[Open-graphics] video head 0 module template

[Simon Persson]

On Monday 02 October 2006 23:32, Timothy Miller wrote:

>
> // Since this is a DDR interface, it is convenient to use a DDR FF
> // to provide the clock signal.  IIRC, we want data0 to appear with
> // the rising edge of the clock, so we want to produce it on the
> // negative edge.
> ddrff1 ff0 (.Q(dvi_m_clk), .C0(clock), .C1(~clock), .D0(1'b0),
> .D1(1'b1), .OE(1'b1));
> ddrff1 ff1 (.Q(dvi_s_clk), .C0(clock), .C1(~clock), .D0(1'b0),
> .D1(1'b1), .OE(1'b1));
>

I'm not sure I understand the purpose of these... As I see it they only invert 
and add a slight delay. 


I've been working on generating the syncs and blank signal, I have something 
working but now I've been using clock_2x for the counting and just realised 
that all the horisontal timing numbers I've seen are even. So I could change 
it to use clock instead and cut the frequency needed in half. A good thing I 
guess?

Also... should I add a single link dvi mode before I post my solution?

And... final question... gtkwave won't start on my ubuntu edgy, it complains 
about "signalfont courier 14 missing". I saw a bugreport on this but no 
solution. Has anyone here run into that problem? I'm using ivi to view the 
vcd file now, are there any better alternatives?

Cheers,
Simon

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