Daniel Rozsnyó wrote:
Hello,
does anybody know what is the correct phase between hsync and vsync
signal, or that does not matter because the two axes are running
independently ? (at least in CRT)
---
Btw, big thanks to Timothy & others for the Verilog course and the
opengraphics wiki - I've made this simple circuit using the information
from the wiki in 2 hours - http://diary.rozsnyo.com/2006/08/07/syncgen/
(never coded verilog before;)
Now I want to make it 2D (H/V) and generate a test patter on LCD. The
final "product" will be a simple display tester - accepting any
progressive modeline. Maybe I put there one more register to specify the
H to V phase.
The official IBM spec for VGA sync is negative (TTL levels) for
648x480. However, the IBM spec specifies different polarities of sync
for the 350 (H+, V-) and 400 (H-, V+) line modes.
Sync on Green is negative (with positive video).
This, IIUC, is because it is based on TV transmission which uses
negative video and positive sync.
Composite sync is NOT(H XOR V) for negative sync.
--
JRT
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