User's Manual

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L850-GL Hardware User Manual Page
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3.5 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.
3.5.1 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
PE-Reset is a functional reset to the Add-In
card as defined by the PCIe Mini Card CEM
specification
CMOS 3.3V
52
CLKREQ#
O
T
Clock Request is a reference clock request
signal as defined by the PCIe Mini Card CEM
specification; Also used by L1 PM Substates
CMOS 3.3V
54
PEWAKE#
O
L
PCIe PME Wake. Open Drain with pull up on
platform,active low
CMOS 3.3V
3.5.2 PCIe Interface Application
The reference circuit is shown in Figure 3-9: