S3C2440X Datasheet, PDF (370/429 Pages) Samsung semiconductor – 16/32-bit RISC microprocessor

CAMERA INTERFACE
2003.09.25
S3C2440X RISC MICROPROCESSOR
Y SCALE RATIO REGISTER
Register
YRATIO
Address
0x4F00004C
R/W
W
Description
A-port scaling ratio for luminace
Reset Value
0x14001400
YRATIO
YHRATIO
YVRATIO
Bit
[31:16]
[15:0]
Description
(Source Y size / Target Y size) x 4096
(Source Y size / Target Y size) x 4096
Initial State
0x1400
0x1400
Example 1. Source image Y size : VGA (640 x 480), Target image Y size for A-port : QCIF (176 x 144)
→ YHRATIO = (640 / 176) x 4096 = 14894.545 ⇒ 14894 (in round numbers) : 0x3a2e
→ YVRATIO = (480 / 144) x 4096 = 13653.333 ⇒ 13653 (in round numbers) : 0x3555
C SCALE RATIO REGISTER
Register
CRATIO
Address
0x4F000050
R/W
W
Description
A-port scaling ratio for chrominace
Reset Value
0x14002800
CRATIO
CHRATIO
CVRATIO
Bit
[31:16]
[15:0]
Description
(Source C size / Target C size) x 4096
(Source C size / Target C size) x 4096
Initial State
0x1400
0x2800
Example 1. Source image C size : VGA (320 x 480), Target image C size for A-port : QCIF (88 x 72)
→ CHRATIO = (320 / 88) x 4096 = 14894.545 ⇒ 14894 (in round numbers) : 0x3a2e
→ CVRATIO = (480 / 72) x 4096 = 27306.666 ⇒ 27306 (in round numbers) : 0x6aaa
23-18
Preliminary product information describes 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.