Modified the rule for generating COREID so that it is not generated
automatically by the SONOS layer. This is in conflict with the
SkyWater rule, but the SkyWater rule pertains to a specific NV RAM
core cell that is not part of the open PDK, and it is not a
manufacturing rule error. Removing COREID from around SONOS solves
more problems than it creates.
diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 0ceb6fb..aaf5bad 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -971,13 +971,13 @@
calma 80 20
#----------------------------------------------------------------
-# SONOS requires COREID around area (areaid.ce). Also, the
-# coreli layer indicates a cell needing COREID. Also, devices
-# npd, npass, and ppu indicate a COREID cell.
+# The coreli layer indicates a cell needing COREID. Also,
+# devices npd, npass, and ppu indicate a COREID cell. NOTE:
+# SONOS does not use COREID, counter to SkyWater rules.
#----------------------------------------------------------------
layer COREID
- bloat-all nsonos,coreli,ppu,npd,npass,corepvar,corenvar CELLBOUND
+ bloat-all coreli,ppu,npd,npass,corepvar,corenvar CELLBOUND
mask-hints COREID
calma 81 2
