Table of Contents
Advertisement
should pay attention to the selection of the device. Typically, the stray capacitance should be less
than 1.0 pF for USB 2.0, and less than 0.15 pF for USB 3.1.
⚫
Keep the ESD protection devices as close to the USB connector as possible.
⚫
If possible, reserve 0 Ω resistors on USB_DP and USB_DM lines respectively.
4.3. PCIe Interface
RM502Q-GL provides one integrated PCIe (Peripheral Component Interconnect Express) interface.
⚫
PCI Express Base Specification Revision 3.0 compliant
⚫
Data rate up to 8 Gbps per lane
4.3.1. PCIe Operating Mode
RM502Q-GL supports endpoint (EP) mode and
configured as a PCIe EP device. In RC mode, the module is configured as a PCIe root complex.
AT+QCFG="pcie/mode" is used to set PCIe RC/EP mode.
AT+QCFG="pcie/mode" Set PCIe RC/EP Mode
Write Command
AT+QCFG="pcie/mode"[,<mode>]
Maximum Response Time
Characteristics
Parameter
<mode>
Integer type. Set PCIe RC or EP mode.
0
1
RM502Q-GL_Hardware_Design
Response
If the optional parameter is omitted, query the current setting:
+QCFG: "pcie/mode",<mode>
OK
If the optional parameter is specified, set PCIe RC/EP mode:
OK
If there is any error:
ERROR
300 ms
The command takes effect after the module is restarted.
The configuration will be saved automatically.
PCIe EP mode.
PCIe RC mode.
RM502Q-GL Hardware Design
root complex
(RC) mode. In EP mode, the module is
5G Module Series
42 / 83
Advertisement
Table of Contents
