ch7008a Chrontel, ch7008a Datasheet - Page 23

• Manufacturer Part Number: ch7008a
• Description: Digital Pc To Tv Encoder
• Manufacturer: Chrontel

CHRONTEL
Register Descriptions (continued)
Display Mode Register
201-0000-027 Rev 2.8, 6/24/2004
Table 13. Display Modes
This register provides programmable control of the CH7008 display mode, including input resolution (IR[2:0]),
output TV standard (VOS[1:0]), and scaling ratio (SR[2:0]). The mode of operation is determined according to the
table below (default is 640x480 input, NTSC output, 7/8’s scaling).
Bit:
Symbol:
Type:
Default:
Mode
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25*
26*
* Interlaced modes of operation. (For those modes, some functions will be bypassed. For details, please contact the
application department.)
IR[2:0]
000
000
000
000
001
001
001
001
010
010
010
010
010
011
011
011
011
011
011
100
100
100
100
100
100
101
101
7
IR2
R/W
0
VOS
[1:0]
00
00
01
01
00
00
01
01
00
00
01
01
01
00
00
00
01
01
01
00
00
00
01
01
01
00
01
6
IR1
R/W
1
SR
[2:0]
000
001
000
001
000
001
000
001
000
001
000
001
010
000
001
011
001
010
011
001
011
100
011
100
101
001
001
5
IR0
R/W
1
Input Data
Format
(Active
Video)
512x384
512x384
512x384
512x384
720X400
720x400
720x400
720x400
640x400
640x400
640x400
640x400
640x400
640x480
640x480
640x480
640x480
640x480
640x480
800x600
800x600
800x600
800x600
800x600
800x600
720x576
720x480
4
VOS1
R/W
0
Total
Pixels/Line
Lines/Frame
840x500
840x625
800x420
784x525
1125X500
1116x625
945x420
936x525
1000x500
1008x625
840x420
840x525
840x600
840x500
840x625
840x750
784x525
784x600
800x630
944x625
960x750
936x836
1040x630
1040x700
1064x750
864x625
858x525
x Total
3
VOS0
R/W
1
Output
Format
PAL
PAL
NTSC
NTSC
PAL
PAL
NTSC
NTSC
PAL
PAL
NTSC
NTSC
NTSC
PAL
PAL
PAL
NTSC
NTSC
NTSC
PAL
PAL
PAL
NTSC
NTSC
NTSC
PAL
NTSC
2
SR2
R/W
0
Scaling
5/4
1/1
1/1
5/4
1/1
5/4
1/1
5/4
1/1
7/8
1/1
7/8
5/6
1/1
5/4
1/1
5/4
5/4
1/1
5/6
1/1
5/6
3/4
5/6
3/4
7/10
1/1
1
SR1
R/W
1
Address: 00H
Bits: 8
CH7008A
Pixel Clock
(MHz)
21.000000
26.250000
20.139860
24.671329
28.125000
34.875000
23.790210
29.454545
25.000000
31.5000000
21.146853
26.433566
30.209790
21.000000
26.250000
31.5000000
24.671329
28.195804
30.209790
29.500000
36.0000000
39.000000
39.272727
43.636364
47.832168
13.500000
13.500000
0
SR0
R/W
0
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