Is there any bigger 5V or 5V-tolerant FPGA?

[technix]

I think I found a way out of this on 68010: that chip, while requires 5V operation, is capped at 2.4V VOH. So maybe just put a 510 ohm series resistor in there to soften the glitches if there is any and just wire that directly into the 3.3V system as-is.

[legacy]

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   

[technix]

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   

Maybe I am a signal contortionist, but I usually get it done within 4 layers. That point to point DDR3 bus of A13 is a single layer job for me, for example. I abuse and overuse pin swapping.

Even the power planes can be pretty contorted and I love scattering local regulators all around the main chips. That same A13 board has a TPS562200 right next to it as the memory VDD local regulator.

[legacy]

bah, I doubt ... anyway, which EDA software do you use?

[technix]

bah, I doubt ... anyway, which EDA software do you use?

KiCad. That is why I was complaining about it lagging on my machines back then.