Timing Chart - Samsung LE20S81BX Service Manual

14 Reference Infomation

14-3 Timing Chart

This section of the service manual describes the timing that the computer industry recognizes as standard for com-
puter-generated video signals.
Mode
VGA2/
70 Hz
Timing 720 x 400
fH (KHz) 31.469
A μsec 31.777
B μsec 3.813
C μsec 1.589
D μsec 26.058
E μsec 0.318
fV (Hz) 70.087
O msec 14.268
P msec 0.064
Q msec 0.858
R msec 13.155
S msec 0.191
Clock
Freq. 28.322
(MHz)
Polarity
H.Sync Negative
V.Sync Positive
Remark Separate
Separate Sync
Video
C D E
Sync
B
A
A : Line time total
C : Back porch
E : Front porch
14-4
Table 2-1 Timing Chart
IBM
VGA3/ 640/75 Hz,
60 Hz 60Hz, 72Hz
640 x 480 640 x 480
31.469 37.500
31.778 26.667
3.813 2.032
1.589 3.810
26.058 20.317
0.318 0.508
59.940 75.000
16.683 13.333
0.064 0.080
0.794 0.427
15.761 12.800
0.064 0.027
25.175 31.500
Negative Negative
Negative Negative
Separate Separate
Video
Q R S
Sync
P
O
B : Horizontal sync width
D : Active time
VESA
800/75 Hz, 56Hz,
1024/60Hz
60Hz, 72Hz
1024 x 768
800 x 600
46.875 48.363
21.333 20.677
1.616 2.092
3.232 2.462
16.162 15.754
0.323 0.369
75.000 60.004
13.333 16.666
0.064 0.124
0.448 0.600
12.800 15.880
0.021 0.062
49.500 75.000
Positive Negative
Positive Negative
Separate Separate
H/V Composite Sync
A
Horizontal Vertical
P
B
Sync-on-Green
Vertical
Green
orizontal
P
B
O : Frame time total
Q : Back porch
S : Front porch
1024/75Hz
1280/75Hz, 50Hz
1280x1024
1024 x 768
60.023 79.976
16.660 12.504
1.219 1.067
2.235 1.837
13.003 9.481
0.203 0.119
75.029 75.025
13.328 13.329
0.050 0.038
0.466 0.475
12.795 12.804
0.017 0.013
78.750 135.000
Positive Positive
Positive Positive
Separate Separate
VIDEO
Q S
R
O
Q R S
O
P : Vertical sync width
R : Active time