Re: [Discuss-gnuradio] The coming deluge of CPU cycles

[Daniel O'Connor]

On Friday 28 July 2006 01:33, Eric Blossom wrote:
> > A 9030 is target only, you'd need a 9054, 9056, 9060 or 9080 otherwise
> > the performance would not be very great.
>
> Good point.  I've written drivers using the 9080 before it was pretty
> easy to use.  The scatter/gather stuff worked fine for me, at least
> from the point of view of the host side.

Yeah, I mean to say that you COULD use it, but it would need more host 
intervention and/or a reasonable amount of on card buffering.

You can't (as far as I can see) say to the SG engine that it's reading from a 
FIFO and it should treat the data as precious. Also there is no input to the 
PLX chip to allow you to gate reads (ie a data available pin).

So if you wanted to use it you'd have to set up some local memory and then 
copy data into that (from the FPGA) and then signal the host when a "page" is 
done so it can program the PLX chip. Means you get an interrupt every page 
which seems inefficient to me.

-- 
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
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