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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