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

[John S. <joh...@go...>]

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...> 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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>