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Today I am with a customer, and I have just seen a development Spartan2 board in their lab. It's was manufactured by Avnet, and the PCB is six layers Talking with their PCB-skilled guys confirmed my doubt: for a large FPGA with a lot of chip on the PCB, you have to go for 4 layers for signals and 2 layers for the power distribution, this, plus a lot of decoupling
bah, I doubt ... anyway, which EDA software do you use?