diff --git a/VERSION b/VERSION
index d32a2cd..eafbe83 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.542
+1.0.543
diff --git a/gf180mcu/Makefile.in b/gf180mcu/Makefile.in
index 611110c..28d4156 100644
--- a/gf180mcu/Makefile.in
+++ b/gf180mcu/Makefile.in
@@ -1186,9 +1186,6 @@
 	rm -rf ${OPENLANE_STAGING_$*}/gf180mcu_as_sc_mcu7t3v3
 	mkdir ${OPENLANE_STAGING_$*}/gf180mcu_as_sc_mcu7t3v3
 	cp -rp ${AVALON_TECH_SOURCE}/openlane/gf180mcu_as_sc_mcu7t3v3 ${OPENLANE_STAGING_$*}
-	# drc_exclude.cells is called out in the config and needs to exist
-	# even though it is an empty file
-	touch ${OPENLANE_STAGING_$*}/gf180mcu_as_sc_mcu7t3v3/drc_exclude.cells
 
 io-%:
 	# Install custom additions to the I/O pad library
@@ -1268,6 +1265,8 @@
 		-lef cells/*/*_${$*_STACK}.lef \
 			annotate lefopts=-hide \
 			filter=custom/scripts/fix_io_lef.py \
+		-xschem cells/*/*.sym \
+			filter=custom/scripts/make_primitive.py \
 		-verilog cells/*/*.v compile-only \
 		-library general gf180mcu_fd_io 2>&1 | tee -a ${GF180MCU$*}_make.log
 
diff --git a/gf180mcu/custom/scripts/make_primitive.py b/gf180mcu/custom/scripts/make_primitive.py
new file mode 100755
index 0000000..336238b
--- /dev/null
+++ b/gf180mcu/custom/scripts/make_primitive.py
@@ -0,0 +1,86 @@
+#!/usr/bin/env python3
+#
+# make_primitive.py ---
+#
+# Special-purpose filter script that converts "schematic" to "primitive"
+# in the xschem symbols of PDK elements that are expected to be used as
+# black-box elements in a user schematic, such as I/O cells and standard
+# cells.
+#
+# This script is a filter to be run by setting the name of this script as
+# the value to "filter=" for the model install in the gf180mcu Makefile.
+
+import re
+import os
+import sys
+
+def filter(inname, outname):
+
+    # Read input, which is an xschem .sym symbol file.
+    try:
+        with open(inname, 'r') as inFile:
+            symtext = inFile.read()
+            symlines = symtext.splitlines()
+    except:
+        print('make_primitive.py: failed to open ' + inname + ' for reading.', file=sys.stderr)
+        return 1
+
+    # Process input with regexp
+
+    fixedlines = []
+    modified = False
+
+    for line in symlines:
+        fixedline = line
+        fixedline = re.sub('type=subcircuit', 'type=primitive', fixedline)
+        if line != fixedline:
+            modified = True
+        fixedlines.append(fixedline)
+
+    # Write output
+    if outname == None:
+        for i in fixedlines:
+            print(i)
+    else:
+        # If the output is a symbolic link but no modifications have been made,
+        # then leave it alone.  If it was modified, then remove the symbolic
+        # link before writing.
+        if os.path.islink(outname):
+            if not modified:
+                return 0
+            else:
+                os.unlink(outname)
+        try:
+            with open(outname, 'w') as outFile:
+                for i in fixedlines:
+                    print(i, file=outFile)
+        except:
+            print('make_primitive.py: failed to open ' + outname + ' for writing.', file=sys.stderr)
+            return 1
+
+
+if __name__ == '__main__':
+
+    # This script expects to get one or two arguments.  One argument is
+    # mandatory and is the input file.  The other argument is optional and
+    # is the output file.  The output file and input file may be the same
+    # name, in which case the original input is overwritten.
+
+    options = []
+    arguments = []
+    for item in sys.argv[1:]:
+        if item.find('-', 0) == 0:
+            options.append(item[1:])
+        else:
+            arguments.append(item)
+
+    if len(arguments) > 0:
+        infilename = arguments[0]
+
+    if len(arguments) > 1:
+        outfilename = arguments[1]
+    else:
+        outfilename = None
+
+    result = filter(infilename, outfilename)
+    sys.exit(result)
diff --git a/gf180mcu/gf180mcu.json b/gf180mcu/gf180mcu.json
index 07ac49e..c4000f5 100644
--- a/gf180mcu/gf180mcu.json
+++ b/gf180mcu/gf180mcu.json
@@ -90,16 +90,16 @@
         "magic": "MAGIC_COMMIT"
     },
     "reference": {
-        "open_pdks": "426f95115110d6d0185f1ba3d09b3aa8a014969b",
+        "open_pdks": "a80ed405766c5d4f21c8bfca84552a7478fe75b2",
         "magic": "0022c502c8a406d1d565e4dc2236498093ef1314",
         "gf180mcu_pdk": "a897aa30369d3bcec87d9d50ce9b01f320f854ef",
         "gf180mcu_fd_pr": "faef89e8c1b392733c32820a7b12e3a3847cc18c",
         "gf180mcu_fd_pv": "10ee7fc75437edafa56f29f2b1872e95c9f22b71",
-        "gf180mcu_fd_io": "f84fe10e67a5cb9002e9ae8210f58e570726c366",
+        "gf180mcu_fd_io": "dff0f7f47e406550dcba9b609d3fd3decd3a4367",
         "gf180mcu_fd_sc_mcu7t5v0": "8743b6f9641eb8707179c4e51703380d4dc90f16",
         "gf180mcu_fd_sc_mcu9t5v0": "e0e80f5a6522f10b82165d3aeab9b8ee28e89849",
         "gf180mcu_fd_ip_sram": "9c411928870ce15226228fa52ddb6ecc0ea4ffbe",
-        "gf180mcu_as_sc_mcu7t3v3": "4570a9648972e03a0f1593de0479a0f61f945cc6",
+        "gf180mcu_as_sc_mcu7t3v3": "450f6039f6d7f556b47f74b456c010f424d9cfcd",
         "gf180mcu_osu_sc_gf12t3v3": "aa2fa8cd1bcb8fe98669acd05c0b0c65879268b3",
         "gf180mcu_osu_sc_gf9t3v3": "aa2fa8cd1bcb8fe98669acd05c0b0c65879268b3"
     }
diff --git a/gf180mcu/magic/gf180mcu.tcl b/gf180mcu/magic/gf180mcu.tcl
index c466abc..923cd2c 100644
--- a/gf180mcu/magic/gf180mcu.tcl
+++ b/gf180mcu/magic/gf180mcu.tcl
@@ -3240,15 +3240,23 @@
 		guard 1 glc 1 grc 1 gtc 0 gbc 0 tbcov 100 rlcov 100 \
 		topc 1 botc 1 poverlap 0 doverlap 1 lmin 0.28 wmin 0.22 \
 		class mosfet full_metal 1 \
-		compatible {pfet_03v3 pfet_06v0}}
+		compatible {pfet_03v3 pfet_05v0 pfet_06v0}}
 }
 
-proc gf180mcu::pfet_06v0_defaults {} {
+proc gf180mcu::pfet_05v0_defaults {} {
     return {w 0.3 l 0.5 m 1 nf 1 diffcov 100 polycov 100 \
 		guard 1 glc 1 grc 1 gtc 0 gbc 0 tbcov 100 rlcov 100 \
 		topc 1 botc 1 poverlap 0 doverlap 1 lmin 0.5 wmin 0.3 \
+		lmax 0.595 class mosfet full_metal 1 \
+		compatible {pfet_03v3 pfet_05v0 pfet_06v0}}
+}
+
+proc gf180mcu::pfet_06v0_defaults {} {
+    return {w 0.3 l 0.55 m 1 nf 1 diffcov 100 polycov 100 \
+		guard 1 glc 1 grc 1 gtc 0 gbc 0 tbcov 100 rlcov 100 \
+		topc 1 botc 1 poverlap 0 doverlap 1 lmin 0.55 wmin 0.3 \
 		class mosfet full_metal 1 \
-		compatible {pfet_03v3 pfet_06v0}}
+		compatible {pfet_03v3 pfet_05v0 pfet_06v0}}
 }
 
 proc gf180mcu::pfet_03v3_dss_defaults {} {
@@ -3256,7 +3264,7 @@
 		guard 1 glc 1 grc 1 gtc 0 gbc 0 tbcov 100 rlcov 100 \
 		topc 1 botc 1 poverlap 0 doverlap 1 lmin 0.28 wmin 0.22 \
 		class mosfet full_metal 1 \
-		compatible {pfet_03v3_dss pfet_06v0_dss}}
+		compatible {pfet_03v3_dss pfet_05v0 pfet_06v0_dss}}
 }
 
 proc gf180mcu::pfet_06v0_dss_defaults {} {
@@ -3276,15 +3284,23 @@
 		guard 1 glc 1 grc 1 gtc 0 gbc 0 tbcov 100 rlcov 100 \
 		topc 1 botc 1 poverlap 0 doverlap 1 lmin 0.28 wmin 0.22 \
 		class mosfet full_metal 1 \
-		compatible {nfet_03v3 nfet_06v0 nfet_06v0_nvt}}
+		compatible {nfet_03v3 nfet_05v0 nfet_06v0 nfet_06v0_nvt}}
+}
+
+proc gf180mcu::nfet_05v0_defaults {} {
+    return {w 0.3 l 0.6 m 1 nf 1 diffcov 100 polycov 100 \
+		guard 1 glc 1 grc 1 gtc 0 gbc 0 tbcov 100 rlcov 100 \
+		topc 1 botc 1 poverlap 0 doverlap 1 lmin 0.7 wmin 0.3 \
+		lmax 0.695 class mosfet full_metal 1 \
+		compatible {nfet_03v3 nfet_05v0 nfet_06v0 nfet_06v0_nvt}}
 }
 
 proc gf180mcu::nfet_06v0_defaults {} {
-    return {w 0.3 l 0.6 m 1 nf 1 diffcov 100 polycov 100 \
+    return {w 0.3 l 0.7 m 1 nf 1 diffcov 100 polycov 100 \
 		guard 1 glc 1 grc 1 gtc 0 gbc 0 tbcov 100 rlcov 100 \
 		topc 1 botc 1 poverlap 0 doverlap 1 lmin 0.6 wmin 0.3 \
 		class mosfet full_metal 1 \
-		compatible {nfet_03v3 nfet_06v0 nfet_06v0_nvt}}
+		compatible {nfet_03v3 nfet_05v0 nfet_06v0 nfet_06v0_nvt}}
 }
 
 proc gf180mcu::nfet_06v0_nvt_defaults {} {
@@ -3292,7 +3308,7 @@
 		guard 1 glc 1 grc 1 gtc 0 gbc 0 tbcov 100 rlcov 100 \
 		topc 1 botc 1 poverlap 0 doverlap 1 lmin 1.8 wmin 0.8 \
 		class mosfet full_metal 1 \
-		compatible {nfet_03v3 nfet_06v0 nfet_06v0_nvt}}
+		compatible {nfet_03v3 nfet_05v0 nfet_06v0 nfet_06v0_nvt}}
 }
 
 proc gf180mcu::nfet_10v0_asym_defaults {} {
@@ -3412,6 +3428,10 @@
     return [gf180mcu::mos_convert $parameters]
 }
 
+proc gf180mcu::nfet_05v0_convert {parameters} {
+    return [gf180mcu::mos_convert $parameters]
+}
+
 proc gf180mcu::nfet_06v0_convert {parameters} {
     return [gf180mcu::mos_convert $parameters]
 }
@@ -3424,6 +3444,10 @@
     return [gf180mcu::mos_convert $parameters]
 }
 
+proc gf180mcu::pfet_05v0_convert {parameters} {
+    return [gf180mcu::mos_convert $parameters]
+}
+
 proc gf180mcu::pfet_06v0_convert {parameters} {
     return [gf180mcu::mos_convert $parameters]
 }
@@ -3511,6 +3535,10 @@
     gf180mcu::mos_dialog nfet_03v3 $parameters
 }
 
+proc gf180mcu::nfet_05v0_dialog {parameters} {
+    gf180mcu::mos_dialog nfet_05v0 $parameters
+}
+
 proc gf180mcu::nfet_06v0_dialog {parameters} {
     gf180mcu::mos_dialog nfet_06v0 $parameters
 }
@@ -3523,6 +3551,10 @@
     gf180mcu::mos_dialog pfet_03v3 $parameters
 }
 
+proc gf180mcu::pfet_05v0_dialog {parameters} {
+    gf180mcu::mos_dialog pfet_05v0 $parameters
+}
+
 proc gf180mcu::pfet_06v0_dialog {parameters} {
     gf180mcu::mos_dialog pfet_06v0 $parameters
 }
@@ -4228,6 +4260,30 @@
 }
 
 #-------------------
+# pMOS 5.0V
+#-------------------
+
+proc gf180mcu::pfet_05v0_draw {parameters} {
+    set newdict [dict create \
+	    diff_poly_space	0.30 \
+	    diff_gate_space	0.30 \
+	    diff_spacing	0.36 \
+	    gate_type		mvpfet \
+	    diff_type 		mvpdiff \
+	    diff_contact_type	mvpdc \
+	    plus_diff_type	mvnsd \
+	    plus_contact_type	mvnsc \
+	    poly_type		poly \
+	    poly_contact_type	pc \
+	    sub_surround	0.16 \
+	    dev_surround	0.43 \
+	    sub_type		nwell \
+    ]
+    set drawdict [dict merge $gf180mcu::ruleset $newdict $parameters]
+    return [gf180mcu::mos_draw $drawdict]
+}
+
+#-------------------
 # pMOS 6.0V
 #-------------------
 
@@ -4252,6 +4308,29 @@
 }
 
 #-------------------
+# nMOS 5.0V
+#-------------------
+
+proc gf180mcu::nfet_05v0_draw {parameters} {
+    set newdict [dict create \
+	    diff_poly_space	0.30 \
+	    diff_gate_space	0.30 \
+	    diff_spacing	0.36 \
+	    gate_type		mvnfet \
+	    diff_type 		mvndiff \
+	    diff_contact_type	mvndc \
+	    plus_diff_type	mvpsd \
+	    plus_contact_type	mvpsc \
+	    poly_type		poly \
+	    poly_contact_type	pc \
+	    sub_type		pwell \
+	    sub_surround	0.16 \
+    ]
+    set drawdict [dict merge $gf180mcu::ruleset $newdict $parameters]
+    return [gf180mcu::mos_draw $drawdict]
+}
+
+#-------------------
 # nMOS 6.0V
 #-------------------
 
@@ -4326,7 +4405,7 @@
 }
 
 #-------------------
-# pMOS 6.0V
+# pMOS 6.0V dss
 #-------------------
 
 proc gf180mcu::pfet_06v0_dss_draw {parameters} {
@@ -4471,6 +4550,7 @@
 #----------------------------------------------------------------
 
 proc gf180mcu::mos_check {parameters} {
+    set lmax 0
 
     # Set a local variable for each parameter (e.g., $l, $w, etc.)
     foreach key [dict keys $parameters] {
@@ -4506,6 +4586,11 @@
 	puts stderr "Mos length must be >= $lmin um"
         dict set parameters l $lmin
     } 
+    if {($lmax > 0) && ($l > $lmax)} {
+	puts stderr "MOS length must be <= $lmax"
+	dict set parameters l $lmax
+	set l $lmax
+    } 
     if {$w < $wmin} {
 	puts stderr "Mos width must be >= $wmin um"
         dict set parameters w $wmin
@@ -4580,6 +4665,10 @@
    return [gf180mcu::mos_check $parameters]
 }
 
+proc gf180mcu::nfet_05v0_check {parameters} {
+   return [gf180mcu::mos_check $parameters]
+}
+
 proc gf180mcu::nfet_06v0_check {parameters} {
    return [gf180mcu::mos_check $parameters]
 }
@@ -4592,6 +4681,10 @@
    return [gf180mcu::mos_check $parameters]
 }
 
+proc gf180mcu::pfet_05v0_check {parameters} {
+   return [gf180mcu::mos_check $parameters]
+}
+
 proc gf180mcu::pfet_06v0_check {parameters} {
    return [gf180mcu::mos_check $parameters]
 }
diff --git a/gf180mcu/magic/gf180mcu.tech b/gf180mcu/magic/gf180mcu.tech
index 4cb0ac0..08ac8fa 100644
--- a/gf180mcu/magic/gf180mcu.tech
+++ b/gf180mcu/magic/gf180mcu.tech
@@ -4853,13 +4853,13 @@
  device msubcircuit nfet_03v3 nfet ndiff,ndc ndiff,ndc allpsub error \
 	l=l w=w a1=as p1=ps a2=ad p2=pd
  device msubcircuit pfet_06v0 mvpfet mvpdiff,mvpdc mvpdiff,mvpdc allnwell error \
-	l>=5.5e-7 l=l w=w a1=as p1=ps a2=ad p2=pd
+	l>=0.55 l=l w=w a1=as p1=ps a2=ad p2=pd
  device msubcircuit pfet_05v0 mvpfet mvpdiff,mvpdc mvpdiff,mvpdc allnwell error \
-	l<5.5e-7 l=l w=w a1=as p1=ps a2=ad p2=pd
+	l<0.55 l=l w=w a1=as p1=ps a2=ad p2=pd
  device msubcircuit nfet_06v0 mvnfet mvndiff,mvndc mvndiff,mvndc allpsub error \
-	l>=7e-7 l=l w=w a1=as p1=ps a2=ad p2=pd
+	l>=0.7 l=l w=w a1=as p1=ps a2=ad p2=pd
  device msubcircuit nfet_05v0 mvnfet mvndiff,mvndc mvndiff,mvndc allpsub error \
-	l<7e-7 l=l w=w a1=as p1=ps a2=ad p2=pd
+	l<0.7 l=l w=w a1=as p1=ps a2=ad p2=pd
  device msubcircuit pfet_03v3_dss pfet pdiffres pdiffres allnwell error \
 	l=l w=w a1=as p1=ps a2=ad p2=pd l1=s_sab l2=d_sab
  device msubcircuit nfet_03v3_dss nfet ndiffres ndiffres allpsub error \
diff --git a/sky130/sky130.json b/sky130/sky130.json
index 56a5bca..d73000b 100644
--- a/sky130/sky130.json
+++ b/sky130/sky130.json
@@ -94,7 +94,7 @@
         "magic": "MAGIC_COMMIT"
     },
     "reference": {
-        "open_pdks": "426f95115110d6d0185f1ba3d09b3aa8a014969b",
+        "open_pdks": "a80ed405766c5d4f21c8bfca84552a7478fe75b2",
         "magic": "0022c502c8a406d1d565e4dc2236498093ef1314",
         "sky130_fd_pr": "1232782c1b9fab3aacda74d67ce7c92bf7da8105",
         "sky130_fd_io": "e60737bf624df95c211fe99c007ddec78e3e081d",