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Xilinx Spartan 3/3A Question...

Hi guys:

I've just started my first project using the Xilinx Spartan-3 FPGA
development kit and I had a quick question.

When I visit the Xilinx website and look at their software and
manuals, I see a lot of support for the Spartan-3A (mine is a
Spartan-3, no "A"). What is the functional difference between these
two versions in terms of software? I realize the hardware differences
between the two chips, but can some or all of the software, libraries,
etc. be used interchangeably between the 3 and the 3A?

Thanks for any advice you can lend me.