Subsystem Of Stn8810 - LG KT610 Service Manual

3.9 Subsystem of STn8810

3.9.1 ARM926EJ processor
The STn8810 CPU is an ARM926EJ reduced instruction set computer (RISC) processor.
This 32-bit processor core supports 32-bit ARM® and 16-bit Thumb instruction sets, enabling the user
to trade off between high performance and high code density.
The cached ARM CPU features a memory management unit (MMU) and is clocked at 264 MHz.
It has a 32-Kbyte instruction cache and a 16-Kbyte data cache, and supports the Jazelle¢‚ extensions
for Java acceleration. It also includes an embedded trace module (ETM Medium+) for real-time CPU
activity tracing and debugging. It supports 4-bit and 8-bit normal trace mode and 4-bit demultiplexed
trace mode, with normal or half-rate clock.
3.9.2 Smart video accelerator (SVA)
Using leading-edge technology, this block is a low-power, high-performance video accelerator that
supports the following features:
■ MPEG-4 simple profile level 3 video encoder and decoder; real time up to VGA 30 fps encode only
or decode only)
■ H.263 profile 3 level 10 video codec; real time subQCIF or QCIF 15 fps for videoconferencing
■ H.263 profile 3 level 30 video encoder or decoder; real-time up to CIF 30 fps
■ JPEG baseline accelerated encoder or decoder, up to 4080 x 4080 pixels
■ Programmable DSP (MMDSP+) for intermediate level processing, clocked at 66 MHz
■ Picture pre-/post-processing
■ Low-power implementation
3.9.3 Smart audio accelerator (SAA)
This high-performance block is a flexible sophisticated audio accelerator based on the MMDSP+
programmable audio DSP, clocked at 133 MHz, and features:
■ 24-bit data path
■ Ultra-low power implementation
The audio accelerator features:
■ MP3, AAC, AAC+ (SBR) decoding, Midi synthesis, and more
■ Speech codecs: AMR (WB, NB), and more
■ Audio sample rates of 32 kHz, 44.1 kHz and 48 kHz
■ Noise reduction and echo cancelling
■ Stereo enhancements and surround effects
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3. TECHNICAL BRIEF
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