Newsgroups: comp.robotics
Path: cantaloupe.srv.cs.cmu.edu!rochester!udel!news.sprintlink.net!pcnet.com!circellar!carl.giles
From: carl.giles@circellar.com
Subject: GALS, PALS FOR THE HOME H
Message-ID: <9503180948.0DRMO00@circellar.com>
Organization: Circuit Cellar, Inc.
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Date: Sat, 18 Mar 95 09:48:00 -0500
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   News said:
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> From: mark.stephens@gsfc.nasa.gov (mark stephens)
> Newsgroups: comp.robotics,sci.electronic
> Subject: GALs, PALs for the home hobbiest... possible?
> Date: Wed, 08 Mar 1995 10:44:02 -0500
> Organization: NASA Goddard Space Flight Center -- Greenbelt, Maryland USA
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   Mark Stephens said:
> I have a microprocessor based controller board developed around Motorola's
> 68HC11.  It has expanded RAM and ROM and other I/O and so it uses two quad
> NOR gates chips as glue logic.  There is also an LCD which, due to it's
> slower than bus speed, is connected to a port.  I'd love to wrap all this
> up into one chip.
 
  There's a solution to your stated problem that get's you to your goal 
much faster than what was suggested, but you don't get a PAL programmer 
as a result.  The solution is Xicor's SLIC E SQUARED for the 68HC11. It 
is a 48 pin DIP (PLCC available) that interfaces directly to the 68HC11 
(no glue).  It provides you with 8k of E-SQUARED PROM, 16 8-BIT RAM 
registers, and two extra 8-BIT I/O PORTS.  The ports can replace the ones 
used for ADDR/DATA, or can provide the latched address that the data 
bus takes up (I only have the data sheet for the 8051 version, so there 
may be some differences in the HC11 implementation.)  The E-SQUARED PROM 
comes programmed with a monitor program that allows you to connect the 
serial port to a PC, download a program into E-SQUARED PROM (there are 
two separate 4k sections so code can execute out of one, while the write 
cycle completes) and then execute the code on command.  When code is 
debugged, just replace the monitor program with JUMP-TO code.
 
  Xicor sells a kit with a chip, the necessary data sheet, and a 3 1/2" 
floppy with the XSLIC PC software for $15 U.S.  For an address where 
you can get more information, ask Ray Kahidi at:
                  rkahidi@smtpgate.xicor.com
  You won't end up with a PLD programmer for use on future projects, 
but you might find a quick path to your immediate goal, with some 
software development help and maybe extra ROM space for free! (I 
don't know how much program area a 68HC11 comes with in bare basic 
configuration.
 
  BTW... these chips are supposed to be real cheap, but in calling 
around, I found it was nearly as cheap to buy the $15 APP KIT, as 
buying the parts directly through a local distributor, and I don't 
have to buy MIN 40 pcs, and the distributor would have to order the 
40 pcs from the factory anyway!  Maybe time will make these more 
available.
 
    ___      _ 
 _--   --_ _-                    Regards,
-_       _-_                     Carl Giles
  --___--   -_                   ( carl.giles@circellar.com )
