Date   : Sun, 28 Aug 2005 12:44:59 +0100
From   : Phil Blundell <philb@...>
Subject: Re: 80186 co-pro

On Fri, 2005-08-12 at 07:35 +0100, Sprow wrote:
> A small FPGA with distributed RAM is the way, then a can make the FIFO a few
> kB long!

It turns out that suitable FPGAs are not quite as common as one might
hope.  Most of the newer ones (Spartan-3 and the like) lack 5V
tolerance, which would be a pain.  My first idea was to use a
Spartan/XL, but on further investigation it seems to be difficult to get
synthesis tools for those. 

So, the best compromise seems to be a Spartan-2.  These need both a 2.5V
and a 3.3V supply, and they aren't available in PLCC packaging, but
other than that they seem like they fit the bill.

p.