Samsung SyncMaster 570BTFT Service Manual page 6

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
VGA1/70 Hz
640 x 350
Timing
fH (kHz) 31.469
A µsec 31.778
B µsec 3.813
C µsec 1.589
D µsec 26.058
E µsec 0.318
fV (Hz) 70.086
O msec 14.268
P msec 0.064
Q msec 1.716
R msec 11.504
S msec 0.985
Clock
Frequency 25.175
(MHz)
Polarity
H.Sync Positive
V.Sync Negative
Remark Separate
Separate Sync
Horizontal
Video
Video
C D
C D E
Sync Sync Sync
B
B
A
A
A : Line time total
C : Back porch
E : Front porch
SyncMaster 570BTFT / 580BTFT
IBM
VGA2/70 Hz VGA3/60 Hz
720 x 400
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
Vertical
Video
Video
E Q R
Q R
Sync Sync
Sync
P P P
O O
O
B : Horizontal sync width
D : Active time
Table 2-1. Timing Chart
640/72 Hz
640 x 480 640 x 480
31.469 37.861
31.778 26.413
3.813 1.270
1.589 3.810
26.058 20.825
0.318 0.508
59.940 72.809
16.683 13.735
0.064 0.079
0.794 0.528
15.761 13.100
0.064 0.026
25.175 31.500
Negative Negative
Negative Negative
Separate Separate
S
S
O : Frame time total
Q : Back porch
S : Front porch
2 Product Specifications
VESA
640/75 Hz 800/56 Hz
640 x 480 800 x 600
37.500 35.156
26.667 28.444
2.032 2.000
3.810 3.556
20.317 22.222
0.508 0.667
75.000 56.250
13.333 17.778
0.080 0.057
0.427 0.626
12.800 17.067
0.027 0.028
31.500 36.000
Negative Positive
Negative Negative
Separate Separate
P : Vertical sync width
R : Active time
800/60 Hz
800 x 600
37.879
26.400
3.200
2.200
20.000
1.000
60.317
16.579
0.106
0.607
15.840
0.026
40.000
Positive
Positive
Separate
2-3