4-12
6.5 Reference Signal Timing
Item Abbreviation VESA 1280x1024 75Hz VESA 640x480 75Hz
Pixel frequency fc 135.00MHz 31.500MHz
Horizontal frequency fh 79.98kHz 37.50kHz
Line Time total Th 12.50us 1688CLK 26.67us 840CLK
Horizontal active display Thd 9.48us 1280CLK 20.32us 640CLK
Horizontal sync pulse Thp 1.07us 144CLK 2.03us 64CLK
Horizontal back porch Thb 1.84us 248CLK 3.81us 120CLK
Horizontal front porch Thf 0.12us 16CLK 0.51us 16CLK
Horizontal sync polarity POS NEG
Vertical Frequency fv 75.03Hz 75.00Hz
Frame time total Tv 13.33ms 1066H 13.33ms 500H
Vertical active display Tvd 12.80ms 1024H 12.80ms 480H
Vertical sync pulse Tvp 0.04ms 3H 0.08ms 3H
Vertical back porch Tvb 0.48us 38H 0.43ms 16H
Vertical front porch Tvf 0.01ms 1H 0.03ms 1H
Vertical sync polarity POS NEG
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