Re: PCI interface


"Nico Coesel" <nico@xxxxxxxxxxx> wrote in message
news:461d4556.83558040@xxxxxxxxxxxxxxxxx
"Jon Slaughter" <Jon_Slaughter@xxxxxxxxxxx> wrote:


<jrwalliker@xxxxxxxxx> wrote in message
news:1176291190.028355.58260@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Memory is cheap, so why not buffer a capture sweep to some ram which
is local to the adc and then use whatever method is easiest to get the
data into the PC?


Thats was one idea I had but I wonder why most pc scopes do not do this?
Most just have a few KB and at most a few MB. I imagine that it is
probably
more difficult to design a high speed memory controller. I just figure
that
since the pc already has all this stuff one should take advantage of it.

It just seems like its probably much more complicated? (and its
complicated
enough I suppose.)

A PC can't handle the bandwidth for a prolonged period. Besides,
you'll need some processing to display the signal. Processing -say- 1
GB of data takes a while even if you have a fast processor.



I'm not going to display the data in real time. Atleast that doesn't have to
be an option. In any cause the display of the signal is at a far smaller
resolution than the signal itself so you can ignore a lot of the data. The
high bandwidth is for non-realtime analysis such as zooming in on the signal
or data analysis. It doesn't do you much good to view a signal thats going
by at 1Ghz because your eyes can't follow it unless its periodic. But if
you have a history you can scroll through even if its not periodic.
Ofcourse you'll still end up ignoring most of the samples or need some
inteligent software to make it easier to traverse the history.



.

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