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14 Reference Infomation
14-5
Separate Sync
14-3 Timing Chart
C D
A
O
E
B
P
Video
Sync
Sync
Video
Q R S
A : Line time total B : Horizontal sync width O : Frame time total P : Vertical sync width
C : Back porch D : Active time Q : Back porch R : Active time
E : Front porch S : Front porch
H/V Composite Sync
Sync-on-Green
79.975
12.504
1.067
1.837
9.481
0.119
75.025
13.329
0.038
0.475
12.804
0.013
135.000
Positive
Positive
Separate
1280/75 Hz
1280x1024
1280/60 Hz
1280x1024
63.981
11.852
1.037
2.296
9.259
0.000
60.020
16.005
0.047
0.594
15.630
0.016
108.000
Positive
Positive
Separate
31.469
31.777
3.813
1.589
26.058
0.318
70.087
14.268
0.064
0.858
13.155
0.191
28.322
Negative
Positive
Separate
fH (kHz)
A μsec
B μsec
C μsec
D μsec
E μsec
fV (Hz)
O msec
P msec
Q msec
R msec
S msec
Clock
Freq.
(MHz)
Polarity
H.Sync
V.Sync
Remark
IBM
640/75 Hz
640x480
800/60 Hz
800x600
800/75 Hz
800x600
1024/60 Hz
1024x768
1024/75 Hz
1024x768
VGA2/
70 Hz
720 x 400
VGA3/
60 Hz
640 x 480
Table 14-1 Timing Chart
31.469
31.778
3.813
1.589
26.058
0.318
59.940
16.683
0.064
0.794
15.761
0.064
26.175
Negative
Negative
Separate
37.500
26.667
2.032
3.810
20.317
0.508
75.000
13.333
0.080
0.427
12.800
0.027
31.500
Negative
Negative
Separate
37.879
26.400
3.200
2.200
20.000
0.000
60.317
16.579
0.106
0.607
15.840
0.0261
40.000
Positive
Positive
Separate
46.875
21.333
1.616
3.232
16.162
0.323
75.000
13.333
0.064
0.448
12.800
0.021
49.500
Positive
Positive
Separate
48.363
20.677
2.092
2.462
15.754
0.369
60.004
16.666
0.124
0.600
15.880
0.062
75.000
Negative
Negative
Separate
60.023
16.660
1.219
2.235
13.003
0.203
75.029
13.328
0.050
0.466
12.795
0.017
78.750
Positive
Positive
Separate
Mode
VESA
Timing
- This section of the service manual describes the timing that the computer industry recognizes as standard for
computer-generated video signals.