5-21
No.
1 2
Item
Abbreviation
VGA 640x480 60Hz
MAC 640x480
Pixel frequency
fc
25.175MHz
30.24MHz
Horizontal frequency
fh
31.47kHz
35.00kHz
Line Time total
Th
31.78us
800CLK
28.57us
864CLK
Horizontal active display
Thd
25.42us
640CLK
21.16us
640CLK
Horizontal sync pulse
Thp
3.81us
96CLK
2.12us
64CLK
Horizontal
back
porch Thb 1.91us 48CLK 3.17us 96CLK
Horizontal
front
porch Thf 0.64us 16CLK 2.12us 64CLK
Horizontal sync polarity
NEG
NEG
Vertical Frequency
fv
59.992Hz
66.66Hz
Frame time total
Tv
16.68ms
525H
15.00ms
525H
Vertical active display
Tvd
15.25ms
480H
13.71ms
480H
Vertical sync pulse
Tvp
0.06ms
2H
0.09ms
3H
Vertical back porch
Tvb
1.02ms
33H
1.11ms
39H
Vertical front porch
Tvf
0.35ms
10H
0.09ms
3H
Vertical sync polarity
NEG
NEG
No.
3 4
Item
Abbreviation
VGA 640x480 72Hz
VESA 640x480 75Hz
Pixel frequency
fc
31.500MHz
31.500MHz
Horizontal frequency
fh
37.86kHz
37.50kHz
Line Time total
Th
26.41us
832CLK
26.67us
840CLK
Horizontal active display
Thd
20.32us
640CLK
20.32us
640CLK
Horizontal sync pulse
Thp
1.27us
40CLK
2.03us
64CLK
Horizontal
back
porch Thb 4.06us 128CLK 3.81us 120CLK
Horizontal
front
porch Thf 0.76us 24CLK 0.51us 16CLK
Horizontal sync polarity
NEG
NEG
Vertical Frequency
fv
72.81Hz
75.00Hz
Frame time total
Tv
13.73ms
520H
13.33ms
500H
Vertical active display
Tvd
12.68ms
480H
12.80ms
480H
Vertical sync pulse
Tvp
0.08ms
3H
0.08ms
3H
Vertical back porch
Tvb
0.74ms
28H
0.43ms
16H
Vertical front porch
Tvf
0.24ms
9H
0.03ms
1H
Vertical sync polarity
NEG
NEG
No.
5 6
Item
Abbreviation
VGA 720x350 70Hz
VGA 720x400 70Hz
Pixel frequency
fc
28.322MHz
28.322MHz
Horizontal frequency
fh
31.47kHz
31.47kHz
Line Time total
Th
31.78us
900CLK
31.78us
900CLK
Horizontal active display
Thd
25.42us
720CLK
25.42us
720CLK
Horizontal sync pulse
Thp
3.81us
108CLK
3.81us
108CLK
Horizontal
back
porch Thb 1.91us 54CLK 1.91us 54CLK
Horizontal
front
porch Thf 0.64us 18CLK 0.63us 18CLK
Horizontal sync polarity
POS
NEG
Vertical
Frequency fv
70.087Hz 70.087Hz
Frame time total
Tv
14.27ms
449H
14.27ms
449H
Vertical active display
Tvd
11.12ms
350H
12.71ms
400H
Vertical sync pulse
Tvp
0.06ms
2H
0.06ms
2H
Vertical back porch
Tvb
1.91ms
60H
1.11ms
35H
Vertical front porch
Tvf
1.18ms
37H
0.38ms
12H
Vertical sync polarity
NEG
POS