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'inexpensive digital analyzer from INK'
1997\12\17@074745 by Jim Eller

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i'm interested in making/buying this analyzer.  It looks like
a good one at the right price.  what access time does the fifo have
to be to capture the data at 20mhz rate?  Is 50ns enough?  How can
I easily get a single fifo at the right price?  has anyone found
out which brand of fifo is best(AM7203,IDT7203 or LH540203) if
someone has a kit, i'd like to buy.  looks like the sclk and the
*reset should be buffered tho.   to capture 2k bytes at a 20mhz
rate then analyze thru the PC parallel port, sounds like something
i could use.

>To all,
>        I just picked up the December issue of Circuit Cellar,
>which contains a wonderful article from Francis Deck explaining
>his design for a very inexpensive LPT based-high speed logic
>analyzer. .........

1997\12\17@090427 by Keith Howell

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Is Circuit Cellar INK available to download?
We could do with the gadget described, but I have not seen INK
on UK magazine racks.

BTW, Elektor magazine had a contest for designs based on some new EPLD.
Among the winners was designs for LPT interfaced logic analysers.

I found Ciarcia's articles (when he did them for Byte magazine) were
thought-provoking although I often saw ways they could be made better
and/or cheaper. The Elektor design probably requires you to buy the PCB
and EPLDs from Elektor. Dearer than the unprogrammed part, but cheap if
you don't have to design/layout your own PCB and design the EPLD logic
and write the Windows interface program.

1997\12\17@193740 by Martin Darwin

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At 04:36 AM 12/17/97 -0800, you wrote:
>i'm interested in making/buying this analyzer.  It looks like
>a good one at the right price.  what access time does the fifo have
>to be to capture the data at 20mhz rate?  Is 50ns enough?  How can
>I easily get a single fifo at the right price?  has anyone found
>out which brand of fifo is best(AM7203,IDT7203 or LH540203) if

I looked around a bit for the FIFO. Didn't find much in terms of sources. I
almost had a heart attack when I saw the price of a 7205/50ns = $70 cdn @
Future Active (7203/50ns list at about $30cdn @ Future). They are usually a
bit over priced but that seems like highway robbery to me. This got me
thinking. Why not just use some cheaper 128K*8 SRAM's (28128/15ns = $50 @
Future) . Put two in parallel. Fill one. Read the other. And so on. More
circuitry but it may be much cheaper for high amounts of memory.

The problem with the original design in INK (IMHO) is that if the circuit
was used with an IBM XT the 8K FIFO would fill rapidly @ 20MHz. I think the
maximum I could sample on my old XT was ~11KHz. So you would probably only
end up with around 10K samples where as if 128K ram is used you get 128K
samples for around the same price (or cheaper).

I think I am going to build mine with a 128K*8 SRAM ram sending data to a
PIC/UART which will format and send the data serially to the computer @
115Kbaud. I will then be able to send the start sample and stop sample
commands to the PIC serially. I need it to be serial so that I can use
Linux and WinNT :).

>rate then analyze thru the PC parallel port, sounds like something
>i could use.

Well I could really use the HP LA or the TEK 4ch/4GigSample scope they have
at work but for some reason I can't afford them (I have no idea how
expensive they are, but i am sure  they are way beyond any hobbiest buget
:) ).

MD
--
Martin Darwin    a.k.a Rambo [CtF]  -- Play QUAKE!!
Firmware Design - spam_OUTmdarwinTakeThisOuTspamnewbridge.com
.....martinKILLspamspam@spam@davin.ottawa.on.ca                    Computer Engineering
http://www.davin.ottawa.on.ca/~martin  University of Ottawa

1997\12\18@101218 by Tom Handley

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  Jim, IDT is probably the most popular FIFO vendor though the others
mentioned in the article and Quality Semiconductor, have compatible
products. Typical access times are 12-15ns.

  - Tom

At 04:36 AM 12/17/97 -0800, you wrote:
{Quote hidden}

1997\12\18@101231 by Tom Handley

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  Keith, check out Circuit Cellar's web page at:

     http://www.circuitcellar.com

  They don't have the magazine on the web but they do have selected
articles, article software, as well as subscription information. It's
an excellent magazine.

  - Tom

At 01:58 PM 12/17/97 +0000, you wrote:
{Quote hidden}

1997\12\18@163916 by Dean

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For people who don't get INK you can get the zip
containing the schematic (PDF) and exe at:
ftp://http://www.circuitcellar.com/INK89/00_index.htm

with online issues at (some blocked off for non Wildcat(?) users):
ftp://http://www.circuitcellar.com/

and while your there look at:
ftp://http://www.circuitcellar.com/INK/00_index.htm

or from the author:
http://panda.bg.univ.gda.pl/~janusz/software.html


Dean.


(-;     If you're in a vehicle going the speed of light.....
       what happens when you turn on the headlights?
;-)

{Quote hidden}

1997\12\18@180608 by Jim Eller

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i'm interested in making/buying this analyzer.  It looks like
a good one at the right price.  what access time does the fifo
have to be to capture the data at 20mhz rate?  Is 50ns small
enough?  How can I easily get a single fifo at the right price?
has anyone found out which brand of fifo is best(AM7203,IDT7203
or LH540203) if someone has a kit, i'd like to buy.  looks like
the sclk and the *reset should be buffered tho.  to capture
2k bytes at a 20mhz rate then analyze thru the PC parallel
port, sounds like something i could use.

>To all,
>    I just picked up the December issue of Circuit Cellar,
>which contains a wonderful article from Francis Deck
>explaining his design for a very inexpensive LPT based-high
>speed logic analyzer............

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