X-Message-Number: 25158
From: 
Date: Fri, 26 Nov 2004 02:00:05 EST
Subject: Re: CryoNet #25138 FPGA

From T. Donaldson:
> Again, it's essential to the working of our neurons that their 
> connections are changeable and none of them must persist. If I 
> understand how FPGAs work, we can program them once but not more
> than once. So that we'd want changeable FPGAs.
> 
> 
What you say applies to PLD (Programmable Logical Device) such the old GAL 

16V8. They would contain one neuron, can't be reprogrammed without UV light, and
so on. This is no more true with the next generation, the CPLD (it is not 
true neither with the GAL22V10, a more advanced PLD).

FPGA are another matter, one chip can contains millions of neurons and can be 
reprogrammed in microseconds, that is the "F" in FPGA. 

Yvan Bozzonetti.


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