Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Problem with VGA controller

Hello! I include in my project lcd vga controller from the auto_graphics_ref_design-v1.0.4 . I see on the screen simple graphics( lines, boxes, circules), but image is very unstable: it jumpin...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

--- Quote Start ---

originally posted by tembridis@Mar 26 2007, 06:13 AM

why didnt you simple change the timing values in vga_timing.v? but then again, i too wrote my own controller as the reference design has too many limitations. static palettes and hardcoded timing values render this design useless for me. nick, is the fmax decrease so bad that it affects the pixelclock? if so, can you elaborate abit more on how you added the second layer?

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=22507)

--- quote end ---

--- Quote End ---

Hello tembridis! I changed vga_timing.v but Image was unstable too. I don&#39;t know why. Moreover Fmax was 50Mhz and this refdesign takes large resources. Thats why I got vga_timing.v and add dual-clock FIFO and avalon interface. Fmax with second layer was 60Mhz. Now I use only one lyaer with Fmax 90Mhz. I draw all by software.