Added more options for drawing guard rings to the device generator
for magic: 5V nwell with guard ring, 1.8V substrate guard ring,
and 5V substrate guard ring.
diff --git a/sky130/magic/sky130.tcl b/sky130/magic/sky130.tcl
index 0c9019c..9d8cb9d 100644
--- a/sky130/magic/sky130.tcl
+++ b/sky130/magic/sky130.tcl
@@ -141,12 +141,18 @@
magic::add_toolkit_command $layoutframe "substrate contact (1.8V)" \
"sky130::subconn_draw" pdk1
+ magic::add_toolkit_command $layoutframe "substrate guard ring (1.8V)" \
+ "sky130::subconn_guard_draw" pdk1
magic::add_toolkit_command $layoutframe "substrate contact (5.0V)" \
"sky130::mvsubconn_draw" pdk1
+ magic::add_toolkit_command $layoutframe "substrate guard ring (5.0V)" \
+ "sky130::mvsubconn_guard_draw" pdk1
magic::add_toolkit_command $layoutframe "deep n-well region" \
"sky130::deep_nwell_draw" pdk1
- magic::add_toolkit_command $layoutframe "n-well region with guard ring" \
+ magic::add_toolkit_command $layoutframe "n-well region with guard ring (1.8V)" \
"sky130::nwell_draw" pdk1
+ magic::add_toolkit_command $layoutframe "n-well region with guard ring (5.0V)" \
+ "sky130::mvnwell_draw" pdk1
magic::add_toolkit_command $layoutframe "mcon" \
"sky130::mcon_draw" pdk1
magic::add_toolkit_command $layoutframe "via1" \
@@ -455,6 +461,120 @@
}
#----------------------------------------------------------------
+# Helper function for drawing guard rings.
+# Assumes that a box exists and defines the centerlines of the
+# guard ring contacts.
+# ctype = type to paint for contact
+# dtype = type to paint for diffusion
+#----------------------------------------------------------------
+
+proc sky130::guard_ring_draw {ctype dtype} {
+ pushbox
+ box width 0
+ box grow c 0.085um
+ paint li
+ pushbox
+ box grow n -0.3um
+ box grow s -0.3um
+ paint $ctype
+ popbox
+ paint $dtype
+ popbox
+
+ pushbox
+ box height 0
+ box grow c 0.085um
+ paint li
+ pushbox
+ box grow e -0.3um
+ box grow w -0.3um
+ paint $ctype
+ popbox
+ paint $dtype
+ popbox
+
+ pushbox
+ box move n [box height]i
+ box height 0
+ box grow c 0.085um
+ paint li
+ pushbox
+ box grow e -0.3um
+ box grow w -0.3um
+ paint $ctype
+ popbox
+ paint $dtype
+ popbox
+
+ pushbox
+ box move e [box width]i
+ box width 0
+ box grow c 0.085um
+ paint li
+ pushbox
+ box grow n -0.3um
+ box grow s -0.3um
+ paint $ctype
+ popbox
+ paint $dtype
+ popbox
+}
+
+#----------------------------------------------------------------
+
+proc sky130::subconn_guard_draw {} {
+ set w [magic::i2u [box width]]
+ set h [magic::i2u [box height]]
+ # NOTE: Width and height are determined by the requirement for
+ # a contact on each side. There is not much that can be done
+ # with an guarded nwell smaller than that, anyway.
+ if {$w < 0.6} {
+ puts stderr "Substrate guard ring width must be at least 0.6um"
+ return
+ }
+ if {$h < 0.6} {
+ puts stderr "Substrate guard ring height must be at least 0.6um"
+ return
+ }
+ suspendall
+ tech unlock *
+ pushbox
+
+ sky130::guard_ring_draw psc psd
+
+ popbox
+ tech revert
+ resumeall
+}
+
+#----------------------------------------------------------------
+
+proc sky130::mvsubconn_guard_draw {} {
+ set w [magic::i2u [box width]]
+ set h [magic::i2u [box height]]
+ # NOTE: Width and height are determined by the requirement for
+ # a contact on each side. There is not much that can be done
+ # with an guarded nwell smaller than that, anyway.
+ if {$w < 0.6} {
+ puts stderr "Substrate guard ring width must be at least 0.6um"
+ return
+ }
+ if {$h < 0.6} {
+ puts stderr "Substrate guard ring height must be at least 0.6um"
+ return
+ }
+ suspendall
+ tech unlock *
+ pushbox
+
+ sky130::guard_ring_draw mvpsc mvpsd
+
+ popbox
+ tech revert
+ resumeall
+}
+
+#----------------------------------------------------------------
proc sky130::nwell_draw {} {
set w [magic::i2u [box width]]
@@ -478,61 +598,46 @@
paint nwell
popbox
- pushbox
- box width 0
- box grow c 0.085um
- paint li
- pushbox
- box grow n -0.3um
- box grow s -0.3um
- paint nsc
- popbox
- paint nsd
- popbox
-
- pushbox
- box height 0
- box grow c 0.085um
- paint li
- pushbox
- box grow e -0.3um
- box grow w -0.3um
- paint nsc
- popbox
- paint nsd
- popbox
-
- pushbox
- box move n [box height]i
- box height 0
- box grow c 0.085um
- paint li
- pushbox
- box grow e -0.3um
- box grow w -0.3um
- paint nsc
- popbox
- paint nsd
- popbox
-
- pushbox
- box move e [box width]i
- box width 0
- box grow c 0.085um
- paint li
- pushbox
- box grow n -0.3um
- box grow s -0.3um
- paint nsc
- popbox
- paint nsd
- popbox
+ sky130::guard_ring_draw nsc nsd
popbox
tech revert
resumeall
}
+#----------------------------------------------------------------
+
+proc sky130::mvnwell_draw {} {
+ set w [magic::i2u [box width]]
+ set h [magic::i2u [box height]]
+ # NOTE: Width and height are determined by the requirement for
+ # a contact on each side. There is not much that can be done
+ # with an guarded nwell smaller than that, anyway.
+ if {$w < 0.6} {
+ puts stderr "MV N-well region width must be at least 0.6um"
+ return
+ }
+ if {$h < 0.6} {
+ puts stderr "MV N-well region height must be at least 0.6um"
+ return
+ }
+ suspendall
+ tech unlock *
+ pushbox
+ pushbox
+ box grow c 0.415um
+ paint nwell
+ popbox
+
+ sky130::guard_ring_draw mvnsc mvnsd
+
+ popbox
+ tech revert
+ resumeall
+}
+
+#----------------------------------------------------------------
+
proc sky130::deep_nwell_draw {} {
set w [magic::i2u [box width]]
set h [magic::i2u [box height]]
