Samsung S3C6400X User Manual page 744

S3C6400X RISC MICROPROCESSOR
Marker
SOI
SOF
0
SOS
DQT
DHT
DRI
RSTm
EOI
The markers in Table 1 are subject to process during decompression. The other markers except SOF1~SOFF
and JPG will be ignored.
BITSTREAM OF COMPRESSED FILE
The created JPEG Bit Stream is shown below.
SOI
PROGRAMMER'S MODEL
Process start command instructs to start the encoding or decoding process of one frame, after setting various
registers. It is set by writing 0x1 on the SW_JSTART register. Then, the core processing will start and then
JPGSTS will be high. Operation can't be guaranteed when this command is issued again during processing. Do
not set like that.
Table 22-2. Registers that must be configured before start processing
Register
JPGMOD Process mode register
JPGQHNO Quantization and Huffman table number register
Table 22-1. Markers at JPEG CODEC
Codes(Hex)
FFD8
FFC0
FFDA
FFDB
FFC4
FFDD
FFD0~FFD7
FFD9
DQT DRI SOF0
Figure 22-3. Bit stream of JPEG file Block Diagram
Description
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.
Description
Start of image
Baseline DCT
Start of scan
Define quantization table
Define Huffman table
Define restart interval
Restart with module 8 count "m"
End of image
DHT SOS ECS
At Encoding process At Decoding process
Essential
Essential
JPEG CODEC
EOI
Essential
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22-5