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2-3 Timing Chart
This section describes the timings that the computer industry recognizes as standard for computer-generated
video signals.
Mode
H. Dots
V. Dots
H-freq (kHz)
Sync Polarity
A period us
B Blanking us
C Sync us
D B.P. us
E Active us
F F.P. us
V-freq (Hz)
Sync Polarity
O Period ms
P Blanking ms
Q Sync ms
R B.P. us
S Active us
T F.P. us
Horizontal
H.Parameters:
A: Period
C: Sync Width
E: Active Time
Table 2-2. Timing Chart
1
2
640
640
480
480
31.47
37.5
-
-
31.78
26.666
6.356
6.35
3.81
2.03
1.907
3.81
25.42
20.32
0.636
0.51
59.95
75
-
-
16.68
13.33
1.43
0.533
0.064
0.08
1.02
0.427
15.25
12.8
0.35
0.026
E
B
Video
D
F
Sync
C
A
B: Blanking Time
D: Back Porch
F: Front Porch
3
4
5
640
800
800
480
600
600
43.3
46.8
53.67
-
+
+
23.111
21.333
18.63
5.33
5.172
4.409
1.556
1.616
1.138
2.222
3.232
2.702
17.778
16.162
14.22
1.556
0.323
0.569
85
75
85
+
-
+
11.764
13.333
11.76
0.67
0.533
0.578
0.069
0.064
0.056
0.578
0.448
0.503
11.093
12.8
11.18
0.023
0.021
0.019
Seperate Sync
Vertical
J
I
V.Parameters:
G: Period
I: Sync Width
K: Active Time
6
7
8
1024
1280
1024
768
1024
768
60.02
63.98
68.68
+
+
+
16.66
15.63
14.56
3.657
3.778
3.725
1.219
1.037
1.016
2.235
2.296
2.201
13
11.852
10.836
0.203
0.444
0.508
75.03
60
85
+
+
+
13.33
16.661
11.77
0.533
0.656
0.582
0.05
0.047
0.044
0.466
0.594
0.524
12.8
16.005
11.18
0.017
0.016
0.015
K
H
Video
L
Sync
G
H: Blanking Time
J: Back Porch
L: Front Porch
VM77S
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