Samsung CF21M Service Manual page 74

2 Product Specifications
Mode
VGA2/70Hz
720 x 400
Timing
fH (kHz) 31.469
A µsec 31.778
B µsec 3.813
C µsec 1.907
D µsec 25.422
E µsec 0.636
fV (Hz) 70.087
O msec 14.268
P msec 0.064
Q msec 1.080
R msec 12.711
S msec 0.413
Clock
Freq. 28.322
(MHz)
Polarity
H.Sync Negative
V.Sync Positive
Remark Separate
Separate Sync
Horizontal
Video
C D E
Sync Sync
B
A
A : Line time total
C : Back porch
E : Front porch
2-2
Table 2-1. Timing Chart
IBM
VGA3/60Hz 640/85 Hz
640 x 480 640 x 480
31.469 43.269
31.778 23.111
3.813 1.556
1.907 3.810
25.422 5.222
0.636 17.778
59.940 85.008
16.683 13.333
0.064 0.080
1.048 0.427
15.253 12.800
0.318 0.027
25.175 36.000
Negative Negative
Negative Negative
Separate Separate
Vertical
Video
Q R S
Sync Sync
P P
O O
B : Horizontal sync width
D : Active time
VESA
800/85 Hz
1024/85 Hz 1280/75 Hz
800 x 600
1024 x 768 1280 x 1024
53.674
68.677
18.631 14.561
1.138
1.016
2.702 2.201
14.222
10.836
0.569 0.508
85.061
84.997
11.756
11.765
0.056
0.044
0.503
0.524
11.179
11.183
0.019
0.015
56.250 94.500
Positive
Positive
Positive
Positive
Separate
Separate Separate
Vertical
Green
Horizontal
P
B
O : Frame time total
Q : Back porch
S : Front porch
1280/85 Hz 1600/85 Hz
1280 x 1024 1600 x 1200
106.250
79.976 91.146
12.504 10.971
1.067 0.016
1.837 1.422
9.481 8.127
0.119 0.406
75.025 85.024
13.329 11.761
0.038 0.033
0.475 0.483
12.804 11.235
0.013 0.011
135.000 157.500 229.500
Positive
Positive Positive
Positive
Positive Positive
Separate
Separate
Sync-on-Green
R
Q S
O
P : Vertical sync width
R : Active time
9.412
0.837
1.325
6.972
0.279
85.000
11.765
0.028
0.433
11.294
0.009
CF21M*