Vocoder Subsystem; Memory Subsystem - LG -P990 Service Manual

3. TECHNICAL BRIEF

3.9.7 Vocoder Subsystem

FR, HR, EFR speech channels (TCH/FS, TCH/HS, TCH/EFS)
• NAMR/WAMR speech channels over GMSK and 8PSK
• Mandatory sub-functions for speech channels:
– Discontinous transmission (DTX)
– Voice activity detection (VAD)
– Background noise calculation
• Fullrate and halfrate data channels (F14.4, F9.6, F4.8, F2.4, H4.8, H2.4)

3.9.8 Memory Subsystem

The X-GOLD™616 can use the general term SDRAM as a shortcut for Mobile DDR SDRAM. A total of up to four
external memories is supported, chip selects can be dynamically allocated to one of the two external memory
controllers of X-GOLD™616. Only two memory devices can be connected to the SDRAM controller if DDR support
is required.
3.9.9 Battery Management – Hardware Configurations
The X-GOLD™616 chip has an internal PMU that will provide power supply for the chip itself, memory and the
attached RF. The X-GOLD also holds a measurement unit that can perform all necessary battery measurements
through external HW. This is sufficient for a modem only design where charging is controlled by another chip
3.9.10 Clocking
The clocking system is based on 2 different clocks, a 26 MHz reference clock generated within the RF Engine and
a 32 kHz real-time clock (RTC) generated in the baseband.The 26 MHz clock provided by the RF engine is the
main reference clock for the RF circuit and the X-GOLD™616. Also other system components may be supplied
with 26 MHz reference clocks. A 32 kHz oscillator located at the X-GOLD™616 supplies the RTC with the reference
clock for the real time clock application, as well as provides a low power standby clock for system sleep mode
operation. This clock is available
also for other system components like GPS.
.
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