VGA Signal Timing
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官方的网址http://www.tinyvga.com/vga-timing
example:
640 x 350
VGA 640x350@70 Hz (pixel clock 25.175 MHz)
General timing
Screen refresh rate
70 Hz
Vertical refresh
31.46875 kHz
Pixel freq.
25.175 MHz
Horizontal timing (line) Polarity of horizontal sync pulse is positive.
Scanline part
Pixels
Time [µs]
Visible area
640
25.422045680238
Front porch
16
0.63555114200596
Sync pulse
96
3.8133068520357
Back porch
48
1.9066534260179
Whole line
800
31.777557100298
Vertical timing (frame) Polarity of vertical sync pulse is negative.
Frame part
Lines
Time [ms]
Visible area
350
11.122144985104
Front porch
37
1.175769612711
Sync pulse
2
0.063555114200596
Back porch
60
1.9066534260179
Whole frame
449
14.268123138034
0 0
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