
MSC SM2S-IMX8M User Manual
30 / 92
Signal
Pin Type
Signal
Level
Pin on
i.MX8
Pin name on i.MX8M
Power
Tolerance
PU/PD
Description
PCIE_WAKE#
I
3.3V
CMOS
A3
SAI1_MCLK
3.3V
PU 10k
PCI Express Wake signal. Asserted by
device when requesting wake up.
(CPU GPIO4_IO20)
NOTE:
PCIE_A_RST# and PCIE_B_RST# share same CPU pin.
4.4 USB
The USB controller supports USB 3.0 and USB 2.0.
Depending on the module variant different number of USB lanes are available:
Option 1
with USB 3.0 Hub:
USB[0] = USB 2.0 host/device OTG compliant
USB[1] = USB 2.0 host
USB[2:3] = USB 3.0 host
USB[4] = USB 2.0 host.
Option 2
without USB 3.0 Hub:
USB[0] = USB 2.0 host/device OTG compliant
USB[1] = USB 2.0 host.
Table 4-4: USB Signal Description
Signal
Option
Availability
Pin Type
Signal Level
Pin on
i.MX8M
Pin name on
i.MX8M
Power
Toleranc
e
PU/PD
Description
USB0+
USB0-
1 & 2
I/O
USB
A14
B14
USB1_DP
USB1_DN
3.3V
Differential USB 2.0 data pairs
connected to SoC. Can be
configured as host or device.