LG -P940 Service Manual page 40

3. TECHNICAL BRIEF
AE Subsystem
The AE is the core of the ABE subsystem. It performs the real-time audio processing within the ABE:
mixing, muxing, volume control, smooth muting, sampling rate conversion, and side-tone equalization. The AE
subsystem also processes and executes all data transfers. To optimize the global processing, the ATC moves the
data. An IRQ/DMA controller controls system IRQ and DMA requests. Input DMA requests come from the ABE
peripherals, and output DMA requests and IRQ are generated and sent to the system (Cortex-A9 MPU interrupt
controller, DSP interrupt controller, system DMA [sDMA], and the DSP enhanced direct memory access controller
[eDMA]).
The AE subsystem contains:
• AE: processes and executes the micro code with its own RAMs:
– SMEM
– CMEM
– PMEM
• DMEM contains the audio buffer and communication circular buffer.
• ATC: Transfers data between all modules in the ABE
• IRQ DMA controller
For more information about the audio engine, see the Audio Back-End (ABE) and Hardware Abstraction Layer
(HAL) Addendum.
Multichannel Audio Serial Port
The multichannel audio serial port (McASP) is a GP audio serial port. It is useful for intercomponent (DIT)
transmission. The McASP is intended to be flexible enough so that it may connect gluelessly to audio A/D, D/A,
CODEC and SPDIF transmit physical layer components.
McASP has the following features:
• 2-interconnect slave interface supports:
– One interconnect configuration slave interface
– One interconnect DMA slave interface
– 32-bit data bus width
– 16- and 32-bit access
– 10-bit address bus width
– Burst not supported
– WNP
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