VGA, SRAM Controller

[Legato]

Hi everyone, I am new using FPGA´s, I am currently using an ED2 board From Terasic/Altera. I Have made two modules in VHDL, an VGA con

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troller to generate the sync signal and address, and a SRAM Controller. I have a image raw data in gray scale, sequentially stored in SRAM, When I try to display that image on a LCD monitor, the images moves from left to right, and from top to bottom, also appears black shades in the screen. If anyon have an a idea about my problem, I would be grateful.

Legato.

 

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Is the left to right occurring as a line by line shift or a complete shift of the display over all lines? In the first case you're probably not sending all the bits for the entire line out and are therefore sending the last bits out for the previous line out on the next line. This would cause both left-to-right top-to-bottom scrolling. So check to make sure your sync generation logic is correctly sending out the syncs at the right intervals.