Thank you ! This is also the solution I have found. I have finished designing
the eZ80 part, placing the pins the best way to simplify my schematics. Next I
will do the same for the xilinx fpga chip. However, the hard part will be to
make the package for these chips since I have to be sure it maches the parts
footprint and haven't done it yet.

If anyone is interested in these chips, I would be pleased to share them.