ch7009b Chrontel, ch7009b Datasheet - Page 26

• Manufacturer Part Number: ch7009b
• Description: Ch7009 Dvi / Tv Output Device
• Manufacturer: Chrontel

CHRONTEL
Flicker Filter Register
Bits 1-0 of register FF control the filter used in the scaling and flicker reduction block applied to the non-text portion of
the luminance signal as shown in Table 12 below.
Bits 3-2 of register FF control the filter used in the scaling and flicker reduction block applied to the text portion of the
luminance signal as shown in Table 12 below.
Bits 5-4 of register FF control the filter used in the scaling and flicker reduction block applied to the chrominance signal
as shown in Table 13 below. A setting of ‘11’ applies a dot crawl reduction filter which can reduce the ‘hanging dots’
effect of an NTSC composite video signal when displayed on a TV with a comb filter.
Bit 6 of register FF controls the video output format. A value of ‘0’ generates composite and S-Video outputs. A
value of ‘1’ generates RGB outputs.
Video Bandwidth Register
26
Table 11. Video Output Standard Selection
Table 12. Luma Flicker Filter Control
Table 13. Chroma Flicker Filter Control
VOS[1:0]
Output Format
Scaling Ratio
5/4
1/1, 7/8, 5/6, 3/4, 5/7, 7/10
5/8
5/9
1/2
Scaling Ratio
5/4
1/1, 7/8, 5/6, 3/4, 5/7, 7/10
5/8
5/9
1/2
DEFAULT
DEFAULT
SYMBOL
SYMBOL
TYPE
TYPE
BIT
BIT
VBID
R/W
7
1
7
00
PAL
2
YFFT and YFFNT Flicker Filter Settings (lines)
00
2
2
3
3
CFF Flicker Filter Settings (lines)
00
2
2
2
3
3
CFRB CVBWB
R/W
VOF
R/W
6
0
6
0
01
3
3
3
4
5
01
3
3
3
4
5
CFF1
R/W
R/W
10
3
4
4
5
5
5
0
01
NTSC
5
1
10
3
4
4
5
5
11
3
5
5
6
7
CBW
CFF0
R/W
R/W
4
1
4
0
3
5
6
6
7
11
YFFT1
YSV1
10
PAL-M
R/W
R/W
3
1
3
0
201-0000-035 Rev 3.31, 11/4/2004
YFFT0 YFFNT1
YSV0
R/W
R/W
Symbol:
Address:
Bits:
Symbol:
Address:
Bits:
2
1
2
1
11
NTSC-J
YCV1
R/W
R/W
CH7009B
1
1
1
1
7
VBW
8
FF
01h
02h
YFFNT0
YCV0
R/W
R/W
0
0
0
1