Stratix IV vs. Stratix iii

[Altera_Forum]

Hello all, 

 i am now upgrade from using stratix iii to stratix IV, what i know is that stratix IV is 45n technology, but stratix iii is a 65n technology.  i expected that when synthesizing the same design on startix iii and IV, stratix IV may give a high performance than startix iii, but the delay i got from stratix iii using Classic Timing Analyzer and TimeQuest Timing Analyzer is better than the delay i got in stratix IV using the TimeQuest Timing Analyzer.  I kept the same optimization options in both projects.  Please anyone have an explanation for this issue ?  I am using Quartus II v. 9.0 on centos, and my design is approximately has 2700 ALUTs.  Thanks in Advance Best Regards.

[Altera_Forum]

--- Quote Start ---  Hello all,  i am now upgrade from using stratix iii to stratix IV, what i know is that stratix IV is 45n technology, but stratix iii is a 65n technology.  i expected that when synthesizing the same design on startix iii and IV, stratix IV may give a high performance than startix iii, but the delay i got from stratix iii using Classic Timing Analyzer and TimeQuest Timing Analyzer is better than the delay i got in stratix IV using the TimeQuest Timing Analyzer.  I kept the same optimization options in both projects.  Please anyone have an explanation for this issue ?  I am using Quartus II v. 9.0 on centos, and my design is approximately has 2700 ALUTs.  Thanks in Advance Best Regards.  --- Quote End ---    Hi,  did you convert all your timing assignments into the SDC-file ? What about the speed grade of the device ? Be aware that TimeQuest treats the detected clocks as related.  Kind regards  GPK