ch7012a Chrontel, ch7012a Datasheet - Page 23

• Manufacturer Part Number: ch7012a
• Description: Ch7012 Tv Output Device
• Manufacturer: Chrontel

CHRONTEL
Display Mode Register
Register DM provides programmable control of the CH7012 VGA to TV display mode, including input resolution
(IR[2:0]), video output standard (VOS[1:0]), and scaling ratio (SR[2:0]). The mode of operation is determined according
to Table 9 below. For entries in which the output standard is shown as PAL, PAL-B,D,G,H,I,N,N
through proper selection of the chroma sub-carrier. For entries in which the output standard is shown as NTSC, NTSC-
M,J and PAL-M can be supported through proper selection of VOS[1:0] and chroma sub-carrier.
201-0000-042 Rev 2.1, 10/20/2004
Table 9. Display Mode
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
27
28
29
30
31
32
33
34
35
36
37
38
DEFAULT:
SYMBOL:
TYPE:
BIT:
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
101
101
101
110
110
110
110
110
110
111
111
111
111
111
111
101
100
VOS
[1:0]
R/W
00
00
01
01
00
00
01
01
00
00
01
01
01
00
00
00
01
01
01
01
01
01
00
00
00
00
00
00
01
01
01
00
00
00
01
01
01
00
01
IR2
7
0
SR[2:0]
000
001
000
001
000
001
000
001
000
001
000
001
010
000
001
011
001
010
011
001
010
011
001
011
100
001
011
100
110
101
100
101
110
101
110
000
000
111
111
R/W
IR1
(Active Video)
1024x768
1024x768
1024x768
1024x768
1024x768
1024x768
Input Data
6
1
512x384
512x384
512x384
512x384
720x400
720x400
720x400
720x400
640x400
640x400
640x400
640x400
640x400
640x480
640x480
640x480
640x480
640x480
640x480
720x480
720x480
720x480
720x576
720x576
720x576
800x600
800x600
800x600
800x600
800x600
800x600
720x576
720x480
Format
R/W
IR0
Total Pixels/Line
5
1
Lines/Frame
1125x500
1152x625
1000x500
1008x625
1040x700
1064x750
1040x840
1400x875
1400x1000
1400x1125
1160x840
1160x945
1168x1050
840x500
840x625
800x420
784x525
945x420
936x525
840x420
832x525
840x600
840x500
840x625
840x750
784x525
784x600
800x630
882x525
882x600
900x630
882x625
900x750
900x875
944x625
960x750
960x875
864x625
858x525
x Total
VOS1
R/W
4
0
[TV Standard]
Output Stan-
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
NTSC
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
PAL
dard
VOS0
R/W
3
1
Scaling
7/10
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
7/8
5/6
1/1
5/6
5/7
1/1
5/6
5/7
3/4
5/8
5/7
5/8
5/9
5/8
5/9
1/2
1/1
1/1
R/W
SR2
Symbol:
Address:
Bits:
2
0
Overscan
Percent
-17
-33
-20
-13
-30
-16
-13
-30
-17
-27
-17
-30
-13
-18
-13
-18
-18
-30
-14
-27
-14
-22
-16
-25
-10
-20
+4
+4
+4
+4
-6
-4
0
0
0
0
0
0
0
R/W
SR1
C
CH7012A
can be supported
1
1
21.000000
26.250000
20.139860
24.671329
28.125000
36.000000
23.790210
29.454545
25.000000
31.500000
21.146854
26.181819
30.209791
21.000000
26.250000
31.500000
24.671329
28.195805
30.209790
27.755245
31.720280
33.986015
27.562500
33.750000
39.375000
29.500000
36.000000
42.000000
43.636364
47.832169
52.363637
61.250000
70.000000
78.750000
58.405595
65.706295
73.510491
13.500000
13.500000
Pixel Clock
DM
00h
8
(MHz)
R/W
SR0
23
0
0