Vocoder Subsystem; Memory Subsystem - LG -P970 Service Manual

Audio Processing on Audio Front End
The AFE is used as a playback and capture device, i.e. exchanging digital audio stereo samples on both
directions (from microphone to DSP and from ARM/DSP to speaker). On audio-in path analog to digital
conversion and amplification is executed. On the audio-out path digital to analog conversion and power
amplification is performed. Additionally, the AFE physically selects the correct audio analog paths and is directly
managing the analog inputs and outputs.

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 General-Purpose Input/Output Interface
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
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3. TECHNICAL BRIEF
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