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PRELIMINARY
CAMERA INTERFACE
S3C6400X RISC MICROPROCESSOR
20-26
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.
※
Non-Interleaved burst length (Y burst length – YcbCr 4:2:0, YCbCr 4:2:2)
Y
Main burst length = 4, 8, 16
Remained burst length = 4, 8, 16
C
Main burst length = 2, 4, 8, 16
Remained burst length = 2, 4, 8, 16
※
Non-Interleaved burst length (RGB burst length )
Y
Main burst length = 4, 8, 16
Remained burst length = 4, 8, 16
C No meaning
When YCbCr 4:2:2 interleave , burst size calculations are done to determine the wanted burst length. After finding
the wanted burst length.
The SFR fields are programmed as shown below,
Y : wanted Main burst length = 2 * Yburst1_Co, and wanted Remained burst length = 2 * Yburst2_Co.
Cb/Cr : wanted Main burst length = Yburst1_Co / 2 = Cburst1_Co, and wanted Remained burst length =
Yburst2_Co / 2 = Cburst2_Co
Example 1:
Target image size: QCIF (horizontal Y width = 176 pixels. 1 pixel = 1 Byte)
If output format non-interleave YCbCr 4:2:2, 0 (1 word = 4 pixels)
Yword = 176 / 4 = 44 words, 44 % 8 = 4
→
Y main burst = 8, Y remained burst = 4
Cword = 176 / 4 / 2 = 22 words, 22 % 4 = 2
→
C main burst = 4, C remained burst = 2
If output format YCbCr 4:2:2 interleave (1 word = 2 pixel)
176 x (1 word / 2 pixles) = 88 words, 88 % 16 = 8
→
Wanted main burst = 16, Wanted remained burst = 8
Wanted main burst = 16 = 2 * Yburst1 = 4 * Cburst1, Wanted remained burst = 8 = 2 * Yburst2 = 4 * Cburst2
Example 2:
Target image size: VGA (horizontal Y width = 640 pixels. 1 pixel = 1 Byte)
If output format non-interleave YCbCr 4:2:2,0 (1 word = 4 pixel)
Yword = 640 / 4 = 160 word, 160 % 8 = 0
→
Y main burst = 8, Y remained burst = 8
Cword = 640 / 4 / 2 = 80 word, 80 % 8 = 0
→
C main burst = 8, C remained burst = 8
If output format Interleave 4:2:2 or RGB565 mode (1 word = 2 pixel)