fix(tt_um_tnt_diff_rx): skip

Causes DRC errors when hardening tt_top (due to a bug in the power strip generator that is triggered by a power strip < 1.42 us)

.vscode/settings.json

@@ -0,0 +1,9 @@
+{
+  "python.analysis.inlayHints.functionReturnTypes": true,
+  "python.analysis.inlayHints.variableTypes": true,
+  "python.analysis.typeCheckingMode": "strict",
+  "[python]": {
+    "editor.defaultFormatter": "ms-python.black-formatter"
+  },
+  "python.formatting.provider": "none"
+}

beol.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+klayout -b -r ~/openmpw/mpw_precheck/checks/tech-files/sky130A_mr.drc -rd beol=true -rd input=projects/$1/$1.gds -rd topcell=$1 -rd report=drc_beol.xml
+code projects/$1/drc_beol.xml

default.cvcrc

@@ -0,0 +1,36 @@
+CVC_TOP = ''
+CVC_NETLIST = ''
+CVC_MODE = ''
+CVC_MODEL_FILE = ''
+CVC_POWER_FILE = ''
+CVC_FUSE_FILE = ''
+CVC_REPORT_FILE = ''
+CVC_REPORT_TITLE = ''
+CVC_CIRCUIT_ERROR_LIMIT = '100'
+CVC_SEARCH_LIMIT = '100'
+CVC_LEAK_LIMIT = '0.0002'
+CVC_SOI = 'false'
+CVC_SCRC = 'false'
+CVC_VTH_GATES = 'false'
+CVC_MIN_VTH_GATES = 'false'
+CVC_IGNORE_VTH_FLOATING = 'false'
+CVC_IGNORE_NO_LEAK_FLOATING = 'false'
+CVC_LEAK_OVERVOLTAGE = 'true'
+CVC_LOGIC_DIODES = 'false'
+CVC_ANALOG_GATES = 'true'
+CVC_BACKUP_RESULTS = 'false'
+CVC_MOS_DIODE_ERROR_THRESHOLD = '0'
+CVC_SHORT_ERROR_THRESHOLD = '0'
+CVC_BIAS_ERROR_THRESHOLD = '0'
+CVC_FORWARD_ERROR_THRESHOLD = '0'
+CVC_FLOATING_ERROR_THRESHOLD = '0'
+CVC_GATE_ERROR_THRESHOLD = '0'
+CVC_LEAK?_ERROR_THRESHOLD = '0'
+CVC_EXPECTED_ERROR_THRESHOLD = '0'
+CVC_OVERVOLTAGE_ERROR_THRESHOLD = '0'
+CVC_PARALLEL_CIRCUIT_PORT_LIMIT = '0'
+CVC_CELL_ERROR_LIMIT_FILE = ''
+CVC_CELL_CHECKSUM_FILE = ''
+CVC_LARGE_CIRCUIT_SIZE = '10000000'
+CVC_NET_CHECK_FILE = ''
+CVC_MODEL_CHECK_FILE = ''

feol.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+klayout -b -r ~/openmpw/mpw_precheck/checks/tech-files/sky130A_mr.drc -rd feol=true -rd input=projects/$1/$1.gds -rd topcell=$1 -rd report=drc_feol.xml
+code projects/$1/drc_feol.xml

feol_re.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+klayout -b -r ~/openmpw/mpw_precheck/checks/tech-files/sky130A_mr.drc -rd feol=true -rd input=reharden/$1/runs/wokwi/results/final/gds/$1.gds -rd topcell=$1 -rd report=drc_feol.xml
+code reharden/$1/runs/wokwi/results/final/gds/drc_feol.xml
+#klayout reharden/$1/runs/wokwi/results/final/gds/$1.gds

