ch7019 Chrontel, ch7019 Datasheet - Page 42

• Manufacturer Part Number: ch7019
• Description: Ch7019 Tv Encoder / Lvds Transmitter
• Manufacturer: Chrontel

CHRONTEL
Black Level Register
Register BL controls the black level. The luminance data is added to this black level, which must be set between 65 and
170. When the input data format is 0 through 3 or 5 the default values are 131 for NTSC and PAL-M with DACG[1:0]
(register 21h) = ‘00’ and 109 for PAL with DACG[1:0]= ’01’ and 102 for NTSC-J with DACG[1:0] = ‘01’. When the
input data format is 4, 6 or 7 the default values are 113 for NTSC and PAL-M with DACG[1:0] = ‘10’, 94 for PAL with
DACG[1:0] = ‘11’ and 88 for NTSC-J with DACG[1:0] = ‘11’. See also the description for the BLKEN bit
1Dh, bit 6).
Contrast Enhancement Register
CE[2:0] (bits 2-0) of register CE control the contrast enhancement feature of the CH7019, according to Figure 20 below.
A setting of ‘0’ results in reduced contrast, a setting of ‘1’ leaves the image contrast unchanged, and values beyond ‘1’
result in increased contrast. [Note: The straight line denotes Yout = Yin and therefore no enhancement.]
42
DEFAULT:
DEFAULT:
SYMBOL:
SYMBOL:
256
Yout
TYPE:
TYPE:
< >
BIT:
BIT:
i
n
512
444
376
308
240
172
104
36
Reserved Reserved Reserved Reserved Reserved
32
32
R/W
R/W
BL7
7
1
7
0
36
R/W
R/W
BL6
6
0
6
0
104
Figure 20: Contrast Enhancement of the CH7019
R/W
R/W
BL5
5
0
5
0
172
R/W
R/W
BL4
Yin
240
4
0
4
0
n
308
R/W
R/W
BL3
3
0
3
0
376
Symbol:
Address:
Bits:
Symbol:
Address:
Bits:
201-0000-048
R/W
R/W
BL2
CE2
2
0
2
0
444
R/W
R/W
BL1
CE1
BL
07h
8
CE
08h
3
Rev. 2.4, 12/18/2006
1
1
1
1
512
CH7019B
(register
R/W
R/W
BL0
CE0
0
1
0
1