Re: [Fx2lib-devel] Generating a clock with the GPIF

[Eric W. <er...@wi...>]

Yes I think that the GPIF could generate a high frequency clock.  You 
could even use the RDY0/1 pins to make is programmable, say 4 different 
frequencies.  This would however be limited to less than the FX2 CPU 
clock.  The single frequency clock and adjusting the blanking time seems 
like the better solution to me.

Eric Winsor

John Smithee wrote:
> To support different frame rates, I thought I would need a variable 
> clock. But probably adding blanking times to the lines will give me 
> enough flexibility to the frame rate so I can go with a single 
> oscillator.
>
> But I am curious: Wouldn't it be possible to create a waveform that 
> generates a high frequency clock?
>
>
> On Sun, Mar 22, 2009 at 6:20 PM, Eric Winsor <er...@wi... 
> <mailto:er...@wi...>> wrote:
>
>     There is no good way to make a programmable high frequency clock
>     on the
>     FX2.  You can make a low frequency clock using an internal timer
>     driving
>     a GPIO pin.  You will be limited to a resolution of 4 or 12 FX2 CPU
>     clock cycle periods.  Any thing high frequency will have the CPU
>     always
>     servicing the timer interrupt.  I would not do this for any thing
>     beyond
>     audio frequencies.  Why not just use a small clock oscillator.
>      The size
>     would likely be a fraction of the imager size.
>
>     Eric Winsor
>
>
>
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