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Text File  |  1995-11-19  |  1.5 KB  |  39 lines
  1. Monitor Timings
  2.  
  3. A monitor needs synchronisation information in order to display the image
  4. correctly. Each line contains one sync impulse for the horizontal timing,
  5. each image one sync  impulse  for  the  vertical  timing.  The  following
  6. picture shows all timing parameters:
  7.  
  8.  
  9.   1  Pixels (Horizontal) or Lines (vertical)
  10.   |----------/.../------------------------------------------------------->|
  11.  
  12.   VGA Parameters     Diplay End     Sync Start     Sync End  Blank End  Total
  13.                      Blank Start        |              |         |        |
  14.                          |              |              |         |        |
  15.   Scan line/Image        V              V              V         V        V
  16.   -----------\   \--------              ----------------                  ----\
  17.   | X Data  X/.../X X X X|              |              |                  | X /
  18.   -----------\   \-----------------------              -------------------|---\
  19.  
  20.   |<---------/.../------>|<------------>|<------------>|                  |
  21.          Resolution      | Pulse Offset   Pulse Length                    |
  22.                          |                                                |
  23.   CVMode Settings        |<---------------------------------------------->|
  24.                                            Sync Length
  25.  
  26. Each horizontal step must be a multiple of 8.
  27.  
  28. Some Formulas:
  29.  
  30.  Horizontal
  31.  
  32.   Blank End = Total - 16
  33.   Frequency = Pixel Clock / Total
  34.  
  35.  Vertical
  36.  
  37.   Blank End = Total - 1
  38.   Frequency = Horizontal Frequency / Total
  39.