Updated and corrected some of the parasitic extraction tables in
the magic techfile for sky130 (again). This corrects issues around
the use of the "isosub" layer in conjunction with the update in magic
version 8.3.248, defining "isosub" and "dnwell" as shield types to
substrate, and defining equivalent parasitic capacitances between
all layers and "isosub" or "dnwell".
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 8f4ff14..9d80aea 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -735,7 +735,7 @@
connect
*nwell,*nsd,*mvnsd,dnwell,pnp,photo *nwell,*nsd,*mvnsd,dnwell,pnp,photo
- pwell,*psd,*mvpsd,npn pwell,*psd,*mvpsd,npn
+ pwell,*psd,*mvpsd,npn,isosub pwell,*psd,*mvpsd,npn,isosub
*li,coreli,lifill *li,coreli,lifill
*m1,m1fill,obsmcon *m1,m1fill,obsmcon
#ifdef RERAM
@@ -5209,10 +5209,13 @@
#deep n-well
defaultareacap dnwell dwell 120
+#p-well
+defaultoverlap pwell well dnwell dwell 120
+
#n-well
# NOTE: This value not found in PEX files
defaultareacap nwell well 120
-defaultoverlap nwell well dnwell dwell 0
+defaultoverlap nwell well isosub dwell 120
#n-active
# Rely on device models to capture *ndiff area cap
@@ -5239,6 +5242,7 @@
#locali
defaultsidewall allli locali 33
+ defaultoverlap allli locali dnwell,isosub dwell 37
defaultareacap allli locali nwell,obswell,pwell well 37
defaultperimeter allli locali nwell,obswell,pwell well 41
defaultoverlap allli locali nwell,obswell,pwell well 37
@@ -5255,6 +5259,7 @@
#metal1
defaultsidewall allm1 metal1 45
+ defaultoverlap allm1 metal1 dnwell,isosub dwell 26
defaultareacap allm1 metal1 nwell,obswell,pwell well 26
defaultperimeter allm1 metal1 nwell,obswell,pwell well 41
defaultoverlap allm1 metal1 nwell,obswell,pwell well 26
@@ -5280,6 +5285,7 @@
#metal2
defaultsidewall allm2 metal2 50
+ defaultoverlap allm2 metal2 dnwell,isosub dwell 17
defaultareacap allm2 metal2 nwell,obswell,pwell well 17
defaultperimeter allm2 metal2 nwell,obswell,pwell well 38
defaultoverlap allm2 metal2 nwell,obswell,pwell well 17
@@ -5306,6 +5312,7 @@
#metal3
defaultsidewall allm3 metal3 63
+ defaultoverlap allm3 metal3 dnwell,isosub dwell 12
defaultareacap allm3 metal3 nwell,obswell,pwell well 12
defaultperimeter allm3 metal3 nwell,obswell,pwell well 41
defaultoverlap allm3 metal3 nwell,obswell,pwell well 12
@@ -5339,6 +5346,7 @@
#metal4
defaultsidewall allm4 metal4 67
# defaultareacap alltopm metal4 well 6
+ defaultoverlap allm4 metal4 dnwell,isosub dwell 8
areacap allm4/m4 8
defaultperimeter allm4 metal4 nwell,obswell,pwell well 37
defaultoverlap allm4 metal4 nwell,obswell,pwell well 8
@@ -5376,6 +5384,7 @@
#metal5
defaultsidewall allm5 metal5 127
# defaultareacap allm5 metal5 well 6
+ defaultoverlap allm5 metal5 dnwell,isosub dwell 6
areacap allm5/m5 6
defaultoverlap allm5 metal5 nwell,obswell,pwell well 6
defaultperimeter allm5 metal5 nwell,obswell,pwell well 39
