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Altera_Forum's avatar
Altera_Forum
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13 years ago

Constraining ic delays

Hi all,

I am synthesising my project and i am having timing violations wrt to IC delays. My cell delays are under control but dont know why even after adding a proper sdc the tool is not able to meet setup.

I know the tool does add additional delays to meet the hold requirements but my priority is setup and i also have switched off the "optimize all hold paths" constraint.

The cell delays in a path is around 2ns while the IC delays shoots upto 5ns.

I dont want to use a logic lock constraint is there any othe way to meet 200Mhz for this path even if i take a 60-40 ratio of IC- CELL delays in each path.

The sdc is cross checked and i have entered my requirements properly.

THANKS

12 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    okkk thanks RYSC you were a gr8 help to me..will try your ideas...thanks..

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor

    One more question RYSC can over constraining help...i mean i want to meet 200 Mhz and i ran the design with 250 Mhz ..