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From: joonchai@d...<joonchai@d...>
Date: Wed Aug 25 06:08:50 CEST 2004
Subject: [openrisc] Simple VGA interface in ORPsoc Questions
I am using a MJL Stratix board to run OpenRisc 1000.
I have succeeded in running orpmon in UART mode,
but the "Simple VGA interface" doesn't seem to work.

I have some questions about the Simple VGA interface.
The questions are as follows.

Q1. Is it possible to run the vga interface in a fpga board?
Does it run in a Xess board with vga option on?
It seems the vga bandwidth requirement is too high for a fpga board.

Q2. hsync and vsync are generated from wb_clk.
What is the proper wb_clk frequency?

Q3. It seems the vga interface needs a frame buffer.
Is it necessary to use a separate frame buffer for the vga interface?
Is the frame buffer implemented in ORPsoc?
What is the size of the frame buffer for the vga interface?
Is it 640x480 bytes?

Thanks,

Joon