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Part 6: Logic Circuit Description
This section describes the architecture and hardware functionality of the logic
circuit. The logic circuit performs the following functions:
• Channel coding/ decoding
• Speech coding / decoding
• Data encryption
• Layer 1,2 and 3 software tasks
• I/O System interface
• SIM interface and management
• Audio and tone control
• Vibrator control
• Power supply and battery management
• RF power control
• Synchronisation
• Real time clock
• Key-Pad control and scanning
• LCD control and driver
The logic and RF circuits are primarily controlled and administered by two main
devices, these being:-
• "Superchip"- CSP and DSP Combined (IC27)
The "Superchip" combines the functions of both the CSP and DSP in a single
package. The device performs channel and speech coder/decoder tasks,
equalisation, encryption, frame timing, A/D conversion, RF power control
and audio interfacing, including tone generation.
• Nell - (IC8)
Nell incorporates the main CPU for the mobile and controls the functions;
Layer 1,2 and 3 software, the SIM, system interfaces, real time clock, buzzer,
vibrator, battery management, Key-Pad scanning and LCD control. Nell also
controls the integrated power supply devices:- "MiniMoe" and "MicroMoe" .
The Logic circuit is divided into six main functional areas:
1) Superchip (CSP and DSP combined)
2) Nell and CPU Memory
3) Battery Interface and Power Supply
4) Keypad, Display and SIM
5) Audio and Miscellaneous Interfaces
6) System Connector - P5
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