Samsung S5PC110 Manual page 1749

S5PC110_UM
12.6.3 STARTING PROCESS
Process start signal from the scheduler instructs to start compression or decompression process of one picture
after setting various registers. After getting the start signal, the core processing starts and then JPGOPR register
is read as 1. Operation cannot be guaranteed if the start signal is issued again during processing.
Table 12-1 Registers that Must be Configured Before Compression
Registers
JPGMOD
QTBL
JPGDRI_U
JPGDRI_L
JPGY_U
JPGY_L
JPGX_U
JPGX_L
QTBL0
QTBL1
QTBL2
QTBL3
OUTFORM
ENC_STREAM_INTSE
HDTBL0, HDCTBLG0
HACTBL0, HACTBLG0
HDCTBL1, HDCTBLG1
HACTBL1, HACTBLG1
Contents of registers in
1. After user writes the registers again.
2. After reset operation is done.
3. After decompression of arbitrary JPEG file. In this case, the registers have the value from header of input
JPEG file after header parsing process.
Except in the above cases, it is possible to process next picture by only performing the process start signal after
process of a picture is completed.
Process Mode Register
Quantization Table Number Register
Reset Interval Registers (upper 8bit)
Reset Interval Registers (lower 8bit)
Vertical Size Register (upper 8bit)
Vertical Size Register (lower 8bit)
Horizontal Size Register (upper 8bit)
Horizontal Size Register (lower 8bit)
Quantizer Table0 Entries Register.
Quantizer Table1 Entry Register
Quantizer Table2 Entry Register
Quantizer Table3 Entry Register
Output Color Format of Decompression
Compressed Stream Size Interrupt Setting
Register
DC Huffman Table0 Entry Register
AC Huffman Table0 Entry Register
DC Huffman Table1 Entry Register
AC Huffman Table1 Entry Register
will be changed in following cases.
Table 12-1
Description
12 11BJPEG
At comp At Decomp
Essential Essential
Essential
Essential
Essential
Essential
Essential
Essential
Essential
Essential
Essential
Essential
Essential
-- Essential
Essential
Essential
Essential
Essential
Essential
--
--
--
--
--
--
--
--
--
--
--
12-7