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I have been rebuilding some Virtex E and Virtex 2 designs targeting Spartan 3s. No problems so far and really looking forward to get some samples. I have heard that the first samples will be XC3S1000 (don't know the packaging).
One think I like is that the 3s400, 3S1000 and 3S1500 are available in the FG456 package. That is a big improvement because in Virtex II you could have a 2V500 and a 2V1000 in a FG456 but that was it. If you wanted to go for a 2V1500 bad news, you had to go for an FG676 or bigger.
Another think is that they have only characterised a -4 speed grade, and the first tests I have run are not as good as I thought, it seems slower than Virtex 2 equivalent and I was expecting it to be faster because the geometry is going down.
We'll see maybe is ISE5.2i + SP1 a bit crap in that aspect. I guess when they get the frst samples they will update these figures.
Does anybody know prices? I mean an estimation, are there any Xilinx employees in the forum who could help?