Corrected all of the parasitic capacitance values in the tables
based on the values and equations in the SkyWater Calibre PEX
decks, and verified by extracting an example with exhaustive
combinations of overlapping poly, local interconnect, and metal
layers.
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 48552e8..4c931c8 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -29,7 +29,7 @@
end
#----------------------------------------------------------
-# Status 7/5/20: Rev 1 (alpha):
+# Status 7/10/20: Rev 1 (alpha):
# First public release
#--------------------------------------------------------------
@@ -3658,9 +3658,9 @@
# planes from the planeorder stack, take care of the reflexive sideoverlap
# definitions, and generally clean up the section and make it more readable.
#
-# Also uses "units microns" statement, so all parasitic capacitance values
-# are taken directly from the source document PDS_035_03, in units of
-# aF/um^2 for area caps and aF/um for perimeter and sidewall caps.
+# Also uses "units microns" statement. All values are taken from the
+# document PEX/xRC/cap_models. Fringe capacitance values are approximated.
+# Units are aF/um^2 for area caps and aF/um for perimeter and sidewall caps.
#-------------------------------------------------------------------------
# Remember that device capacitances to substrate are taken care of by the
# models. Thus, active and poly definitions ignore all "fet" types.
@@ -3691,143 +3691,180 @@
#poly
# Do not extract parasitics from resistors
# defaultsidewall allpolynonfet active 22
-# defaultareacap allpolynonfet active 105
+# defaultareacap allpolynonfet active 106
# defaultperimeter allpolynonfet active 57
- defaultsidewall *poly active 63
- defaultareacap *poly active nwell,obswell,pwell well 63
- defaultperimeter *poly active nwell,obswell,pwell well 16
+ defaultsidewall *poly active 15
+ defaultareacap *poly active nwell,obswell,pwell well 106
+ defaultperimeter *poly active nwell,obswell,pwell well 55
#locali
- defaultsidewall allm1 metal1 113
- defaultareacap allm1 metal1 nwell,obswell,pwell well 37
- defaultperimeter allm1 metal1 nwell,obswell,pwell well 8
- defaultoverlap allm1 metal1 nwell well 37
+ defaultsidewall allli locali 8
+ defaultareacap allli locali nwell,obswell,pwell well 37
+ defaultperimeter allli locali nwell,obswell,pwell well 55
+ defaultoverlap allli locali nwell well 37
#locali->diff
- defaultoverlap allm1 metal1 allactivenonfet active 36
- defaultsideoverlap allm1 metal1 allactivenonfet active 9
+ defaultoverlap allli locali allactivenonfet active 37
+ defaultsideoverlap allli locali allactivenonfet active 55
#locali->poly
- defaultoverlap allm1 metal1 allpolynonres active 46
- defaultsideoverlap allm1 metal1 allpolynonres active 10
+ defaultoverlap allli locali allpolynonres active 94
+ defaultsideoverlap allli locali allpolynonres active 52
+ defaultsideoverlap *poly active allli locali 25
#metal1
- defaultsidewall allm1 metal1 113
- defaultareacap allm1 metal1 nwell,obswell,pwell well 17
- defaultperimeter allm1 metal1 nwell,obswell,pwell well 8
+ defaultsidewall allm1 metal1 29
+ defaultareacap allm1 metal1 nwell,obswell,pwell well 26
+ defaultperimeter allm1 metal1 nwell,obswell,pwell well 41
defaultoverlap allm1 metal1 nwell well 26
-#metal1->locali
- defaultoverlap allm1 metal1 allactivenonfet active 36
- defaultsideoverlap allm1 metal1 allactivenonfet active 9
-
#metal1->diff
- defaultoverlap allm1 metal1 allactivenonfet active 36
- defaultsideoverlap allm1 metal1 allactivenonfet active 9
+ defaultoverlap allm1 metal1 allactivenonfet active 26
