[Coco] MPI replacements?

[Phill Harvey-Smith]

On 09/07/2010 21:15, Rob Rosenbrock wrote:
> Rather than a GAL or discrete logic, have you ever considered using a
> small ROM? I've seen one implemented utilizing it as a truth table.

The problem with using a Rom or a GAL/PAL is that you need an external 
programmer to program the logic into them. Programmers for these devices 
are generally quite expensive.

The advantage with a CPLD is that they are generally in circuit 
programmable with a cable that can be purchased or made relatively 
cheaply. Also it makes changing the logic much easier. They are 
generally available in PLCC (such as the Xilinx 9536/9572/95108 and the 
XL versions) which means they can be socketed and don't then need any 
surface mount soldering.

Just my 2p/2c :)

Phill.