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Why doing overunder without GROW increases HPN/FPN values?

dummyfill

Hi, 

I have a rules file, where we are trying find all polygons on say M1. Also, we want to merge polygons which are within a certain distance. So, we have the following in rules file (rule.pvl):

// get all M1 outside SRAM

active_non_array_0 = NOT M1 SRAM_MARKER

// Merge all polygons within 100 nm

active_0 = SIZE active_non_array_0 OVERUNDER BY 0.100

After the above overunder step, the FPN and HPN count are more than from generation of active_non_array_0. However, if I add a grow step in between the two rules above:

active_non_array_0 = NOT M1 SRAM_MARKER

active_temp01 = GROW active_non_array_0 -top 0.2 -bottom 0.2 -right 0.2 -left 0.2 -sequential

active_0 = SIZE active_temp01 OVERUNDER BY 0.100

then HPN/FPN number decreases significantly. 

What is happening in the first case, why does FPN number increase? Also, does the number inside paranthesis below, give us the total number of polygons in the output? 

 Total DRC Results                 : 35788023 (2357970903) 

Is there a way to get the total number of vertices ? 

Thanks

Srivaths

  • Andrew Beckett

    Those don't look like PVL rules to me - are you actually using PVS? Your question wasn't very explicit.

    I don't tend to support PVS on a day to day basis, so this is not my main area of expertise (a long time ago I used to cover physical verification tools in depth, but not so much nowadays).

    Also, what do the terms FPN and HPN mean - they're not familiar to me?

    Regards,

    Andrew.

  • dummyfill
    Thanks Andrew for the reply. These are svrf commands and we are using PVS to extract the shapes. FPN: starting from the top cell and looking into all levels of hierarchy, the number of shapes seen in the layer. HPN: Number of shapes in the layer cell by cell without including sub-hierarchy. Is there a separate forum for PVS users?
  • Andrew Beckett

    There's no separate forum for PVS - here is as good as any.

    Maybe you should just take this to customer support? That said, I'm not sure we can offer support on writing SVRF rules (since that is a Mentor Graphics language) but probably can give guidance on doing the same thing using PVL.

    Regards,

    Andrew.

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