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Message
From: John Sheahan <jrsheahan@o...>
Date: Wed, 26 Nov 2003 13:06:35 +1100
Subject: Re: [oc] OT : FPGA price
On Tue, Nov 25, 2003 at 10:54:27AM +0000, Martin.J Thompson wrote:
> Some responses (or are you trolling? :-)
read a bit that way didn't it.. :)
> >-no 2A power up spike,
>
> None of that in V-II or Spartan-III
the virtex's are specified to draw a big power-on surge actually.
Thats if you bring up the supplies in the correct order.
No idea what happens in the 'wrong' order.
>
> Not a good number to use. I *want* a Tjmax - then I can simulate the thermals of my system, with whatever heatsinks and fans I might or might not use and ensure that it is not exceeded. Or use the timing tool to derate. Of couse, this needs a good package model. Ambient temps are no use unless you are doing an average design.
Last package model I saw was a theta-JA resistance, so max ambient
still matters.
As does Tjmax and the (probably data specific) power dissiption.
>
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