Samsung CF21G Series Service Manual page 5

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 1280/85 Hz
1024/85 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 94.500 157.500
Positive Positive Positive
Positive Positive Positive
Separate
Separate Separate
Sync-on-Green
Vertical
Green
Horizontal
P
B
O : Frame time total
Q : Back porch
S : Front porch
CONFIDENTIAL
1600/85 Hz
1920/75 Hz
1600 x 1200 1920 x 1440
91.146 106.250 112.5
9.412
10.971 8.900
0.837
1.016 0.754
1.325
1.422 1.185
8.127 6.972 6.465
0.406 0.279 0.485
85.024 85.000 75.00
11.765
11.761 13.300
0.028
0.033 0.027
0.433
0.483 0.498
11.235 11.294 12.800
0.011 0.009 0.009
229.500 297.000
Positive Negative
Positive Positive
Separate
Separate
Q R S
O
P : Vertical sync width
R : Active time
CF21G*