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USB-AT-based PCIe Version
⚫
Support MBIM/QMI/QRTR/AT
⚫
Support switch back to USB interface by AT command
⚫
Support Non-X86 systems, need to be initiated in X86 system to meet BIOS PCIe early initial
requirement
When RM502Q-GL module works at USB-AT-based PCIe version, it supports MBIM/QMI/QRTR/AT, and
can be switched back to USB version by AT command. But it does not support firmware upgrade by PCIE
interface, therefore RM502Q-GL USB 2.0 interface must be reserved for firmware upgrade.
Please note that the USB-AT-based PCIe version cannot support BIOS PCIe early initial in X86 systems,
but it could be initiated by other module which supports BIOS PCIe early initial. And Non-X86 systems
does not have this problem.
eFuse-based PCIe version
⚫
Support MBIM/QMI/QRTR/AT
⚫
Support Non-X86 Systems and X86 system (could meet BIOS PCIe early initial)
If RM502Q-GL works at eFuse-based PCIe interface by burnt eFuse, the module cannot be switched
back to USB version.
Please note that PCIe firmware upgrade may not be supported on non-Qualcomm AP chips. If the host
does not support firmware upgrade at the PCIe only version, then RM502Q-GL USB 2.0 interface (pins 7
and 9) and two test points (VREG_L6E_1P8 and FORCE_USB_BOOT, reserved on bottom side) must be
used for firmware upgrade. Also, the firmware could be upgraded by the PCIe Card EVB, which could be
inserted into a PC. For more details, please refer to document [1].
3.9. PCM Interface*
RM502Q-GL supports audio communication via Pulse Code Modulation (PCM) digital interface. The PCM
interface supports the following modes:
⚫
Primary mode (short frame synchronization): the module works as both master and slave
⚫
Auxiliary mode (long frame synchronization): the module works as master only
In primary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge. The PCM_SYNC falling edge represents the MSB. In this mode, the PCM interface supports 256
kHz, 512 kHz, 1024 kHz or 2048 kHz PCM_CLK at 8 kHz PCM_SYNC, and also supports 4096 kHz
PCM_CLK at 16 kHz PCM_SYNC.
RM502Q-GL_Hardware_Design
5G Module Series
RM502Q-GL Hardware Design
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