+ defaultsideoverlap allm1 metal1 allactivenonfet active 41
#metal1->poly
- defaultoverlap allm1 metal1 allpolynonres active 46
- defaultsideoverlap allm1 metal1 allpolynonres active 10
+ defaultoverlap allm1 metal1 allpolynonres active 45
+ defaultsideoverlap allm1 metal1 allpolynonres active 47
+ defaultsideoverlap *poly active allm1 metal1 17
+
+#metal1->locali
+ defaultoverlap allm1 metal1 allli locali 114
+ defaultsideoverlap allm1 metal1 allli locali 59
+ defaultsideoverlap allli locali allm1 metal1 35
#metal2
- defaultsidewall allm2 metal2 101
- defaultareacap allm2 metal2 nwell,obswell,pwell well 12
- defaultperimeter allm2 metal2 nwell,obswell,pwell well 6
- defaultoverlap allm2 metal2 nwell well 13
+ defaultsidewall allm2 metal2 27
+ defaultareacap allm2 metal2 nwell,obswell,pwell well 17
+ defaultperimeter allm2 metal2 nwell,obswell,pwell well 41
+ defaultoverlap allm2 metal2 nwell well 38
#metal2->diff
- defaultoverlap allm2 metal2 allactivenonfet active 14
- defaultsideoverlap allm2 metal2 allactivenonfet active 7
+ defaultoverlap allm2 metal2 allactivenonfet active 17
+ defaultsideoverlap allm2 metal2 allactivenonfet active 41
#metal2->poly
- defaultoverlap allm2 metal2 allpolynonres active 16
- defaultsideoverlap allm2 metal2 allpolynonres active 7
+ defaultoverlap allm2 metal2 allpolynonres active 24
+ defaultsideoverlap allm2 metal2 allpolynonres active 41
+ defaultsideoverlap *poly active allm2 metal2 11
+
+#metal2->locali
+ defaultoverlap allm2 metal2 allli locali 38
+ defaultsideoverlap allm2 metal2 allli locali 46
+ defaultsideoverlap allli locali allm2 metal2 22
#metal2->metal1
- defaultoverlap allm2 metal2 allm1 metal1 39
- defaultsideoverlap allm2 metal2 allm1 metal1 10
+ defaultoverlap allm2 metal2 allm1 metal1 134
+ defaultsideoverlap allm2 metal2 allm1 metal1 67
+ defaultsideoverlap allm1 metal1 allm2 metal2 48
#metal3
- defaultsidewall allm3 metal3 102
- defaultoverlap allm3 metal3 nwell well 8
- defaultareacap allm3 metal3 nwell,obswell,pwell well 8
- defaultperimeter allm3 metal3 nwell,obswell,pwell well 5
+ defaultsidewall allm3 metal3 63
+ defaultoverlap allm3 metal3 nwell well 12
+ defaultareacap allm3 metal3 nwell,obswell,pwell well 12
+ defaultperimeter allm3 metal3 nwell,obswell,pwell well 41
#metal3->diff
- defaultoverlap allm3 metal3 allactive active 9
- defaultsideoverlap allm3 metal3 allactive active 6
+ defaultoverlap allm3 metal3 allactive active 12
+ defaultsideoverlap allm3 metal3 allactive active 41
#metal3->poly
- defaultoverlap allm3 metal3 allpolynonres active 10
- defaultsideoverlap allm3 metal3 allpolynonres active 6
+ defaultoverlap allm3 metal3 allpolynonres active 16
+ defaultsideoverlap allm3 metal3 allpolynonres active 44
+ defaultsideoverlap *poly active allm3 metal3 9
+
+#metal3->locali
+ defaultoverlap allm3 metal3 allli locali 21
+ defaultsideoverlap allm3 metal3 allli locali 47
+ defaultsideoverlap allli locali allm3 metal3 15
#metal3->metal1
- defaultoverlap allm3 metal3 allm1 metal1 15
- defaultsideoverlap allm3 metal3 allm1 metal1 7
+ defaultoverlap allm3 metal3 allm1 metal1 35
+ defaultsideoverlap allm3 metal3 allm1 metal1 55
+ defaultsideoverlap allm1 metal1 allm3 metal3 27
#metal3->metal2
- defaultoverlap allm3 metal3 allm2 metal2 39
- defaultsideoverlap allm3 metal3 allm2 metal2 10
+ defaultoverlap allm3 metal3 allm2 metal2 86
+ defaultsideoverlap allm3 metal3 allm2 metal2 70
+ defaultsideoverlap allm2 metal2 allm3 metal3 44
#ifdef METAL5
#metal4
- defaultsidewall allm4 metal4 102
+ defaultsidewall allm4 metal4 67
# defaultareacap alltopm metal4 well 6
areacap allm4/m4 8
