ch7009a ETC-unknow, ch7009a Datasheet - Page 25

• Manufacturer Part Number: ch7009a
• Description: Chrontel Ch7009 Dvi / Tv Output Device
• Manufacturer: ETC-unknow

CHRONTEL
Table 11: Video Output Standard Selection
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.
Table 12: Luma Flicker Filter Control
Table 13: Chroma Flicker Filter Control
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.
201-0000-035 Rev 1.1, 5/8/2000
DEFAULT:
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
SYMBOL:
TYPE:
BIT:
7
00
PAL
YFFT and YFFNT Flicker Filter Settings (lines)
00
2
2
2
3
3
CFF Flicker Filter Settings (lines)
00
2
2
2
3
3
VOF
R/W
6
0
01
3
3
3
4
5
01
3
3
3
4
5
CFF1
R/W
10
3
4
4
5
5
01
NTSC
5
1
10
3
4
4
5
5
11
3
5
5
6
7
CFF0
R/W
4
0
11
3
5
6
6
7
YFFT1
10
PAL-M
R/W
3
0
YFFT0 YFFNT1
R/W
Symbol:
Address:
Bits:
2
1
11
NTSC-J
R/W
CH7009A
1
1
FF
01h
8
YFFNT0
R/W
25
0
1