Answers Database
M1.4 CPLD: Some designs which used to fit in M1.3 failed with M1.4.
Record #2910
Product Family: Software
Product Line: CPLD Implementation
Product Part: hitop
Product Version: 1.4
Problem Title:
M1.4 CPLD: Some designs which used to fit in M1.3 failed with M1.4.
Problem Description:
Urgency: standard
General Description:
Some CPLD designs that fit with M1.3 in a particular device won't fit any more
with M1.4. In some cases the fitter will fail to meet the Timing
Specifications as well.
For backward compatibility with M1.3 do the following:
Solution 1:
Through the Design Manager invoke the Flow Engine. Go to Setup -> Options. Click
on Edit Template button in the Program Option Template box. Go to the Advanced
Optimization TAB of the XC9500 Implementation Options Template. Turn the
Multi-level Logic Optimization off by clicking on the button on the left of the
text.
Solution 2:
In the Advanced Optimization TAB, also change the "Collapsing Pterm Limit" value to 15.
End of Record #2910 - Last Modified: 12/07/99 10:50 |
