Timing Chart - Samsung AQ17KS Service Manual

2-3 Timing Chart

This section of the service manual describes the timing that the computer industry recognizes as standard
for computer-generated video signals.
Mode
IBM
VGA2/70 Hz
720 x 400
Timing
fH (kHz) 31.469
A µsec 31.778
B µsec 3.813
C µsec 1.907
D µsec 25.422
0.636
E µsec
fV (Hz) 59.940
16.683
O msec
P msec 0.064
1.048
Q msec
R msec 15.253
0.318
S msec
Clock
Frequency 25.175
(MHz)
Polarity
Negative
H.Sync
V.Sync Negative
Separate
Remark
Separate Sync
Horizontal
Video
Video
C D E
C D E
Sync Sync
Sync
B
B
A
A
A : Line time total
C : Back porch
E : Front porch
AQ17KS
Table 2-1. Timing Chart
VGA3/60 Hz
640/75 Hz
640 x 480
640 x 480
31.469
37.500
31.777 26.667
3.813 2.032
1.907 3.810
25.422 20.317
0.636 0.508
70.087 75.000
14.268 13.333
0.064 0.080
1.080 0.427
12.711 12.800
0.413
0.027
28.322 31.500
Negative Negative
Positive Negative
Separate
Separate
Vertical
Video
Video
Q R S
Q R S
Sync Sync
Sync
P P P
O O
O
B : Horizontal sync width
D : Active time
VESA
640/85 Hz 800/75 Hz
800 x 600
640 x 480
43.269
46.875
23.111
21.333
1.556
1.616
2.222
3.232
17.778
16.162
1.556
0.323
85.008
75.000
11.764
13.333
0.671
0.064
0.578
0.448
11.093
12.800
0.023
0.021
36.000
49.500
Negative
Positive
Negative
Positive
Separate
Separate
O : Frame time total
Q : Back porch
S : Front porch
2 Product Specifications
800/85 Hz 1024/75 Hz
800 x 600 1024 x 768
53.674 60.023
18.631 16.660
1.138 1.219
2.702 2.235
14.222 13.003
0.569 0.203
85.061 75.029
11.756 13.328
0.056 0.050
0.503 0.466
11.179 12.795
0.019 0.017
56.250 78.750
Positive Positive
Positive Positive
Separate Separate
P : Vertical sync width
R : Active time
1024/85 Hz
1024 x 768
68.677
14.561
1.016
2.201
10.836
0.508
84.997
11.765
0.044
0.524
11.183
0.015
94.500
Positive
Positive
Separate
2-3