LG Electronics LG-C320 service manual Air interfaces, Internal base band functions, Jtag/Etm

3. TECHNICAL BRIEF

3.1.5 Air interfaces

The supported air-interface standards and features include: (See the RF technical description)

GSM/GPRS/EDGE Specification Release 4 (3GPP R4)

Enhanced GPS position location using gpsOne (with RGR6240 IC)

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

3.1.6 Internal base band functions

Several baseband circuits within the QSC6270(3G disable)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 c omponents 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

Figure 3.1.6 Clock block basic architecture of QSC6270(3G disable)

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