Product Specifications
Page 7
VM78F
2-3 Timing Chart
This section describes the timings that the computer industry recognizes as standard for computer-generated
video signals.
Table 2-3. Timing Chart
Seperate Sync
Horizontal
Video
C
D
E
Sync
A
B
F
Vertical
Video
I
J
Sync
G
H
L
K
H.Parameters:
A: Period
B: Blanking Time
C: Sync Width
D: Back Porch
E: Active Time
F: Front Porch
V.Parameters:
G: Period
H: Blanking Time
I: Sync Width
J: Back Porch
K: Active Time
L: Front Porch
MODE
1
2
3
4
5
6
7
8
9
10
11
12
H. Dots
720
640
800
640
800
1024
800
1024
1280
1024
1280
1280
V. Lines
400
480
600
480
600
768
600
768
1024
768
1024
960
H. Freq.
(KHZ)
31.47
31.47
37.88
43.27
46.8
48.36
53.67
60.02
64.34
68.68
80
85.938
V. Freq.
(HZ)
70.08
59.95
60.32
85
75
60
85
75.03
60
85
75
85
A Period
(us)
31.78
31.78
26.4
23.11
21.333
20.68
18.63
16.66
15.55
14.56
12.504
11.636
B Blking
(us)
6.356
6.356
6.4
5.33
5.172
4.923
4.409
3.657
3.589
3.725
3.022
3.017
C Sync.
(us)
3.81
3.81
3.2
1.556
1.616
2.092
1.138
1.219
0.972
1.016
1.067
1.077
D B.P.
(us)
1.907
1.907
2.2
2.22
3.232
2.462
2.702
2.235
2.248
2.201
1.837
1.508
E Active
(us)
25.42
25.42
20
17.78
16.162
15.75
14.22
13
11.96
10.836
9.481
8.62
F F.P.
(us)
0.636
0.636
1
1.556
0.323
0.369
0.569
0.203
0.374
0.508
0.119
0.431
G Peroid
(ms)
14.27
16.68
16.58
11.76
13.333
16.67
11.76
13.33
16.67
11.77
13.329
11.764
H Blking
(ms)
1.557
1.43
0.739
0.67
0.533
0.786
0.578
0.533
0.642
0.582
0.525
0.593
I Sync.
(ms)
0.064
0.064
0.106
0.069
0.064
0.124
0.056
0.05
0.047
0.044
0.038
0.035
J B.P.
(ms)
1.08
1.02
0.607
0.578
0.448
0.6
0.503
0.466
0.501
0.524
0.475
0.547
K Active
(ms)
12.71
15.25
15.84
11.09
12.8
15.88
11.18
12.8
16.03
11.18
12.804
11.171
L F.P.
(ms)
0.413
0.35
0.026
0.023
0.021
0.062
0.019
0.017
0.094
0.015
0.013
0.012
CLOCK(MHZ)
28.3
25.1
40
36
49.5
65
56.25
78.75
107
94.5
135
148.5
Sync
H
-
-
+
-
+
+
+
+
+
+
+
+
Polarity
V
+
-
+
-
+
+
+
+
+
+
+
+
