Timing Chart - Samsung 740NW 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 computer-
generated video signals.
IBM
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
P : Vertical sync width
: Back porch
R : Active timeE : Front porch
14-4
Table 14-1 Timing Chart
VGA3/
640/75 Hz 800/60 Hz
60 Hz
640x480 800x600
640 x 480
31.469 37.500 37.879
31.778 26.667 26.400
3.813 2.032 3.200
1.589 3.810 2.200
26.058 20.317 20.000
0.318 0.508 0.000
59.940 75.000 60.317
16.683 13.333 16.579
0.064 0.080 0.106
0.794 0.427 0.607
15.761 12.800 15.840
0.064 0.027 0.0261
26.175 31.500 40.000
Negative Negative Positive
Negative Negative Positive
Separate Separate Separate
Video
Q R S
Sync
P
O
B : Horizontal sync width
C : Back porch
VESA
800/75 Hz 1024/60 Hz 1024/75 Hz
800x600 1024x768 1024x768
46.875 48.363 60.023
21.333 20.677 16.660
1.616 2.092 1.219
3.232 2.462 2.235
16.162 15.754 13.003
0.323 0.369 0.203
75.000 60.004 75.029
13.333 16.666 13.328
0.064 0.124 0.050
0.448 0.600 0.466
12.800 15.880 12.795
0.021 0.062 0.017
49.500 75.000 78.750
Positive Negative Positive
Positive Negative Positive
Separate Separate Separate
H/V Composite Sync
Sync-on-Green
S : Front porch
1280/60 Hz 1280/75 Hz
1280x1024 1280x1024
63.981 79.975
11.852 12.504
1.037 1.067
2.296 1.837
9.259 9.481
0.000 0.119
60.020 75.025
16.005 13.329
0.047 0.038
0.594 0.475
15.630 12.804
0.016 0.013
108.000 135.000
Positive Positive
Positive Positive
Separate Separate
O : Frame time total
D : Active time Q