Re: Advice on Logic Analyzer

On Mon, 14 Apr 2008 17:39:26 -0700 (PDT), "David L. Jones"
<altzone@xxxxxxxxx> wrote:

On Apr 15, 10:29 am, a7yvm109gf...@xxxxxxxxxxx wrote:
On Apr 14, 1:55 pm, n...@xxxxxxxxxxx (Nico Coesel) wrote:



I've used the logic port. It has way to little memory and it is not
very straightforward to use. If it where my money I would get the
janatek because it has 1mbit/channel memory.

I've experienced that too. It is a nice simple analyzer but if you
want to do something a bit weird like sample an entire screenful of
TTL RGBI (old video standard on 8 bit computers) data it cannot do
this. With 2048 bytes per channel it can barely store one or two lines
even with compression. It just doesn't work for this application. It
does work great for looking at an entire scanline with state data from
the rest of the computer. But I needed the whole screen full. Oh well,
it's a good thing I stopped that project... :)

Does the LogicPort use transitional sampling?

Yes.

It appears to with a spec that that includes "compression":
"Maximum sample compression: 2^33 to 1 (sample rates to 200MHz)"

If that is the case then the 2048 sample memory isn't as limiting as a
normal time sampling 2048 sample logic analyser. But I'd go for the
bigger memory unit myself.

It's not a universal tool, as evidenced by the "entire screenful"
example above, but I've been really happy with mine. I've also used
deep-memory realtime, non-transition analyzers and prefer the
LogicPort. A 1 Mbit/channel buffer at even a relatively slow 10 Msps
fills up in only 100 msec.

I am surprised, though, that Intronix hasn't come out with a follow-on
product with more sample memory. The LogicPort has been out for quite
a while (as these things go).

--
Rich Webb Norfolk, VA
.

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