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An Encounter error of supporting POLYGON with 45 degree edges

Hi all,

I got a lot of errors when reading Bond pad Lef information in Encounter. It happened during special routing.All these errors are relative to supporting POLYGON with 45 degree edges. I am using Encounter 7.1.

Reading LEF technology info...

*ERROR* "/home/cadence/TSMC/IO_lib/tpbn90nv_130a/tpbn90nv_130a_sefp9/TSMCHOME/digital/Back_End/lef/tpbn90nv_130a/cup/9lm/9M_6X2Y/lef/tpbn90nv_9lm.lef", line 59: VERSION must be 5.6 or higher to support POLYGON with 45 degree edges at or near "4.780"

In bond pad lef file, line 59:

POLYGON 53.000 70.220 51.220 72.000 51.220 3.000 53.000 4.780 ;

Ang help. Thanks in advanced

Kari over 15 years ago

Hi,
Change the VERSION statement in the top of the LEF file to be 5.6 and see if it reads in cleanly.

- Kari
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Greatrebel over 15 years ago

The VERSION statement in the std cell lef file is 5.5, there is not VERSION statement defined in bond pad lef file. Anyway I changed it to 5.6 in std cell lef. Those errors were gone, thank you very much for that. But I am wondering whehter this change would affect other things or hurt the design?
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Kari over 15 years ago

You could try adding the version statement to the bond pad lef, if you didn't want to change the stdcell lef.
This shouldn't hurt anything. Everything in LEF 5.5 is still valid in LEF 5.6. But the bond pad LEF was using POLYGON, which is a LEF 5.6 thing, like the error message said.
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Kari over 15 years ago

To be more correct, POLYGON with 45-degree shapes is what was new with LEF 5.6.
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Greatrebel over 15 years ago

thank you very much for your help!
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