ch7004c Chrontel, ch7004c Datasheet - Page 40

• Manufacturer Part Number: ch7004c
• Description: Digital Pc To Tv Encoder With Macrovisiontm
• Manufacturer: Chrontel

CHRONTEL
Buffered Clock Output Register
The buffered clock output register determines which clock is selected to be output at the buffered clcok output pin,
and what frequency value should be output if a VCO derived signal is output. The tables below show the possible
outputs signals.
40
Table 25. M and N Values for Each Mode
Table 26.Clock Output Selection
Mode
Bit:
Symbol:
Type:
Default:
SCO[2:0]
000
001
010
011
100
101
110
111
10
11
12
13
14
0
1
2
3
4
5
6
7
8
9
512x384, PAL, 5:4
512x384, PAL, 1:1
512X384, NTSC, 5:4
512X384, NTSC, 1:1
720X400, PAL, 5:4
720X400, PAL, 1:1
720X400, NTSC, 5:4
720X400, NTSC, 1:1
640X400, PAL, 5:4
640X400, PAL, 1:1
640X400, NTSC, 5:4
640x400, NTSC, 1:1
640X400, NTSC, 7:8
640X480, PAL, 5:4
640X480, PAL, 1:1
Standard, Scaling Ratio
VGA Resolution, TV
7
Buffered Clock Output
(for test use only)
VCO divided by K3 (see Table 27)
Field ID signal
Sine ROM MSB (for test use only)
Cosine ROM MSB (for test use only)
TV horizontal sync (for test use only)
TV vertical sync (for test use only)
14MHz crystal
6
N 10-
bits
126
339
106
108
190
110
5
SHF2
R/W
0
20
53
70
94
22
20
9
9
9
M 9-
bits
138
13
89
63
26
63
33
61
63
11
89
13
4
3
4
4
SHF1
R/W
0
Mode
15
16
17
18
19
20
21
22
23
24
25
26
27
28
3
SHF0
R/W
0
640X480, PAL, 5:6
640X480, NTSC, 1:1
640X480, NTSC, 7:8
640X480, NTSC, 5:6
800X600, PAL, 1:1
800X600, PAL, 5:6
800X600, PAL, 3:4
800X600, NTSC, 5:6
800X600, NTSC, 3:4
800X600, NTSC, 7:10
720X576, PAL, 1:1
720X480, NTSC, 1:1
800X500, PAL, 1:1
640X400, NTSC, 1:1
Standard, Scaling Ratio
VGA Resolution, TV
201-0000-024 Rev. 2.4, 6/24/2004
2
SCO2
0
R/W
Address: 17H
Bits: 6
Symbol: BCO
1
SCO1
R/W
0
N 10-
CH7004C
bits
126
190
647
284
302
242
110
86
94
62
31
31
9
2
0
SCO0
R/W
0
M 9-
bits
313
103
197
63
63
89
33
33
19
89
33
33
3
2