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S3C6400X RISC MICROPROCESSOR
process is performed over the DCT coefficients by utilizing the quantization tables. During decoding,
dequantization will be done and then DCT coefficients will be transformed into the image data.
HUFFMAN CODER AND MARKER PROCESS
Variable-length encoding and decoding are done based on Huffman table.
QUANTIZATION TABLE
It is the place to store quantization table. This is the RAM area, where users can allocate.
HUFFMAN TABLE
It is the place to store Huffman tables, This is the RAM area where users can allocate
REGISTER ACCESS
The registers can be
modified:
1.
After reset, until a new job
Or
2.
After process completion interruption signal is generated, until a new job starts.
Other conditions indicate that the core is in the normal operation, therefore no modification is allowed. For some
registers, either write or read may be prohibited.
TABLE ACCESS
Four Huffman tables (AC & DC, 2 tables each) and four quantizer tables must be configured before
compression. To set any Quantizer table and Huffman table, the corresponding entry register must be accessed
first. Then burst write transfers must follow. For better understanding of the burst write transfer, refer to Figure.
22-2. The access order for each table is shown below.
starts.
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
JPEG CODEC
22-3
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