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[Synthesis/STA] PVT vs OCV vs Corner

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ivlsi

ivlsi

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Hi All,

What difference between PVT, OCV and Corner?

Is the PVT the Operation Condition?

Is the OCV the variations on a given PVT?

Is the Corner and OCV the same?

Thank you!
 

Hi ,
>Is the PVT the Operation Condition?
Yes. This is correct
>Is the OCV the variations on a given PVT?
Yes. This is right. IT may be a process, voltage and temperature
>Is the Corner and OCV the same?
No. This is not correct. Corners are extraction corners. During fabrication, due to process variation, a wire may have diffrent R and C. To cover these foundry will give various corner nxtgrd files.
Using these we have to extract the design in suggested corners and close the timing.
 
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    ivlsi

    ivlsi

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"nxtgrd files" - never heard about these files previously... Could you please provide more details? What information contains these files? How to use them?
What tool can do the RC-extraction?
 

Hi,

In P& R when we route the nets, we will be having info about Length and width of the nets.
But we are not sure of R&C of these nets. To get these values we use the nxtgrd files with an extractor (ex:Star-RC, QRC and so on).
nxtgrd used by Star-RC. other tools use other format. These files are given by foundry.
 

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pandit.vlsi said:
nxtgrd used by Star-RC. other tools use other format. These files are given by foundry.
Click to expand...

How are these files look like? Are they just Look Up Tables to correlate between the route/net Width/Length and corresponded RC values (like in WLM files)?
 

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