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FIBOCOM_NL952-NA_Hardware_User_Manual
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Correct match
Dismatched end
Incorrect match
Matched end
Figure 3-14 Length Match Design of PCIe Difference Pair
USB Interface
The NL952 module supports USB2.0 which is compatible with USB High-Speed (480 Mbit/s) and USB
Full-Speed (12 Mbit/s).It supports USB3.0 using for LTE cat12 high speed data throughput at the same
time. For the USB timing and electrical specification of NL952 module, please refer to Universal Serial Bus
Specification 2.0” and “Universal Serial Bus Specification 3.0”.
USB3.0 interface initialized with host driver, then mapped RMNET & AT port in Chrome/Linux/Android OS.
The RMNET interfaces are used for data transfer, AT port is used for AT command. The port can be
configured in practical application.
3.4.2.1 USB Interface Definition
Pin#
Pin Name
I/O
Description
Type
7
USB_D+
I/O
USB Data Plus
0.3---3V,
USB2.0
9
USB_D-
I/O
USB Data Minus
0.3---3V,
USB2.0
29
USB3.0_TX-
O
USB3.0 Transmit data minus
-
31
USB3.0_TX+
O
USB3.0 Transmit data plus
-
35
USB3.0_RX-
I
USB3.0 receive data minus
-
37
USB3.0_RX+
I
USB3.0 receive data plus
-
3.4.2.2 USB2.0 Interface Application
The reference circuit is shown in Figure 3-15: