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'[OT]: DIP FPGAs: Are there any?'
2002\08\02@123213 by Brendan Moran

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I want a small FPGA to experiment with.  I don't want to have to deal
with SMT, since I just want to experiment with it for now, and in
general, SMT isn't great for that.  I know that there are SPLDs that
are DIP, but that's not quite what I'm looking for.

What I want is a FPGA with at least 24 internal registered bits, and
programmable I/O pins (I.E. input or ouput selectable using the
config).

I know a little about FPGAs, enough to know that they accept a config
stream on powerup, and once that is revieced, they begin to operate
much the same as a SPLD would, except that there are interconnects in
a FPGA, whereas there are none in an SPLD, which only has registers
on outputs, and all blocks output to a pin, not back into the chip.

One thing that I want to implement is a PS/2 host/slave on the same
IC, with an 8-line databus (with the standard control lines), 2
interrupt lines, and some miscellaneous I/O.

I don't think that this should be terribly difficult to implement on
a FPGA, but I don't know if I can find a small, cheap FPGA that would
do the job.  I think a 28-pin DIP that was an FPGA would probably
have enough I/O, in terms of physical pins.

Now, I know that I can implement a PS/2 controller or slave on a PIC.
I've done it.  I even posted the source, though I get the feeling
that no one liked it.

Anyway, does anyone know of an FPGA that would suit this?  I've
looked on Xilinx's website, and while I may have missed something, I
didn't find what I wanted.

- --Brendan

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2002\08\02@124612 by smerchock, Steve

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Brendan,

Check here:
http://www.hvwtech.com/intro-fpga.htm

This might be just what you're looking for.

Good luck!
Steve

Steven Kosmerchock
Radio Frequency Systems
Phoenix,  Arizona  USA
(WORK) http://www.rfsworld.com

http://www.geocities.com/researchtriangle/lab/6584

"Great spirits have always encountered violent
oppposition from mediocre minds."--A.Einstein



{Original Message removed}

2002\08\02@131406 by Brendan Moran

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Thanks, Steve

Now, that's interesting.  I'm still curious to see what others come
up with too, though.

Now, when it says 64 macrocells, each cell has a registered output,
right? That should work fine.  This sounds pretty nice.  I think I
may just order one of these, but I do want to know if anyone else
knows of anything like this.

- -- Brendan

> Check here:
> http://www.hvwtech.com/intro-fpga.htm
>
> This might be just what you're looking for.

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2002\08\02@214044 by Dwayne Reid

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At 10:11 AM 8/2/02 -0700, Brendan Moran wrote:

>Now, when it says 64 macrocells, each cell has a registered output,
>right? That should work fine.  This sounds pretty nice.  I think I
>may just order one of these, but I do want to know if anyone else
>knows of anything like this.

I use the Altera EPM7032 in several products, as well as the EPM7128.  The
'032 (and its big brother: epm7064) are easy to work with since they will
fit into a plcc-DIP adapter that I got somewhere.  The '7128 is in a 84 pin
plcc package - what I wound up doing was making a little board that holds a
plcc socket and brings out each pin to pins on a bunch of machine pin
sockets.  Nice, small, simple.  I also included a 10 pin jtag header on the
board.  This allowed easy connection of the PLD to my breadboard.

Although they are considered to be obsolete, you can also still get
Altera's EP910 in a 40 pin DIP package - 24 macrocells.  But the '7032 and
'7064 are cheaper.

dwayne

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Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
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