VGA
Notes
3 signal, 1 for each color (red, green, blue), colors signals are 75Ω analog signals with a value beetween 0v and 0.7v.
2 sync signals: - H sync, for horizontal sync - V sync, for vertical sync Each of them respect a pattern like : display (0), front porch (0), sync pulse (1), back porch (0).
H sync should be generate during V sync. When not pixel is display (during front porch, sync pulse and back porch, for H sync or V sync), color signal should be set to low (black)
My wire
| Number | Color | Usage |
|---|---|---|
| 1 | Red | Red video |
| 2 | Green | Green video |
| 3 | Blue | Blue video |
| 5 | Black | Return HSYNC |
| 6 | Black | Return Red |
| 7 | Black | Return Green |
| 8 | Black | Return Blue |
| 10 | Black | Return VSYNC |
| 13 | Yellow | HSYNC |
| 14 | White | VSYNC |
VHDL VGA driver
Code can be found here VGA.vhdl
By default drive 800*600 but should be ok with every resolution/pixel clock (but not tested)