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