LSI Logic Confidential
4-2
Functional Description
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
DSP and Motion Estimation coprocessor that off-load compute-intensive
tasks from the SPARC processors.
4.2.1
Motion Estimation Coprocessor
The programmable motion estimation (ME) coprocessor has a
throughput of 29 billion arithmetic operations per second (BOPS). It takes
the motion estimation commands from the SPARC processor and
generates results for each target. A single interrupt is generated at the
end of each ME stage.
4.2.2
Video DSP Coprocessor
The video DSP coprocessor performs vector memory-to-memory
instructions. This improves code density and off-loads the SPARC
processors. Its 64 Kbyte data memory is double-buffered (two banks) to
allow concurrent DMA and DSP operations. Some of the functions that
the DSP coprocessor performs include:
•
Detelecine
•
Activity measures
•
Motion compensation
•
Adaptive temporal and de-interlace filtering
•
Linear filtering/decimation
•
DCT/IDCT (discrete cosine/inverse discrete cosine transforms, up to
12 bits)
•
Quantization / Dequantization
•
Variable length encoding / decoding
The video DSP coprocessor operates at approximately 16 BOPS.
4.3
Audio Processing
As shown in
, the audio processing hardware is physically
integrated into each SPARC processor. The hardware consists of two
parallel 63-bit MAC units with 32-bit precision, and a DSP instruction set
to support efficient encoding and decoding of a wide variety of audio
algorithms. These include MPEG-1 Layer 2, DTS, MP3, AC-3, AAC, etc.,
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