Nacho,
Take a look at RTiC-Lab:
http://www.rtic-lab.org
for implementing your controller.
In terms of latencies, PCI can supposedly have sustained throughputs of:
((your bus frequency)/2 * 4 ) Megabytes/sec.
For example, a 66Mhz bus will have:
(66/2) * 4 = 132 MB/sec
In ISA you can have, at most, a BURST of 5MB/sec
In USB it should be higher than PCI, but I have no handle on that
number.
I hope that this helps.
What exactly is the sampling rate that you are trying to achieve for
your controller?
-Edgar
Nacho Horcas wrote:
> Dear all,
>
> I'm trying to do anything like this:
>
> I want to read a single analog datum from an external
> source, make a little process with it and send the
> result to another analog output. I think the best way
> to do this is with a real time operating system. I'm
> looking for a card with some DACs and ADCs to do this,
> but I can't find any able to read a datum and send it
> to the microprocessor with low latency. Do you have
> any suggestions?
>
> I have some problems finding information about PCI or
> USB latency. Does anyone know this values? Does anyone
> knows how to get the minimum latency with any
> software-hardware combination? (any hint will be very
> appreciated)
>
> Thanks in advance
>
> Ignacio Horcas
>
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