RE: GAL vs CPLD

Hi,

I've order a TOP853 with PLCC adapter on ebay, I hope it works with windows
7...
Any idea on the program I can used to produce the file to burn in the  gal ?

In 1985 I used PALASM...

Any advices ?

thanks

--
didier

-----Message d'origine-----
De : owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] De la part de Baltissen, GJPAA
(Ruud)
Envoyé : mardi 18 septembre 2012 07:41
À : cbm-hackers@musoftware.de
Objet : RE: GAL vs CPLD

Hallo Didier,


> GAL 22V10-15LPN               DIP24   8.20 Euro
> CPLD MAX7000 EPM7032 LC44-15  PLCC44  3.20 Euro


> Is the -15 the speed of the component ? 

Indeed, for both.

 
> Are they replaceable by each other ?

No, they are certainly not pincompatible.


> Any idea on the difference ?

This GAL has 20 usuable pins, partly only input, partly I/O. The MAX more
then 32, mostly I/O (IIRC).

The GAL with its DIP can be removed easier out of its socket whem to be
(re)programmed then the MAX. OTOH the S-version should have JTAG and is in
circuit programmable.


> but I need an address decoding external to the CPLD (to reduce the 
> number of io used on the cpld)

Please explain, this doen't make sense. Unless you need more glue logic than
your CPLD can provide.


> but no idea on how to program them

For about $40 you can buy the TOP853: 
http://www.ebay.com/itm/top853-USB-universal-programmer-EPROM-MCU-GAL-PI
C-/160378432470
Just picked the first hit on Google. Mine came with a PLCC44-to-DIP40
adapter. 


> (I thought a second CPLD would be too expensive)

Cheaper than a GAL, more flexible than LS. But then what about a bigger
CPLD?


> What is best GAL or CPLD ?

IMHO this depends on the availability of the parts and the price. 


--
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