Modified the nwell-drawing code from the device generator provided
by Pepijn de Vos (pull request #259) to make the diffusion extents
and nwell surround minimum for the technology.
diff --git a/VERSION b/VERSION
index 19e25b6..7a7992a 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.316
+1.0.317
diff --git a/sky130/magic/sky130.tcl b/sky130/magic/sky130.tcl
index 638a422..b32a010 100644
--- a/sky130/magic/sky130.tcl
+++ b/sky130/magic/sky130.tcl
@@ -137,7 +137,7 @@
"sky130::mvsubconn_draw" pdk1
magic::add_toolkit_command $layoutframe "deep n-well region" \
"sky130::deep_nwell_draw" pdk1
- magic::add_toolkit_command $layoutframe "n-well region" \
+ magic::add_toolkit_command $layoutframe "n-well region with guard ring" \
"sky130::nwell_draw" pdk1
magic::add_toolkit_command $layoutframe "mcon" \
"sky130::mcon_draw" pdk1
@@ -451,22 +451,24 @@
proc sky130::nwell_draw {} {
set w [magic::i2u [box width]]
set h [magic::i2u [box height]]
- if {$w < 3.0} {
- puts stderr "Deep-nwell region width must be at least 3.0um"
+ # NOTE: Width and height are determined by the requirement for
+ # a contact on each side. There is not much that can be done
+ # with an guarded nwell smaller than that, anyway.
+ if {$w < 0.6} {
+ puts stderr "N-well region width must be at least 0.6um"
return
}
- if {$h < 3.0} {
- puts stderr "Deep-nwell region height must be at least 3.0um"
+ if {$h < 0.6} {
+ puts stderr "N-well region height must be at least 0.6um"
return
}
suspendall
tech unlock *
pushbox
pushbox
- box grow c 0.4um
+ box grow c 0.265um
paint nwell
popbox
- box grow c 0.03um
pushbox
box width 0
@@ -477,7 +479,6 @@
box grow s -0.3um
paint nsc
popbox
- box grow c 0.1um
paint nsd
popbox
@@ -490,7 +491,6 @@
box grow w -0.3um
paint nsc
popbox
- box grow c 0.1um
paint nsd
popbox
@@ -504,7 +504,6 @@
box grow w -0.3um
paint nsc
popbox
- box grow c 0.1um
paint nsd
popbox
@@ -517,7 +516,6 @@
box grow n -0.3um
box grow s -0.3um
paint nsc
- box grow c 0.1um
paint nsd
popbox
