VGA Signal Timing
2014-05-25 16:53
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官方的网址http://www.tinyvga.com/vga-timing
example：
VGA 640x350@70 Hz (pixel clock 25.175 MHz)
General timing
Horizontal timing (line) Polarity of horizontal sync pulse is positive.
Vertical timing (frame) Polarity of vertical sync pulse is negative.
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 |
| 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 |
| 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 |
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