Product Info

LTE-A Module Series
EM121R-GL Hardware Design
EM121R-GL Hardware Design 27 / 80
3.1.2. Airplane mode
The module provides a W_DISABLE1# pin to disable or enable airplane mode through hardware
operation. See Chapter 4.5.1 for more details.
3.2. Communication Interface with the 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
⚫ Support all USB 2.0/3.0 features
⚫ Support MBIM/QMI/QRTR/AT
USB is the default communication interface between the module and the host. It is suggested that USB
2.0 interface be reserved for firmware upgrade.
PCIe Mode (eFuse-based)
⚫ Support MBIM/QMI/QRTR/AT
⚫ Support Non-X86 systems and X86 system (support BIOS PCIe early initial)
EM121R-GL can also be reprogrammed to PCIe mode based on eFuse. If the communication is switched
to PCIe mode by burnt eFuse, the communication cannot be switched back to USB mode.
3.3. Power Supply
The following table shows pin definition of VCC pins and ground pins.
Table 7: Definition of VCC and GND Pins
Pin No.
Pin Name
I/O
Description
DC Characteristics
2, 4, 70, 72, 74
VCC
PI
Power supply
3.135–4.4 V
3.7 V typical DC supply
3, 5, 11, 27, 33, 39,
45, 51, 57, 71, 73
GND
-
Ground
-