High-Speed Usb; Cbus Interface; Fbus; Eci Interface - Nokia MOBILE TERMINAL Service Manual

RM-356
System Module and User Interface
The FM radio is an integrated circuit, controlled by MCU software through a serial bus interface. The wires of
the headset are used as elements of the antenna, and no other antenna is needed for FM radio reception.
The radio has an automatic band search function, which can search for a strong station.

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 USB connection is implemented using D3300 ULPI high-speed USB transceiver and the ULPI interface from
Cellular ASIC D2800. External interface is the micro B connector X3300.
The interface between D3300 USB transceiver and micro B receptacle is 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 Z3300. VBUS (+5V) is provided by the host device.

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 HW51 CBUS clock frequency is 4.39 MHz.

FBUS

USB and FBUS have multiplexed interface between EM ASIC (2300) and RAPIDO.

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:
Issue 1
Figure 56 Micro B receptacle
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