diff --git a/sky130/klayout/sky130A_mr.drc b/sky130/klayout/sky130A_mr.drc
index 4f5b4e9..ca2965e 100755
--- a/sky130/klayout/sky130A_mr.drc
+++ b/sky130/klayout/sky130A_mr.drc
@@ -5,7 +5,7 @@
 #   Distributed under GNU GPLv3: https://www.gnu.org/licenses/
 #
 #  History :
-#   2020-10-04 : v1.0 : initial release
+#   2022-1-13 : 2022.1.13_01.03 release
 #
 ##########################################################################################
 
@@ -222,6 +222,8 @@
 log("START: 64/20 (nwell)")
 nwell.width(0.84, euclidian).output("nwell.1", "nwell.1 : min. nwell width : 0.84um")
 nwell.space(1.27, euclidian).output("nwell.2a", "nwell.2a : min. nwell spacing (merged if less) : 1.27um")
+nwell_interact = nwell.merge
+dnwell.enclosing(nwell_interact.holes, 1.03, euclidian).output("nwell.6", "nwell.6 : min enclosure of nwellHole by dnwell : 1.03um")
 log("END: 64/20 (nwell)")
 
 #   hvtp
@@ -299,18 +301,17 @@
 
 #   nsdm
 log("START: 93/44 (nsdm)")
-nsdm.width(0.38, euclidian).output("nsd.1", "nsd.1 : min. nsdm width : 0.38um")
-nsdm.space(0.38, euclidian).output("nsd.2", "nsd.2 : min. nsdm spacing, should be manually merged if less than : 0.38um")
+nsdm.outside(areaid_ce).width(0.38, euclidian).output("nsd.1", "nsd.1 : min. nsdm width : 0.38um")
+nsdm.not(areaid_ce).space(0.38, euclidian).output("nsd.2", "nsd.2 : min. nsdm spacing, should be manually merged if less than : 0.38um")
 log("END: 93/44 (nsdm)")
 
 #   psdm
 log("START: 94/20 (psdm)")
-psdm.width(0.38, euclidian).output("psd.1", "psd.1 : min. psdm width : 0.38um")
-psdm.space(0.38, euclidian).output("psd.2", "psd.2 : min. psdm spacing, should be manually merged if less than : 0.38um")
+psdm.outside(areaid_ce).width(0.38, euclidian).output("psd.1", "psd.1 : min. psdm width : 0.38um")
+psdm.not(areaid_ce).space(0.38, euclidian).output("psd.2", "psd.2 : min. psdm spacing, should be manually merged if less than : 0.38um")
 log("END: 94/20 (psdm)")
 
 #   licon
-#   licon
 log("START: 66/44 (licon)")
 if SEAL
   ringLICON = licon.drc(with_holes > 0)
diff --git a/sky130/klayout/sky130A_non-mr.drc b/sky130/klayout/sky130A_non-mr.drc
new file mode 100644
index 0000000..0a0bc78
--- /dev/null
+++ b/sky130/klayout/sky130A_non-mr.drc
@@ -0,0 +1,222 @@
+#  DRC  for  SKY130 according to :
+#   https://skywater-pdk.readthedocs.io/en/latest/rules/periphery.html
+#   https://skywater-pdk.readthedocs.io/en/latest/rules/layers.html
+#
+#   Distributed under GNU GPLv3: https://www.gnu.org/licenses/
+#
+#  History :
+#   2022-01-13 : 2022.1.13_01.01 initial release
+#
+##########################################################################################
+
+# optionnal for a batch launch :   klayout -b -rd input=my_layout.gds -rd report=sky130_drc.txt -r drc_sky130.drc
+if $input
+  source($input, $top_cell)
+end
+
+if $report
+  report("SKY130 DRC runset", $report)
+else
+  report("SKY130 DRC runset", File.join(File.dirname(RBA::CellView::active.filename), "sky130_drc.txt"))
+end
+
+AL = true  # do not change
+CU = false  # do not change
+# choose betwen only one of  AL  or  CU  back-end flow here :
+backend_flow = AL
+
+# enable / disable rule groups
+if $feol  == "1"        || $feol == "true"
+  FEOL         = true # front-end-of-line checks
+else
+  FEOL         = false
+end
+
+if $beol == "1"         || $beol == "true"
+  BEOL         = true # back-end-of-line checks
+else
+  BEOL         = false
+end
+
+if $offgrid == "1"      || $offgrid == "true"
+  OFFGRID      = true # manufacturing grid/angle checks
+else
+  OFFGRID      = false
+end
+
+if $seal  == "1"        || $seal == "true"
+  SEAL         = true # SEAL RING checks
+else
+  SEAL         = false
+end
+
+if $floating_met == "1" || $floating_met == "true"
+  FLOATING_MET = true # back-end-of-line checks
+else
+  FLOATING_MET = false
+end
+
+# klayout setup
+########################
+# use a tile size of 1mm - not used in deep mode-
+# tiles(1000.um)
+# use a tile border of 10 micron:
+# tile_borders(1.um)
+#no_borders
+
+# hierachical
+deep
+
+if $thr
+    threads($thr)
+else
+    threads(4)
+end
+
+# if more inof is needed, set true
+# verbose(true)
+verbose(true)
+
+# layers definitions
+########################
+
+# all except purpose (datatype) 5 -- label and 44 -- via
+li_wildcard = "67/20"
+mcon_wildcard = "67/44"
+
+m1_wildcard = "68/20"
+via_wildcard = "68/44"
+
+m2_wildcard = "69/20"
+via2_wildcard = "69/44"
+
+m3_wildcard = "70/20"
+via3_wildcard = "70/44"
+
+m4_wildcard = "71/20"
+via4_wildcard = "71/44"
+
+m5_wildcard = "72/20"
+
+diff = input(65, 20)
+tap = polygons(65, 44)
+nwell = polygons(64, 20)
+dnwell = polygons(64, 18)
+pwbm = polygons(19, 44)
+pwde = polygons(124, 20)
+natfet = polygons(124, 21)
+hvtr = polygons(18, 20)
+hvtp = polygons(78, 44)
+ldntm = polygons(11, 44)
+hvi = polygons(75, 20)
+tunm = polygons(80, 20)
+lvtn = polygons(125, 44)
+poly = polygons(66, 20)
+hvntm = polygons(125, 20)
+nsdm = polygons(93, 44)
+psdm = polygons(94, 20)
+rpm = polygons(86, 20)
+urpm = polygons(79, 20)
+npc = polygons(95, 20)
+licon = polygons(66, 44)
+
+li = polygons(li_wildcard)
+mcon = polygons(mcon_wildcard)
+
+m1 = polygons(m1_wildcard)
+via = polygons(via_wildcard)
+
+m2 = polygons(m2_wildcard)
+via2 = polygons(via2_wildcard)
+
+m3 = polygons(m3_wildcard)
+via3 = polygons(via3_wildcard)
+
+m4 = polygons(m4_wildcard)
+via4 = polygons(via4_wildcard)
+
+m5 = polygons(m5_wildcard)
+
+pad = polygons(76, 20)
+nsm = polygons(61, 20)
+capm = polygons(89, 44)
+cap2m = polygons(97, 44)
+vhvi = polygons(74, 21)
+uhvi = polygons(74, 22)
+npn = polygons(82, 20)
+inductor = polygons(82, 24)
+vpp = polygons(82, 64)
+pnp = polygons(82, 44)
+lvs_prune = polygons(84, 44)
+ncm = polygons(92, 44)
+padcenter = polygons(81, 20)
+mf = polygons(76, 44)
+areaid_sl = polygons(81, 1)
+areaid_ce = polygons(81, 2)
+areaid_fe = polygons(81, 3)
+areaid_sc = polygons(81, 4)
+areaid_sf = polygons(81, 6)
+areaid_sw = polygons(81, 7)
+areaid_sr = polygons(81, 8)
+areaid_mt = polygons(81, 10)
+areaid_dt = polygons(81, 11)
+areaid_ft = polygons(81, 12)
+areaid_ww = polygons(81, 13)
+areaid_ld = polygons(81, 14)
+areaid_ns = polygons(81, 15)
+areaid_ij = polygons(81, 17)
+areaid_zr = polygons(81, 18)
+areaid_ed = polygons(81, 19)
+areaid_de = polygons(81, 23)
+areaid_rd = polygons(81, 24)
+areaid_dn = polygons(81, 50)
+areaid_cr = polygons(81, 51)
+areaid_cd = polygons(81, 52)
+areaid_st = polygons(81, 53)
+areaid_op = polygons(81, 54)
+areaid_en = polygons(81, 57)
+areaid_en20 = polygons(81, 58)
+areaid_le = polygons(81, 60)
+areaid_hl = polygons(81, 63)
+areaid_sd = polygons(81, 70)
+areaid_po = polygons(81, 81)
+areaid_it = polygons(81, 84)
+areaid_et = polygons(81, 101)
+areaid_lvt = polygons(81, 108)
+areaid_re = polygons(81, 125)
+areaid_ag = polygons(81, 79)
+poly_rs = polygons(66, 13)
+diff_rs = polygons(65, 13)
+pwell_rs = polygons(64, 13)
+li_rs = polygons(67, 13)
+cfom = polygons(22, 20)
+
+
+# Define a new custom function that selects polygons by their number of holes:
+# It will return a new layer containing those polygons with min to max holes.
+# max can be nil to omit the upper limit.
+class DRC::DRCLayer
+  def with_holes(min, max)
+    new_data = RBA::Region::new
+    self.data.each do |p|
+      if p.holes >= (min || 0) && (!max || p.holes <= max)
+        new_data.insert(p)
+      end
+    end
+    DRC::DRCLayer::new(@engine, new_data)
+  end
+end
+
+# DRC section
+########################
+log("DRC section")
+
+if FEOL
+log("FEOL section")
+
+#   nsdm
+log("START: 93/44 (nsdm)")
+nsdm.and(psdm).output("nsd.1", "nsd.1 : nsdm should not overlap psdm")
+log("END: 93/44 (nsdm)")
+
+end #FEOL