Difference between revisions of "Video Timing Register"
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(Created page with "{{NextRegister |Number=$11 |Readable=No |Writable=Yes |ShortDesc=Sets video output timing variant. }} {| class="wikitable" ! Bit !! Function |- | 7-3 || Reserved, must be 0...") |
(updated to 78a6ee50) |
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{{NextRegister | {{NextRegister | ||
|Number=$11 | |Number=$11 | ||
| − | |Readable= | + | |Readable=Yes |
|Writable=Yes | |Writable=Yes | ||
|ShortDesc=Sets video output timing variant. | |ShortDesc=Sets video output timing variant. | ||
}} | }} | ||
| + | (writable in config mode only) | ||
{| class="wikitable" | {| class="wikitable" | ||
! Bit !! Function | ! Bit !! Function | ||
| Line 17: | Line 18: | ||
! Bit pattern !! selected variant | ! Bit pattern !! selected variant | ||
|- | |- | ||
| − | | %000 || Base VGA timing ( | + | | %000 || Base VGA timing, clk28 = 28000000 (HDMI compatible) |
|- | |- | ||
| − | | %001 || VGA setting 1 | + | | %001 || VGA setting 1, clk28 = 28571429 (HDMI compatible) |
|- | |- | ||
| − | | %010 || VGA setting 2 | + | | %010 || VGA setting 2, clk28 = 29464286 |
|- | |- | ||
| − | | %011 || VGA setting 3 | + | | %011 || VGA setting 3, clk28 = 30000000 |
|- | |- | ||
| − | | %100 || VGA setting 4 | + | | %100 || VGA setting 4, clk28 = 31000000 |
|- | |- | ||
| − | | %101 || VGA setting 5 | + | | %101 || VGA setting 5, clk28 = 32000000 |
|- | |- | ||
| − | | %110 || VGA setting 6 | + | | %110 || VGA setting 6, clk28 = 33000000 |
| + | |} | ||
| + | |||
| + | Each VGA setting increases the frequency by approximately 1 kHz. | ||
| + | |||
| + | Experimental results based on "Vibrant VL5A9DL" vga monitor reports: | ||
| + | |||
| + | {| class="wikitable" | ||
| + | ! mode !! 50hz !! 60hz | ||
| + | |- | ||
| + | |vga0 || 49.3 || 58.1 | ||
| + | |- | ||
| + | |vga1 || 50.3 || 59.3 | ||
| + | |- | ||
| + | |vga2 || 51.9 || 61.1 | ||
| + | |- | ||
| + | |vga3 || 52.8 || 62.2 | ||
| + | |- | ||
| + | |vga4 || 54.6 || 64.3 | ||
| + | |- | ||
| + | |vga5 || 56.4 || 66.4 | ||
|- | |- | ||
| − | | | + | |vga6 || 58.1 || 68.5 |
|} | |} | ||
| − | + | 50/60Hz depending on bit 2 of {{NextRegNo|$05}}. | |
Latest revision as of 11:22, 3 November 2024
| Number | $11 |
|---|---|
| Readable | Yes |
| Writable | Yes |
| Short Description | Sets video output timing variant. |
(writable in config mode only)
| Bit | Function |
|---|---|
| 7-3 | Reserved, must be 0 |
| 2-0 | video signal timing variant |
Possible timing variants:
| Bit pattern | selected variant |
|---|---|
| %000 | Base VGA timing, clk28 = 28000000 (HDMI compatible) |
| %001 | VGA setting 1, clk28 = 28571429 (HDMI compatible) |
| %010 | VGA setting 2, clk28 = 29464286 |
| %011 | VGA setting 3, clk28 = 30000000 |
| %100 | VGA setting 4, clk28 = 31000000 |
| %101 | VGA setting 5, clk28 = 32000000 |
| %110 | VGA setting 6, clk28 = 33000000 |
Each VGA setting increases the frequency by approximately 1 kHz.
Experimental results based on "Vibrant VL5A9DL" vga monitor reports:
| mode | 50hz | 60hz |
|---|---|---|
| vga0 | 49.3 | 58.1 |
| vga1 | 50.3 | 59.3 |
| vga2 | 51.9 | 61.1 |
| vga3 | 52.8 | 62.2 |
| vga4 | 54.6 | 64.3 |
| vga5 | 56.4 | 66.4 |
| vga6 | 58.1 | 68.5 |
50/60Hz depending on bit 2 of Peripheral 1 Register ($05).