
Connector Pin Name
Signal Name
CPU Ball Name/
Pin Number
Signal Type/
Termination
Description
P70
USB2-
USB_HUB1OUT_
DM
NA
IO, DIFF
USB Port2 Data Negative
Note: Connected to USB Hub
P71
USB2_EN_OC#
USB_HUB1_OC
NA
IO, 3.3V CMOS
USB Port2 Power Enable/
Over Current Indicator
Note: Connected to USB Hub
P72
RSVD4
NC
NA
NA
NA
P73
RSVD5
NC
NA
NA
NA
P74
USB3_EN_OC#
USB_HUB2_OC
NA
IO, 3.3V CMOS
USB Port3 Power Enable/
Over Current Indicator
Note: Connected to USB Hub
P75
PCIE_A_RST#
PCIe1_RST_N(G
PIO_130)
GPIO_130/
C3
O, 3.3V CMOS
PCIE_A RESET Out
Note: Connected via 1.8 to
3.3V level Translator
P76
USB4_EN_OC#
USB_HUB4_OC
NA
IO, 3.3V CMOS
USB Port4 Power Enable/
Over Current Indicator
Note: Connected to USB Hub
P77
RSVD6
NC
NA
NA
NA
P78
RSVD7
NC
NA
NA
NA
P79
GND
GND
NA
Power
Ground.
P80
PCIE_
NC
NA
NA
NC
Note: Optionally connected
to PCIE0_REFCLK_P
P81
PCIE_C_REFCK-
NC
NA
NA
NC
Note: Optionally connected
to PCIE0_REFCLK_M
P82
GND
GND
NA
Power
Ground.
P83
PCIE_
PCIE1_REFCLK_
P
PCIE1_REFCLK_P/
AK4
O, Diff
PCIE1 Clock Positive
P84
PCIE_A_REFCK-
PCIE1_REFCLK_
M
PCIE1_REFCLK_M/
AL3
O, Diff
PCIE1 Clock Negative
P85
GND
GND
NA
Power
Ground.
P86
PC
PCIE1_RX_P
PCIE1_RX_P/
AK2
I, Diff
PCIE1 Receive Positive
P87
PCIE_A_RX-
PCIE1_RX_M
PCIE1_RX_M/
AJ3
I, Diff
PCIE1 Receive Negative
P88
GND
GND
NA
Power
Ground.
P89
PC
PCIE1_TX_P
PCIE1_TX_P/
AH2
O, Diff/
0.1uF AC
Couple
PCIE1 Transmit Positive
P90
PCIE_A_TX-
PCIE1_TX_M
PCIE1_TX_M/
AJ1
O, Diff/
0.1uF AC
Couple
PCIE1 Transmit Negative