Nokia 920C Service Manual page 5

2 Product Specifications
Mode
IBM
VGA2/70Hz 640/85Hz
720 x 400 640 x 480
Timing
fH (kHz) 31.469 43.269
A µsec 31.778 23.111
B µsec 3.813
C µsec 1.907
D µsec 25.422 17.778
E µsec 0.636
fV (Hz) 70.087 85.008
O msec 14.268 11.764
P msec 0.064
Q msec 1.080
R msec 12.711 11.093
S msec 0.413
Clock
Freq. 28.322 36.000
(MHz)
Polarity
H.Sync Negative Negative
V.Sync Positive Negative
Remark Separate Separate
Separate Sync
Horizontal
Video
C D
Sync Sync
B
A
A : Line time total
C : Back porch
E : Front porch
2-2
1024/75 Hz 800/85 Hz
1024 x 768 800 x 600
60.023 53.674
16.660 18.631
1.556 1.219 1.138
2.222 2.235 2.702
13.003 14.222
0.203
1.556 0.569
75.025 85.061
13.328 11.756
0.069 0.050 0.056
0.578 0.466 0.503
12.795 11.179
0.023 0.017
0.019
78.75 56.250
Positive Positive
Positive Positive
Separate
Separate
Vertical
Video
E
Q R
Sync Sync
P P
O O
B : Horizontal sync width
D : Active time
Table 2-1. Timing Chart
VESA
1024/85 Hz
1280/75 Hz
1024 x 768
1280 x 1024
68.677 79.976
14.561
12.504
1.016
1.067
2.201
1.837
10.836 9.481
0.508 0.119
84.997
75.025
11.765
13.329
0.044
0.038
0.524 0.475
11.183 12.804
0.015
0.013
94.500
135.000
Positive
Positive
Positive Positive
Separate
Separate
Green
Horizontal
B
S
O : Frame time total
Q : Back porch
S : Front porch
1600/75 Hz
1280/85 Hz
1600 x 1200
1280 x 1024
91.146 93.750
10.971 10.667
1.016 0.948
1.422 1.501
8.127
7.901
0.406 0.316
85.024 75.000
11.761 13.333
0.033 0.032
0.483
0.491
11.235 12.800
0.011 0.011
157.500 202.500
Positive Positive
Positive Positive
Separate Separate
Sync-on-Green
Vertical
P
Q
O
P : Vertical sync width
R : Active time
MAC.
832/75 Hz 1152/75 Hz
832 x 624 1152 x 870
49.726 68.681
20.110 14.560
4.117 1.280
3.910 1.440
14.524 11.520
0.559 0.320
75.000 75.062
13.414 13.322
0.060 0.044
0.784 0.568
12.549 12.667
0.020 0.044
100.000
57.284
Negative Negative
Negative Negative
SOG SOG
R
S
720C/920C