trossin wrote:
> If you really want to go on the cheap (<$20) try my PIC based logic analy=
zer. =

> I use it for I2C and SPI.
> =

> http://www.geocities.com/ted_rossin/Electronics/Pic/Pic.html#LogicAnalyzer
> http://www.geocities.com/ted_rossin/Electronics/Pic/Pic.html#LogicAnalyze=
r =


I've been doing something similar using a Xilinx XC9500XL CPLD (why? they'r=
e =

=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 U=
SB =

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 d=
o =

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 too =
(if =

I get sufficiently bored).
   - Another with a Nokia cellphone display, powered by an SX28AC. Simple P=
C =

link support, a Ramtron FRAM for data storage, and the aforementioned analo=
gue =

front end.

I'd love to turn them both into saleable products, but CE (EMC directive on=
ly =

- IIRC the Low Voltage Directive only covers 50 to 400V) approvals testing =
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 ViewFind=
er
philpem@dsl.pipex.com         | Cheetah: Athlon64 3200+ A8VDeluxeV2 512M+10=
0G
http://www.philpem.me.uk/     | Tiger: Toshiba SatPro4600 Celeron700 256M+4=
0G
-- =

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