AR# 575: Design doesn't fit using 5.1, but used to fit with 5.0
AR# 575
Design doesn't fit using 5.1, but used to fit with 5.0
Description
A design that used to fit using the 5.0.0 XEPLD software no longer fits using the 5.1.0 software (with no design changes).
Solution
The 5.1.0 software uses a different logic optimization routine than the 5.0.0, and in some cases may not optimize the design as efficiently as the older version.
One way to allow the 5.1.0 software to behave more like the 5.0.0 software is to add the following global attribute to a schematic:
DENSITY_OPT=OFF
To add this option in a top-level PLD file, insert the following statement before the EQUATIONS keyword: