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L850-GL Hardware User Manual Page 30 of 54
3.4 PCIe & USB
L850 module supports PCIe and USB interface for data request. PCIe & USB interface functions are as
below table:
Interface System Priority Description
PCIe Win10 High
Priority: PCIe>USB.
If PCIe and USB ports connected both with PC, module will initial
PCIe first, then disable USB port
USB Android/Linux Low
It must disconnect PCIe port, only keep USB connecting.
If keep PCIe and USB connecting both, it needs disable PCIe by
BIOS/UEFI of PC
3.4.1 PCIe Interface
L850 module supports PCIe 1.0 interface and one data transmission channel.
After L850 module is inserted into PC, PCIe interface can, work with the drive program, map an MBIM
port and a GNSS port in Win10 system. While MBIM interface is used for initiating data service in Win10
system and GNSS interface for receiving GNSS data.
3.4.1.1 PCIe Interface Definition
Pin# Pin Name I/O Reset Value Description Type
41 PETn0 O -
PCIe TX Differential signals
Negative
-
43 PETP0 O -
PCIe TX Differential signals Positive
-
47 PERn0 I -
PCIe RX Differential signals
NegativeBit0
-
49 PERP0 I -
PCIe RX Differential signals Positive
-
53 REFCLKN I -
PCIe Reference Clock signal
Negative
-
55 REFCLKP I -
PCIe Reference Clock signal
Positive
-
50 PERST# I T
Asserted to reset module PCIe interface
default. If module went into coredump, it will
reset whole module, not only PCIe interface.
Active low, internal pull up(10KΩ)
CMOS 3.3V
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