5G Module Series
RM520N-GL_Hardware_Design 29 / 84
3.1.2. Airplane Mode
The module provides a W_DISABLE1# pin to disable or enable airplane mode through hardware
operation. See Chapter 0 for more details.
3.2. Communication Interface with a Host
The module supports to communicate through both USB and PCIe interfaces, respectively referring to the
USB mode and the PCIe mode as described below:
USB Mode
⚫ Supports all USB 2.0/3.1 features
⚫ Supports MBIM/QMI/QRTR/AT over USB interface
⚫ Communication can be switched to PCIe mode by AT command
USB is the default communication interface between the module and the host. To use PCIe interface for
the communication between a host, an AT command under USB mode can be used. For more details
about the AT command, see document [3].
It is suggested that USB 2.0 interface be reserved for firmware upgrade.
USB-AT-based PCIe Mode
⚫ Supports MBIM/QMI/QRTR over PCIe interface
⚫ Supports AT over USB interface
⚫ Communication can be switched back to USB mode by AT command
When the module works at the USB-AT-based (switched from USB mode by AT command) PCIe mode, it
supports MBIM/QMI/QRTR/AT, and can be switched back to USB mode by AT command.
For USB-AT-based PCIe mode, the firmware upgrade via PCIe interface is not supported, so USB 2.0
interface must be reserved for the firmware upgrade.
eFuse-based PCIe Mode
⚫ Supports MBIM/QMI/QRTR/AT over PCIe interface
⚫ Supports Non-X86 systems and X86 system (supports BIOS PCIe early initial)
RM520N-GL can also be reprogrammed to PCIe mode based on eFuse. If switched to PCIe mode by
burnt eFuse, the communication cannot be switched back to USB mode.
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