S5D2650 Samsung Semiconductor, Inc., S5D2650 Datasheet - Page 37

• Manufacturer Part Number: S5D2650
• Description: Multistandard Video Decoder/scaler
• Manufacturer: Samsung Semiconductor, Inc.

S5D2650 Data Sheet
similar fashion as decoded video. For 8-bit output format, data is output at CK rate using the same 8-bit port as the
decoded video. For 16-bit and 24-bit output format, data is output at CK2 rate using Y and C ports. The sequence
of data output is CVBS
raw CVBS data).
For Closed Caption data, two read-only registers, CCDAT1 and CCDAT2, are provided so the Closed Caption data
can be read via the host interface. The VBIFLG bit can be polled to see if data captured in the two registers can be
safely read.
1.8. COLOR SPACE CONVERTER
The color space converter processes the video data as YCbCr 4:4:4 when converting to RGB. A programmable
limiter (YCRANG) can be imposed on the Y/C data to limit the ranges. One can choose to limit the Y/C to 1 - 254,
or Y to 16 - 235 and C to 16 - 240.
When selected, YCbCr 4:4:4 is converted to 24 bit RGB according to the following equations:
For 16-bit RGB output, truncation with dithering is used to convert the data from 24 bit to 16 bit.
1.9. GAMMA CORRECTION
The S5D2650 programmable gamma tables allows the customer to apply many different type of corrections. These
corrections can be a standard 2.2 factor for NTSC or 2.8 for PAL. These factors can be applied in the RGB or YUV
domains.
A basic standard gamma equation of
when applied to the R, G, or B signals, generates the response shown as the upper curve below. It is the inverse of
the monitor response and thus compensates to produce a linear response.
ELECTRONICS
2n
on Y, and CVBS
G = C
2n+1
Y
- 0.703(C
R = C
B = C
on C (note that EXV port is not used in 24-bit format for outputting
Y
Y
J
+ 1.375(C
+ 1.734(C
R
=
-128) - 0.328(C
J
'
6 2 6
B
R
-128)
-128)
B
-128)
MULTIMEDIA VIDEO
PAGE 37 OF 95
7/18/03