Added a new type "isosub" to the magic techfile, for isolating
areas of the p-substrate from the rest of a circuit.
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index fa71d6b..d18b620 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -141,6 +141,7 @@
types
# Deep nwell
dwell dnwell,dnw
+ dwell isosubstrate,isosub
# Wells
well nwell,nw
@@ -459,6 +460,7 @@
styles
styletype mos
dnwell cwell
+ isosub subcircuit
nwell nwell
pwell pwell
rpwell pwell ptransistor_stripes
@@ -2283,14 +2285,6 @@
variants *
labels WELLPIN port
- layer pwell SUBTXT,SUBPIN
- variants (vendor)
- labels SUBTXT port
- variants ()
- labels SUBTXT text
- variants *
- labels SUBPIN port
-
templayer nwellarea NWELL
copyup nwelcheck
@@ -2310,8 +2304,15 @@
layer pwell TAP,DIFF
and-not NWELL,nwelcheck
grow 130
+ or SUBTXT,SUBPIN
grow 420
shrink 420
+ variants (vendor)
+ labels SUBTXT port
+ variants ()
+ labels SUBTXT text
+ variants *
+ labels SUBPIN port
layer dnwell DNWELL
labels DNWELL
@@ -4920,7 +4921,7 @@
tiedown alldiffnonfet
- substrate *ppdiff,*mvppdiff,space/w,pwell well $SUB -dnwell
+ substrate *ppdiff,*mvppdiff,space/w,pwell well $SUB -dnwell,isosub
# Layer resistance: Use document xp018-PDS-v4_2_1.pdf
