User Guide

High-speed USB

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 external interface is the micro-B connector X3300. The interface between D3300 USB

transceiver and micro-B receptacle is the standard USB interface specified in the 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 Z3300. VBUS (+5V) is provided by the

host device. The circuit is protected from an overvoltage condition by transistor pair V3300 and reference

zenner diode V3301.

CBUS interface

CBUS is a "main" system control bus in BB5. RAPIDO controls the functionality of EM ASICs AVilma (N2200) and

Betty (N2300) with CBUS.

CBUS is a four-wire half-duplex master-slave interface. In HW53 CBUS clock frequency is 4.39 MHz.

FBUS interface

FBUS is a 2-wire serial communication bus between HW53 engine and service SW.

ECI interface

The ECI (Enhancement Control Interface) is a point-to-point, bi-directional, single line serial bus.

The purpose of the ECI is to identify and authenticate the accessory, and to act as a data bus (intended for

control purposes) between the phone and the accessory .

Charger interface

Charging control and charge switch are situated in EM ASIC (N2300).

If the temperature rises too high and the thermal protection is activated, EM ASIC (N2300) goes to protection

mode.

SIM interface

The device has one SIM (Subscriber Identification Module) interface. It is only accessible if battery is removed.

The SIM interface consists of an internal interface between RAPIDO and EM ASIC (N2200), and of an external

interface between N2200 and SIM contacts.

The SIM IF is shown in the following figure:

RM-348; RM-349; RM-350

System Module and User Interface

Issue 2 COMPANY CONFIDENTIAL Page 8 –13