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Altera_Forum
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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...
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Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Hello Nick,

a few months ago i got this reference design as well. I got it up and running easily on a EP2C35. My assumption would be that your electrical connection is the source of your problem. Ensure that pixel clock, vsync and hsync are properly shield versus ground or otherwise you will have a distorted image display. I used the proto pins on the EP2C35 board to connect it with a small TFT display using prefab'ed 25cm wires. Without shielding the aforementioned signals i got a distorted display as well. Entangling pixel clock wire with a ground wire did the trick (likewise with vsync and hsync).