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how to implement vga on spartan 3s400a

Posted on 2010-11-13
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Last Modified: 2012-05-10
I want to implement a vga port with (rgb, hsync, vsync) with my spartan 3s400a evaluation board. how should I do it in terms of hardware and software. This vga port should be connected to a simulated 8051 within the FPGA.
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Question by:Zhongcai
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Author Comment

by:Zhongcai
ID: 34130785
http://www.youtube.com/watch?v=tqBh5oEiWFM

it has been done already. i just need some help on how to implement this.
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Expert Comment

by:HappyCactus
ID: 34134816
Do you already have a fast dac?
If so, you just need a core, and opencores does have a vga/LCD controller[1] and a vga frame buffer[2].


[1] http://opencores.org/project,vga_lcd
[2] http://opencores.org/project,vgafb

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Author Comment

by:Zhongcai
ID: 34135417
hey cactus,

I don't need a DAC. i'm doing the R/2R method cause i only intend to use 3 bits for colours. can I have the code for vhdl instead of verilog. and how can i implement a video ram?
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HappyCactus earned 2000 total points
ID: 34136106
You must search opencores for a vhdl core. But maybe you can use it as well, if you development environment does provide a verilog compiler.
the video ram must be implemented with an external ram, because I doubt you have enough cells to build it inside your fpga.
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Author Comment

by:Zhongcai
ID: 34163215
thanks happyCactus. I learnt that the external ram is needed the hard way. tried to compile a full vga ram overnight. the compilation did not stop after 12hours of running on an i5 core.
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by:HappyCactus
ID: 34163238
Out of curiosity, how big was the ram? and how many gates did it take? ;-)
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Author Comment

by:Zhongcai
ID: 34187366
I tried several times.

1. 480x640 array of 3 =>failed
2. 240x320 array of 3 => failed

the synthesis didn't even complete. It just keep on runing
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Author Comment

by:Zhongcai
ID: 34187469
but i managed to implement within the spartan 3 a 8051 chip and a vga driver. made a pong game instead. and used 4 small arrays to control the 2 sticks and the ball inside the vga driver. problem solved in the end.
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