CH7003B Datasheet, PDF (31/50 Pages) List of Unclassifed Manufacturers – Digital PC to TV Encoder

CHRONTEL
CH7003B
Register Descriptions
Display Mode Register
Symbol: DMR
Address: 00H
Bits: 8
Bit:
7
6
5
4
3
2
1
0
Symbol: ^IR2
IR1
IR0
VOS1
VOS0
SR2
SR1
SR0
Type:
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Default: ⁰
1
1
0
1
0
1
0
This register provides programmable control of the CH7003 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 Mode 17 640x480 input, NTSC output, 7/8’s scaling).
Table 17. Mode Selection
Mode IR[2:0] VOS
[1:0]
SR
[2:0]
0
000
00
000
1
000
00
001
2
000
01
000
3
000
01
001
4
001
00
000
5
001
00
001
6
001
01
000
7
001
01
001
8
010
00
000
9
010
00
001
10
010
01
000
11
010
01
001
12
010
01
010
13
011
00
000
14
011
00
001
15
011
00
011
16
011
01
001
17
011
01
010
18
011
01
011
19
100
00
001
20
100
00
011
21
100
00
100
22
100
01
011
23
100
01
100
24
100
01
101
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
Total Pixels/Line
x Total
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
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
Scaling
5/4
1/1
5/4
1/1
5/4
1/1
5/4
1/1
5/4
1/1
5/4
1/1
7/8
5/4
1/1
5/6
1/1
7/8
5/6
1/1
5/6
3/4
5/6
3/4
7/10
Pixel Clock
(MHz)
21.000000
26.250000
20.139860
24.671329
28.125000
34.875000
23.790210
29.454545
25.000000
31.500000
21.146853
26.433566
30.209790
21.000000
26.250000
31.500000
24.671329
28.195804
30.209790
29.500000
36.000000
39.000000
39.272727
43.636364
47.832168
VOS[1:0]
00
Output Format
PAL
01
NTSC
10
PAL-M
11
NTSC-J
201-0000-023 Rev 4.1, 8/2/99
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