Samsung S3C2451X User Manual page 618

CAMERA INTERFACE
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Non-Interleaved burst length
Y Main burst length = 4, 8, 16
C Main burst length = 2, 4, 8, 16
NOTE: When Interleave_Co = 1, there are some restricts in burst length setting as below.
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. 1 word = 4 pixel)
176 / 4 = 44 words , 44 % 8 = 4
If Interleave_Co = 1 and YCbCr = 4:2:2
176 x (1 word / 2 pixles) = 88 words , 88 % 16 = 8
Wanted main burst = 16 = 2 * Yburst1 = 4 * Cburst1, Wanted remained burst = 8 = 2 * Yburst2 = 4 * Cburst2
Yburst1_Co = 8, Yburst2_Co = 4
Example 2. Target image size : VGA (horizontal Y width = 640 pixels. 1 pixel = 1 Byte. 1 word = 4 pixel)
640 / 8 = 80 word , 160 % 8 = 0
If Interleave_Co = 1 , RGB565 mode
640 x (1 word / 2 pixel) = 320 words , 320 % 16 = 0
Yburst1_Co = 8, Yburst2_Co = 8
If Interleave_Co = 1 , RGB888 mode
640 x (1 word / 1 pixels) = 640 words, 640 % 16 = 0
Yburst1_Co = 8, Yburst2_Co = 8
REGISTER SETTING GUIDE FOR CODEC SCALER AND PREVIEW SCALER
SRC_Width and DST_Width satisfy the word boundary constraints such that the number of horizontal pixel can be
represented to kn where n = 1,2,3, ... and k = 1 / 2 / 8 for 24bppRGB / 16bppRGB / YCbCr420 image,
respectively. TargetHsize should not be larger than SourceHsize. Similarly, TargetVsize should not be larger than
SourceVsize.
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
23-26
Specifications and information herein are subject to change without notice.
Remained burst length = 4, 8, 16
Remained burst length = 2, 4, 8, 16
main burst = 8, remained burst = 4
Wanted main burst = 16, Wanted remained burst = 8
main burst = 8, remained burst = 8
Wanted main burst = 16, Wanted remained burst = 16
Wanted main burst = 16, Wanted remained burst = 16
S3C2451X RISC MICROPROCESSOR