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Altera_Forum
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16 years ago

Stratix IV vs. Stratix iii

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.

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    --- 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