Modified the tech file to correct the rule cap2m.8, which should
apply only to distance to via3 outside of the cap2m area, not
inside.
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 225663a..ed94c83 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -1468,6 +1468,13 @@
templayer mim2_bottom
bloat-all *mimcap2 *metal4
+ # Define areas where mim2cc is inside the boundary of mimcc
+ # by more than the contact surround
+ templayer mim2_contact_overlap
+ bloat-all *mimcap2 mimcc
+ shrink 60
+ and-not *mimcap2
+
# Note that metal fill is performed by the foundry and so is not
# an option for a cifoutput style.
@@ -4767,12 +4774,15 @@
surround *mimcap2 *metal4/m4 140 absence_illegal \
"Metal4 must surround MiM2 cap by %d (cap2m.3)"
- spacing via3,mimcc *mimcap2 80 touching_illegal \
+ spacing via3 *mimcap2 80 touching_illegal \
"MiM2 cap spacing to via3 < %d (cap2m.8 - via3.4)"
spacing *mimcap2 *metal4/m4 500 surround_ok \
"MiM2 cap spacing to unrelated metal4 < %d (cap2m.11)"
variants (full)
+ cifmaxwidth mim2_contact_overlap 0 bend_illegal \
+ "MiM2 cap contact must not cross MiM cap contact (cap2m.8)"
+
cifspacing mim2_bottom mim2_bottom 1200 touching_ok \
"MiM2 cap bottom plate spacing < %d (cap2m.2b)"
variants (fast),(full)
