LG GB115, Service Manual

Page: 17 / 142

17
The X-GOLDTM102 performs speech and channel encoding (including voice activity detection
(VAD) and
discontinuous transmission (DTX)) and digital GMSK modulation.
In the RF transceiver part, the baseband signal modulates the RF carrier at the desired frequency
in the 850 MHz,
900 MHz, 1.8 GHz, and 1.9 GHz bands using an I/Q modulator. The X-GOLDTM102 supports dual
band
applications.
Finally, an RF power module amplifies the RF transmit signal at the required power level. Using
software, the
X-GOLDTM102 controls the gain of the power amplifier by predefined ramping curves (16 words,
11 bits).
For baseband operation, the X-GOLDTM102 supports:
• High Speed Circuit Switched Data (HSCSD) class 4
• Packet-oriented data (GPRS) class 4 with a coding scheme from 1 to 4. It provides fixed, dynamic,
and extended dynamic modes.
If the X-GOLDTM102 is only used as a modem, then it supports:
• High Speed Circuit Switched Data (HSCSD) class 10
• Packet-oriented data (GPRS) class 10 with coding schemes from 1 to 4. It provides fixed,
dynamic, and extended dynamic modes.
The X-GOLDTM102 can support Class B operation. The mobile phone can be attached to both
GPRS and GSM services (one service at a time). During a GPRS connection Class B enables
either:
• Making or receiving a voice call
• Sending or receiving an SMS.
During voice calls or SMS, GPRS services are suspended and then resumed automatically after
the call or SMS session has ended.
3.1.5 Bus Concept
The X-GOLDTM102 has two cores (a microcontroller and a DSP), each with its own bus.
There is an Shared memory interconnection between the TEAKlite bus and the C166S-V2 X-Bus.
C166S-V2 Buses
The C166S-V2 is connected to four buses:
1. IMB (Internal Program) bus
2. DPMI (Data-Program) Bus
3. X-Bus
4. PD-Bus.
TEAKLite Bus
The TEAKlite is connected to the TEAKlite bus.