I have been attempting to implement the or1200 soc on a Spartan 3 board
from Xess. I have been having a very difficult time trying to get the
design to operate stablely. Sometimes just changing what lines I am
monitoring with a logic analyzer make the difference between operating and
not operating. Simulations say everything should work. Are there any
suggestions for nets that I could apply constraints to that might make a
difference.