fom_density.drc

@@ -0,0 +1,162 @@
+
+errs = 0
+log("fom_density.drc:: sourcing design file=#{$gds_input} topcell=#{$top_cell} ...")
+src = source($gds_input, $top_cell)
+layout = src.layout
+log("done.")
+
+
+report("Density Checks", $report_file)
+
+verbose(false)
+
+diff_wildcard = "65/20"
+tap_wildcard = "65/44"
+fomfill_wildcard = "65,23/28"
+fommk_wildcard = "23/0"
+
+#$chip_boundary = input(235,4)
+log("flattening chip boundary...")
+$chip_boundary = input(235,4).flatten
+log("done.")
+
+$bbox = $chip_boundary.bbox
+
+window_size = 700
+
+if $step
+    step_size = $step.to_f
+else
+    step_size = 70
+end
+log("step size = #{step_size}")
+
+llx, lly, urx, ury = $bbox.left, $bbox.bottom, $bbox.right, $bbox.top
+log("llx=#{llx} lly=#{lly} urx=#{urx} ury=#{ury}")
+if urx-llx <= 0 || ury-lly <= 0
+   STDERR.puts "ERROR: fom_density.drc: fatal error, chip_boundary bbox empty or malformed"
+   errs += 1
+end
+
+cnt = 0
+x_cnt = ((urx-step_size-llx) / step_size).ceil()
+y_cnt = ((ury-step_size-lly) / step_size ).ceil()
+tot = x_cnt * y_cnt
+$fom_area_map = array = Array.new(x_cnt+1) { Array.new(y_cnt+1) { 0.0 } }
+$tile_area_map = array = Array.new(x_cnt+1) { Array.new(y_cnt+1) { 0.0 } }
+
+log("x_cnt = #{x_cnt}")
+log("y_cnt = #{y_cnt}")
+
+if x_cnt < 1 || y_cnt < 1
+  STDERR.puts "ERROR: fom_density.drc: fatal error, x-count or y-count < 1: #{x_cnt} #{y_cnt}"
+  errs += 1
+end
+
+# any errors till now?: abort.
+if errs > 0
+  exit 1
+end
+
+class FomArea < RBA::TileOutputReceiver
+  def put(ix, iy, tile, obj, dbu, clip)
+    if tile
+        fom_area_scaled = obj.to_f * dbu * dbu
+        #tile_area_scaled = tile.area * dbu * dbu
+        tile_area_scaled = (tile & ($bbox * (1.0 / dbu))).area * dbu * dbu
+        #puts "got area for tile #{ix+1},#{iy+1}: #{fom_area_scaled.to_s} #{tile_area_scaled.to_s}"
+        $fom_area_map[ix][iy] += fom_area_scaled
+        $tile_area_map[ix][iy] = tile_area_scaled
+    else
+        puts "empty tile #{ix+1},#{iy+1}"
+    end
+  end
+  def finish(success)
+    puts "finish received: success = #{success}"
+  end
+
+end
+
+tp = RBA::TilingProcessor::new
+
+# register the custom receiver
+tp.output("my_receiver", FomArea::new)
+
+tp.input("diff", layout.top_cell().begin_shapes_rec(layout.layer(65,20) ) )
+tp.input("tap", layout.top_cell().begin_shapes_rec(layout.layer(65,44) ) )
+tp.input("fomfill", layout.top_cell().begin_shapes_rec(layout.layer(23,28) ) )
+
+tp.frame=$bbox
+tp.tile_size(step_size, step_size)  # 70x70 um tile size
+log("dbu = #{layout.dbu}")
+log("bbox_area = #{$bbox.area}")
+tp.dbu = layout.dbu
+tp.threads = $thr.to_i
+# tp.scale_to_dbu = false
+
+# The script clips the input at the tile and computes the (merged) area:
+tp.queue("_output(my_receiver, _tile && ((diff | tap | fomfill) & _tile).area)")
+
+log("calculating subtile areas (= #{tot})...")
+tp.execute("Job description")
+
+cnt = 0
+big_x_cnt = ((urx-window_size-llx) / step_size).ceil()
+big_y_cnt = ((ury-window_size-lly) / step_size).ceil()
+big_tot = big_x_cnt * big_y_cnt
+tiles_per_step = (window_size / step_size).ceil()
+log("tiles per step = #{tiles_per_step}")
+log("calculating window step densities (= #{big_tot})...")
+markers_min = polygon_layer
+markers_max = polygon_layer
+min_err = 0
+max_err = 0
+min_density = 1
+max_density = 0
+for x in (0 ... big_x_cnt)
+    log("{{ CHECK }} #{cnt}/#{big_tot.round}")
+    for y in (0 ... big_y_cnt)
+        fom_area = 0
+        tile_area = 0
+        fom_density = 0
+        #$fom_area_map.slice(x, tiles_per_step).each { |a| a.slice(y, tiles_per_step).each { |b| puts "#{x},#{y} = #{b}" } }
+        $fom_area_map.slice(x, tiles_per_step).each { |a| a.slice(y, tiles_per_step).each { |b| fom_area+=b } }
+        $tile_area_map.slice(x, tiles_per_step).each { |a| a.slice(y, tiles_per_step).each { |b| tile_area+=b } }
+        marker_box = box(x * step_size, y* step_size, (x+tiles_per_step)*step_size, (y+tiles_per_step)*step_size)
+        if tile_area > 0
+            fom_density = fom_area / tile_area
+            #log("fom density  #{cnt}/#{big_tot.round} is #{fom_density} for area #{tile_area}")
+            if fom_density < min_density
+                min_density = fom_density
+            end
+            if fom_density > max_density
+                max_density = fom_density
+            end
+            if fom_density < 0.33
+                min_err += 1
+                markers_min.insert(marker_box)
+                log("fom density below 0.33 : #{cnt}/#{big_tot.round} is #{"%.4f" % fom_density} for tile (#{marker_box.to_s}), area = #{tile_area.round}")
+            elsif fom_density > 0.57
+                max_err += 1
+                markers_max.insert(marker_box)
+                log("fom density above 0.57 : #{cnt}/#{big_tot.round} is #{"%.4f" % fom_density} for tile (#{marker_box.to_s}), area = #{tile_area.round}")
+            end
+        end
+        cnt += 1
+    end
+end
+
+log("minimum fom density  = #{"%.4f" % min_density}")
+log("maximum fom density  = #{"%.4f" % max_density}")
+
+if min_err > 0
+    log("cfom.pd.1d violations = #{min_err}")
+    markers_min.output("cfom.pd.1d", "0.33 min fom pattern density")
+end
+
+if max_err > 0
+    log("cfom.pd.1e violations = #{max_err}")
+    markers_max.output("cfom.pd.1e", "0.57 max fom pattern density")
+end
+
+