Only For Training And Service Purposes - LG GU280 Service Manual

3.6.5 Air interfaces
The supported air-interface standards and features include: (See the RF technical description)
UMTS/WCDMA/GSM/GPRS/EDGE Specification Release '99 (3GPP R99)
GSM/GPRS/EDGE Specification Release 4 (3GPP R4)
UMTS/WCDMA Specification Release 5 (3GPP R5, QSC6270 only)
HSDPA and equalizer; 3.6 Mbps
Enhanced GPS position location using gpsOne (with RGR6240 IC, only QSC6270)
Integrated gpsOne functionality, featuring enhancements by SnapTrack®, Inc., to enable a
wide variety of location-based services and applications, including points of interest,
personal navigation, and friend finder
Simultaneous-GPS (processes GPS using dedicated circuitry while voice and/or data
signals continue to be processed separately)
1024x searcher, direct facility termination (DFT) accelerator, off-chip RAM for measured
data storage
3.6.6 Internal base band functions
Several baseband circuits within the QSC6240 device provide functions that are necessary only to
make the device operate properly — these functions are not generally used directly by other
handset circuits and functions.
PLLs and clock generation
Modes and resets
Security
Qfuse
JTAG/ETM
The clock block includes two PLLs, all phase-locked to the TCXO signal. These PLLs generate
several different stable, low-jitter clock signals that are distributed throughout the QSC device and
to external components as needed.
All the required WCDMA, GSM, GPS(only QSC6270), ARM, QDSP, and most peripheral clocks are derived in
some way from the TCXO (or XO) source for their operating modes, plus the 32.768 kHz
oscillator for their sleep modes
Copyright © 2009 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Figure 2.1.6 Clock block basic architecture of QSC6240
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3. Technical Brief
LGE Internal Use Only