CH7004C Datasheet, PDF (32/51 Pages) List of Unclassifed Manufacturers – Digital PC to TV Encoder with Macrovision

CHRONTEL
CH7004C
Register Descriptions (continued)
Display Mode Register
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 CH7004 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).
Table 17. Display Modes
Mode
VOS
IR[20:] [1:0]
SR
[2:0]
Input Data
Format
(Active
Video)
Total
Pixels/Line
x Total
Lines/Frame
Output
Format
Scaling
Pixel Clock
(MHz)
0
000
00
000
512x384
840x500
PAL
5/4
21.000000
1
000
00
001
512x384
840x625
PAL
1/1
26.250000
2
000
01
000
512x384
800x420
NTSC
5/4
20.139860
3
000
01
001
512x384
784x525
NTSC
1/1
24.671329
4
001
00
000
720X400
1125X500
PAL
5/4
28.125000
5
001
00
001
720x400
1116x625
PAL
1/1
34.875000
6
001
01
000
720x400
945x420
NTSC
5/4
23.790210
7
001
01
001
720x400
936x525
NTSC
1/1
29.454545
8
010
00
010
640x400
1000x500
PAL
5/4
25.000000
9
010
00
001
640x400
1008x625
PAL
1/1
31.5000000
10
010
01
000
640x400
840x420
NTSC
5/4
21.146853
11
010
01
001
640x400
840x525
NTSC
1/1
26.433566
12
010
01
010
640x400
840x600
NTSC
7/8
30.209790
13
011
00
000
640x480
840x500
PAL
5/4
21.000000
14
011
00
001
640x480
840x625
PAL
1/1
26.250000
15
011
00
011
640x480
840x750
PAL
5/6
31.5000000
16
011
01
001
640x480
784x525
NTSC
1/1
24.671329
17
011
01
010
640x480
784x600
NTSC
7/8
28.195804
18
011
01
011
640x480
800x630
NTSC
5/6
30.209790
19
100
00
001
800x600
944x625
PAL
1/1
29.500000
20
100
00
011
800x600
960x750
PAL
5/6
36.0000000
21
100
00
100
800x600
936x836
PAL
3/4
39.000000
22
100
01
011
800x600
1040x630
NTSC
5/6
39.272727
23
100
01
100
800x600
1040x700
NTSC
3/4
43.636364
24
100
01
101
800x600
1064x750
NTSC
7/10
47.832168
25*
101
00
001
720x576
864x625
PAL
1/1
13.500000
26*
101
01
001
720x480
858x525
NTSC
1/1
13.500000
27*
110
00
001
800x500
1135x625
PAL
1/1
17.734375
28*
110
01
001
640X400
910X525
NTSC
1/1
14.318182
* Interlaced modes of operation. (For those modes, some functions will be bypassed. For details, please contact the
application department.)
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201-0000-024 Rev 2.1, 8/2/99