The device can transmit and receive USB data at high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-
speed (1.5Mbit/s). The USB connection is implemented using D5300 ULPI high-speed USB transceiver and the
ULPI interface from Application IC D4800. ULPI (UTMI low pin interface) is a 12-pin interface standard for
connecting USB core logic to a USB transceiver. External interface is the USB-B connector. The interface
between D5300 USB transceiver and USB connector is a standard USB interface specified in Universal Serial
Bus specification Rev. 2.0. The USB transfers signal and power over four-wire interface, which carries
differential data, Vbus and GND. Signalling occurs over differential data line D+ and D-. The clock is transmitted
encoded along with the differential data. ESD protection is done with USB ASIP V5300. VBUS (+5V) is provided
by the host device.
Figure 50 Block diagram of high-speed USB connection
The SIM (Subscriber Identification Module) interface is located in two ASICs; Cellular Modem ASIC D2800
contains most of the interface functionality and the mixed signal ASIC N2200 takes care of power up/down,
card detect, ATR counting and level shifting. ESD protection components are integrated to N2200 ASIP.
Figure 51 SIM interface
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