Hi Philip,

For moving bits around, you're totally right: can't beat a decent CPLD
and the 9500 series is great.

To be honest with you, and this is my own opinion, forget the 'scope
options. I sense that a  lot of people like hardware scopes (just like
DMMs) and the same people favour computer-based logic analyzers! (Go
figure).

Regulatory approval is a b*tch everywhere. Can you circumvent CE by
selling a kit or "hobbyist" version?

-marc

On 8/14/06, Philip Pemberton <philpem@dsl.pipex.com> wrote:
> trossin wrote:
> > If you really want to go on the cheap (<$20) try my PIC based logic ana=
lyzer.
> > I use it for I2C and SPI.
> >
> > http://www.geocities.com/ted_rossin/Electronics/Pic/Pic.html#LogicAnaly=
zer
> > http://www.geocities.com/ted_rossin/Electronics/Pic/Pic.html#LogicAnaly=
zer
>
> I've been doing something similar using a Xilinx XC9500XL CPLD (why? they=
're
> =A31.20 in 1-off, and not too power hungry). All the triggering logic is
> basically done - I'm just working on the host interface (CPLD interfaces =
to a
> PIC's PSP, then the PIC does protocol conversion to interface to a PC via=
 USB
> or RS232) and the acquisition logic now.
>
> I've even got a (paper-only ATM) design for a combination of the logic
> analysis engine and a simple 60MSPS oscilloscope. The eventual plan is to=
 do
> two designs:
>    - One with no display at all, powered by a PIC18F4550. Full firmware
> upgrade support, and maybe some support for gate array fusemap updates to=
o (if
> I get sufficiently bored).
>    - Another with a Nokia cellphone display, powered by an SX28AC. Simple=
 PC
> link support, a Ramtron FRAM for data storage, and the aforementioned ana=
logue
> front end.
>
> I'd love to turn them both into saleable products, but CE (EMC directive =
only
> - IIRC the Low Voltage Directive only covers 50 to 400V) approvals testin=
g is
> pretty damned expensive, and that's the real show-stopper.. RoHS I can
> probably handle, but EMC/LVD is going to be a real pig :(
>
> --
> Phil.                         | Kitsune: Acorn RiscPC SA202 64M+6G ViewFi=
nder
> philpem@dsl.pipex.com         | Cheetah: Athlon64 3200+ A8VDeluxeV2 512M+=
100G
> http://www.philpem.me.uk/     | Tiger: Toshiba SatPro4600 Celeron700 256M=
+40G
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>

-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist