Answers Database
1.5i, 2.1i Map - 4KXLA design seg faults in Map after "Removing unused logic..."
Record #4991
Product Family: Software
Product Line: FPGA Implementation
Product Part: map
Product Version: 1.5i
Problem Title:
1.5i, 2.1i Map - 4KXLA design seg faults in Map after "Removing unused logic..."
Problem Description:
A case has been seen where map crashes due to a bug involving constant
pushing into CLBs that result from 5-input EQNs.
Solution 1:
Possible workarounds:
1. don't use 5-input EQNs - Many synthesis tools give best results when
targetting 4-input EQNs
2. If 5-input EQNs are required, then if possible, force the synthesis tool
to output ROMs (constants are not pushed into ROMs) or F and HMAPs to
implement the 5-input function
3. add NOMERGE to all 5-input EQN inputs - constants are not pushed
thru NOMERGE
This problem will be fixed in the first major release (as yet unnamed) after version 2.1i.
End of Record #4991 - Last Modified: 06/26/99 14:09 |
