LG GB115, Service Manual

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3.1.1 Overview of X-GOLDTM102
The X-GOLDTM102 is a GSM baseband modem including RF transceiver covering the low
bands GSM850 / GSM900 and high bands GSM1800 / GSM1900 bands. X-GOLDTM102 is Dual
Band, therefore, it supports by default a low / high pair of bands at the same time:
1. GSM850 / GSM1800
2. GSM850 / GSM1900
3. GSM900 / GSM1800
4. GSM900 / GSM1900.
The X-GOLDTM102 is optimized for voice-centric Mobile Phone applications.
The X-GOLDTM102 is designed as a single chip solution that integrates the digital, mixed-signal,
RF functionality and a direct-to-battery Power Management Unit.
The transceiver consists of:
• Constant gain direct conversion receiver with an analog I/Q baseband interface
• Fully integrated Sigma/Delta-synthesizer capability
• Fully integrated two-band RF oscillator
• Two-band digital GMSK modulator with digital TX interface
• Digitally controlled crystal oscillator generating system clocks.
The X-GOLDTM102 supports a direct to battery connection, hence eliminating the need for an
external Power Management Unit. The X-GOLDTM102 has different power down modes and an
integrated power up sequencer.
The X-GOLDTM102 is powered by the C166®S-V2 MCU and TEAKLite® DSP cores. The
operating temperature range from -30°C to 85°C. It is manufactured using the 0.13
μ
m CMOS
process.
3.1.2 Features
Baseband
• High performance fixed-point TEAKlite DSP
• C166S-V2 high performance microcontroller with a 16KB Instruction Cache and a Data cache
Buffer.
• There are several Interfaces:
– I2S interface for DAI connections (for Tape Approval) and external Audio component connection.
– High Speed SSC Interface for connection of companion chips (like Serial SD Cards)
– High Speed SSC Interface dedicated to Display control
– USIM Interface with support of Protocol T=1
– Keypad Interface (6x4 or 5x5 keys)
– EBU for external RAM/NOR FLASH/Busrt Flash/NAND Flash/Parallel Display connection
– Asynchronous serial interface.
– Asynchronous serial interface for WLAN/BT/GPS control (incl. IrDA support capability) .
– JTAG Interface, OCDS, Multi-Core Debug and Real Time Trace facilities.
– Black & white and color displays are supported