Added the "isosub" to the cifinput and cifoutput sections, mapping
it to the "substrate cut" (GDS 81:53) layer. This allows substrate
regions to extract independently. Note: Currently this may require
copying the "isosub" layer up through the entire hierarchy to the
top level for the extraction to work correctly, pending a commit of
ongoing work to enhance the substrate extraction method in magic.
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 626abf2..ba24557 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -755,6 +755,13 @@
calma 64 13
#----------------------------------------------------------------
+# SUBCUT
+#----------------------------------------------------------------
+
+ layer SUBCUT isosub
+ calma 81 53
+
+#----------------------------------------------------------------
# NWELL
#----------------------------------------------------------------
@@ -2368,6 +2375,9 @@
layer dnwell DNWELL
labels DNWELL
+ layer isosub SUBCUT
+ labels SUBCUT
+
layer npn DNWELL
and-not NWELL,nwelcheck
and NPNID
@@ -3870,6 +3880,7 @@
calma NWELL 64 20
calma DIFF 65 20
calma DNWELL 64 18
+ calma SUBCUT 81 53
calma PWRES 64 13
calma TAP 65 44
# LVTN
@@ -4996,8 +5007,6 @@
substrate *ppdiff,*mvppdiff,space/w,pwell well $SUB -dnwell,isosub
-# Layer resistance: Use document xp018-PDS-v4_2_1.pdf
-
# Resistances are in milliohms per square
# Optional 3rd argument is the corner adjustment fraction
# Device values come from trtc.cor (typical corner)
