CH7004C-V ETC1 [List of Unclassifed Manufacturers], CH7004C-V Datasheet - Page 42

• Manufacturer Part Number: CH7004C-V
• Description: Digital PC to TV Encoder with Macrovision
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

CHRONTEL
Register Descriptions (continued)
PLL N Value Register
The PLL N value register determines the division factor applied to the VCO output before being applied to the PLL phase
detector, when the CH7004 is operating in master or pseudo-master mode. In slave mode, the value of ‘N’ is always 1.
This register contains the lower 8 bits of the complete 10-bit N value. The pixel clock generated in a master and pseudo-
master modes is calculated according to the equation below:
When using a 14.318 MHz frequency reference, the required M and N values for each mode are shown in the table
below.
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.
42
Table 25. M and N Values for Each Mode
Mode
Bit:
Symbol:
Type:
Default:
Bit:
Symbol:
Type:
Default:
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
N7
R/W
1
7
Fpixel = Fref* [(N+2) / (M+2)]
6
N6
R/W
0
6
N 10-
bits
126
110
339
106
108
190
5
N5
R/W
0
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
N4
R/W
0
4
SHF1
R/W
0
Mode
15
16
17
18
19
20
21
22
23
24
25
26
27
28
3
N3
R/W
0
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
2
N2
0
2
SCO2
0
R/W
R/W
201-0000-024 Rev 2.1, 8/2/99
Symbol: PLLN
Address: 15H
Bits: 8
Symbol: BCO
Address: 17H
Bits: 6
1
N1
R/W
0
1
SCO1
R/W
0
N 10-
CH7004C
bits
110
126
190
647
284
302
242
86
94
62
31
31
9
2
0
N0
R/W
0
0
SCO0
R/W
0
M 9-
bits
313
103
197
63
63
89
33
33
19
89
33
33
3
2