AR# 5732: 1.5 XC4000XL Map - ERROR:x4kma:367 - An illegal carry configuration has been detected...
AR# 5732
1.5 XC4000XL Map - ERROR:x4kma:367 - An illegal carry configuration has been detected...
説明
Express design with no RLOCs fails to pack Carry chain.
ERROR:x4kma:367 - An illegal carry configuration has been detected for CY4 symbol "C14254_C6_C2" (output signal=C14254_C6_cout0_net). The required route-through cannot be performed because no more combinational pins are available. Please check the F/HMAPs for defining the usage of this carry comp (mapped physical logic cell).
ソリューション
This error appears to be related to the fact that Express does not RLOC any of the carry chains. Map needed more guidance than it was getting apparently. I was able to get this design to map successfully by adding the following RLOC attrubutes: