PVS Rule writing

Hi All,

 How to write PVS rules to  check the  perimeter of all the nets individually? I don't want to check perimeter of a particular layer.

For example for routing connection M1, Via1, M2, Via2, M3, Via3 M4 are used. Now I want to highlight all the connection which have perimeter more than 5micron. Perimeter value includes  M1, Via1, M2, Via2, M3, Via3, M4  as single layer depending upon connectivity of the connection. 

Thank you in advance.

Regards

Pranay

Hi Pranay

Sorry to keep you waiting. Here are my comments:

a. I have checked internally and confirmed that measurement of total net length cannot be easily done. This is because of the available cmds and also because of the definition of net length itself. E.g. a net may have multiple branches. How do we define the length for such a case? If the longest branch is to be used, how to filter the shapes for the other branches?

b. For perimeter, perhaps you can try the following:

rule checkPerim {
   antenna m1 m2 m3 -gt 0 -expr "perimeter(m1)+perimeter(m2)+perimeter(m3)" -rdb "perim.rdb"
}

At the end of the DRC run, egrep for "VALUE" in perim.rdb file:

terminal> egrep "VALUE" perim.rdb

=== perim.rdb ===
test_net 2000
checkPerim:antLay_1
1 1 3 Mar 17 11:25:48 2019
ANTENNA -gt 0.000000 m1 m2 m3 -rdb perim.rdb checkPerim:antLay
CELL=test_net FPC=1 NET=1 NETNAME=myNet2 VALUE=7.960000
m1 AREA= PERIMETER=1.580000 COUNT= DBCOUNT=1
...

There will be some inaccuracies because the ends of each shape might be double counted. You can try to do some more layer processing to see if this can be resolved.


Best regards
Quek

Hi Pranay

Sorry to keep you waiting. Here are my comments:

a. I have checked internally and confirmed that measurement of total net length cannot be easily done. This is because of the available cmds and also because of the definition of net length itself. E.g. a net may have multiple branches. How do we define the length for such a case? If the longest branch is to be used, how to filter the shapes for the other branches?

b. For perimeter, perhaps you can try the following:

rule checkPerim {
   antenna m1 m2 m3 -gt 0 -expr "perimeter(m1)+perimeter(m2)+perimeter(m3)" -rdb "perim.rdb"
}

At the end of the DRC run, egrep for "VALUE" in perim.rdb file:

terminal> egrep "VALUE" perim.rdb

=== perim.rdb ===
test_net 2000
checkPerim:antLay_1
1 1 3 Mar 17 11:25:48 2019
ANTENNA -gt 0.000000 m1 m2 m3 -rdb perim.rdb checkPerim:antLay
CELL=test_net FPC=1 NET=1 NETNAME=myNet2 VALUE=7.960000
m1 AREA= PERIMETER=1.580000 COUNT= DBCOUNT=1
...

There will be some inaccuracies because the ends of each shape might be double counted. You can try to do some more layer processing to see if this can be resolved.


Best regards
Quek

Hi Quek,

Thank you very much, for the help.

Is working properly as you suggested. 

Best regards

Pranay