fillNotch inserts are off grid in virtuoso

[Nathaniel Gaskin]

In Encounter, we verifyGeometry to find violations of spacing/width/
etc ruls governed by the tech LEF.

When we run the fillNotch command, nearly all of the added metal
structures are placed off grid (see picture offgridfillNotch). The
report file does not show off-grid locations, but the DEF file we
write out at the end shows many special nets on the smaller grid. Our
tech LEF specifies the following:



UNITS

DATABASE MICRONS 2000 ;

END UNITS



MANUFACTURINGGRID 0.0050 ;



fillNotch places metal on a 0.0005 grid, and while it reduces
violations shown in the verifyGeometry command it actually increases
DRC violations in Calibre. When we write out a DEF file from
Encounter to import into Virtuoso, the following message is printed
out:



Writing DEF file './output/pipeline_fill.def', current time is Thu
Apr 3 08:25:33 2008 ...

unitPerMicron=2000, dbgMicronPerDBU=0.000500, unitPerDBU=1.000000

DEF file './output/pipeline_fill.def' is written, current time is Thu
Apr 3 08:25:34 2008 ...



Suggesting that Encounter uses the grid of 0.0005 for everything.
However, all standard cells and all routed metal are placed on the
correct 0.005 grid - only fillNotch generated metal is placed off-
grid.


Has anyone had this problem before?