Corrected the fill generation script to avoid dropping fill outside
the chip area if the chip area is not an exact multiple of the check
step. Also added a density check script for running on final GDS
with fill (the output of the fill generation script).
diff --git a/sky130/custom/scripts/generate_fill.py b/sky130/custom/scripts/generate_fill.py
index cb481d9..1f9254f 100755
--- a/sky130/custom/scripts/generate_fill.py
+++ b/sky130/custom/scripts/generate_fill.py
@@ -113,11 +113,11 @@
print('set xmax [lindex $fullbox 2]', file=ofile)
print('set xmin [lindex $fullbox 0]', file=ofile)
print('set fullwidth [expr {$xmax - $xmin}]', file=ofile)
- print('set xtiles [expr {int(ceil($fullwidth / $stepwidth))}]', file=ofile)
+ print('set xtiles [expr {int(ceil(($fullwidth + 0.0) / $stepwidth))}]', file=ofile)
print('set ymax [lindex $fullbox 3]', file=ofile)
print('set ymin [lindex $fullbox 1]', file=ofile)
print('set fullheight [expr {$ymax - $ymin}]', file=ofile)
- print('set ytiles [expr {int(ceil($fullheight / $stepheight))}]', file=ofile)
+ print('set ytiles [expr {int(ceil(($fullheight + 0.0) / $stepheight))}]', file=ofile)
print('box size $stepwidth $stepheight', file=ofile)
print('set xbase [lindex $fullbox 0]', file=ofile)
print('set ybase [lindex $fullbox 1]', file=ofile)
@@ -130,6 +130,8 @@
print(' set ylo [expr $ybase + $y * $stepheight]', file=ofile)
print(' set xhi [expr $xlo + $stepwidth]', file=ofile)
print(' set yhi [expr $ylo + $stepheight]', file=ofile)
+ print(' if {$xhi > $fullwidth} {set xhi $fullwidth}', file=ofile)
+ print(' if {$yhi > $fullheight} {set yhi $fullheight}', file=ofile)
print(' box values $xlo $ylo $xhi $yhi', file=ofile)
# The flattened area must be larger than the fill tile by >1.5um
print(' box grow c 1.6um', file=ofile)
@@ -145,6 +147,8 @@
print(' property GDS_FILE ""', file=ofile)
# Set boundary using comment layer, to the size of the step box
# This corresponds to the "topbox" rule in the wafflefill(tiled) style
+ print(' select top cell', file=ofile)
+ print(' erase comment', file=ofile)
print(' box values $xlo $ylo $xhi $yhi', file=ofile)
print(' paint comment', file=ofile)
print(' puts stdout "Writing GDS. . . "', file=ofile)