defaultoverlap allm4 metal4 nwell well 8
- defaultperimeter allm4 metal4 well 5
+ defaultperimeter allm4 metal4 well 37
#metal4->diff
- defaultoverlap allm4 metal4 allactivenonfet active 7
- defaultsideoverlap allm4 metal4 allactivenonfet active 7
+ defaultoverlap allm4 metal4 allactivenonfet active 8
+ defaultsideoverlap allm4 metal4 allactivenonfet active 37
#metal4->poly
- defaultoverlap allm4 metal4 allpolynonres active 7
- defaultsideoverlap allm4 metal4 allpolynonres active 5
+ defaultoverlap allm4 metal4 allpolynonres active 10
+ defaultsideoverlap allm4 metal4 allpolynonres active 38
+ defaultsideoverlap *poly active allm4 metal4 6
+
+#metal4->locali
+ defaultoverlap allm4 metal4 allli locali 12
+ defaultsideoverlap allm4 metal4 allli locali 40
+ defaultsideoverlap allli locali allm4 metal4 10
#metal4->metal1
- defaultoverlap allm4 metal4 allm1 metal1 9
- defaultsideoverlap allm4 metal4 allm1 metal1 6
+ defaultoverlap allm4 metal4 allm1 metal1 15
+ defaultsideoverlap allm4 metal4 allm1 metal1 43
+ defaultsideoverlap allm1 metal1 allm4 metal4 16
#metal4->metal2
- defaultoverlap allm4 metal4 allm2 metal2 15
- defaultsideoverlap allm4 metal4 allm2 metal2 7
+ defaultoverlap allm4 metal4 allm2 metal2 20
+ defaultsideoverlap allm4 metal4 allm2 metal2 46
+ defaultsideoverlap allm2 metal2 allm4 metal4 22
#metal4->metal3
- defaultoverlap allm4 metal4 allm3 metal3 39
- defaultsideoverlap allm4 metal4 allm3 metal3 10
+ defaultoverlap allm4 metal4 allm3 metal3 84
+ defaultsideoverlap allm4 metal4 allm3 metal3 71
+ defaultsideoverlap allm3 metal3 allm4 metal4 43
#metal5
- defaultsidewall allm5 metal5 103
+ defaultsidewall allm5 metal5 127
# defaultareacap allm5 metal5 well 6
areacap allm5/m5 6
defaultoverlap allm5 metal5 nwell well 6
- defaultperimeter allm5 metal5 well 5
+ defaultperimeter allm5 metal5 well 39
#metal5->diff
- defaultoverlap allm5 metal5 allactivenonfet active 5
- defaultsideoverlap allm5 metal5 allactivenonfet active 5
+ defaultoverlap allm5 metal5 allactivenonfet active 6
+ defaultsideoverlap allm5 metal5 allactivenonfet active 39
#metal5->poly
- defaultoverlap allm5 metal5 allpolynonres active 5
- defaultsideoverlap allm5 metal5 allpolynonres active 5
+ defaultoverlap allm5 metal5 allpolynonres active 7
+ defaultsideoverlap allm5 metal5 allpolynonres active 40
+ defaultsideoverlap *poly active allm5 metal5 6
+
+#metal5->locali
+ defaultoverlap allm5 metal5 allli locali 8
+ defaultsideoverlap allm5 metal5 allli locali 41
+ defaultsideoverlap allli locali allm5 metal5 8
#metal5->metal1
- defaultoverlap allm5 metal5 allm1 metal1 7
- defaultsideoverlap allm5 metal5 allm1 metal1 5
+ defaultoverlap allm5 metal5 allm1 metal1 9
+ defaultsideoverlap allm5 metal5 allm1 metal1 43
+ defaultsideoverlap allm1 metal1 allm5 metal5 12
#metal5->metal2
- defaultoverlap allm5 metal5 allm2 metal2 9
- defaultsideoverlap allm5 metal5 allm2 metal2 6
+ defaultoverlap allm5 metal5 allm2 metal2 11
+ defaultsideoverlap allm5 metal5 allm2 metal2 46
+ defaultsideoverlap allm2 metal2 allm5 metal5 16
#metal5->metal3
- defaultoverlap allm5 metal5 allm3 metal3 15
- defaultsideoverlap allm5 metal5 allm3 metal3 7
+ defaultoverlap allm5 metal5 allm3 metal3 20
+ defaultsideoverlap allm5 metal5 allm3 metal3 54
+ defaultsideoverlap allm3 metal3 allm5 metal5 28
#metal5->metal4
- defaultoverlap allm5 metal5 allm4 metal4 39
- defaultsideoverlap allm5 metal5 allm4 metal4 10
+ defaultoverlap allm5 metal5 allm4 metal4 68
+ defaultsideoverlap allm5 metal5 allm4 metal4 83
+ defaultsideoverlap allm4 metal4 allm5 metal5 47
#endif (METAL5)
# Devices: Use document (...)
