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gf180: add metal density fill rules (fill.json) on the dummy datatype
The gf180 platform had no metal density fill: it shipped FILL_CELLS (std-cell filler) but no FILL_CONFIG, so OpenROAD's density_fill step inserted nothing. gf180mcu's density deck enforces ">30% metal coverage per layer, die-wide" (rules M2.4 / M3.4 / M5.4 / MT.3), which a sparse design cannot meet without metal fill. Add flow/platforms/gf180/fill.json (Metal1-Metal5) and point FILL_CONFIG at it. Two details matter for gf180mcu correctness: - Fill is emitted as rectangular STRIPES (2.0um in the constrained axis, extended along each layer's routing channel), not squares. Square 2.0um tiles waste a gap on all four sides and top out ~18% coverage, leaving Metal5 below the 30% floor; stripes only pay the gap at channel ends and reach ~30-60%. Geometry follows DRM section 13.3 dummy rules: min dimension 2.0um (DM.1), fill-to-fill 1.0um (DM.2, >=0.98), fill-to- circuit-metal 2.0um (DM.3). In the default 5LM_1TM stack Metal5 is the thick top metal (MT.4 min area 0.5625um^2); 2.0um stripes give >=4um^2. - Density fill streams to the foundry dummy-metal datatype 4 (the Metal*_Dummy layers), not datatype 0. The edi2gds layermaps mapped Metal1..Metal5 FILL/FILLOPC to datatype 0, which merges dummy fill with drawn circuit metal. Because fill is spaced 2.0um away from real metal, each shape is an electrically floating island; on the drawn datatype LVS extraction would flag it as metal on no net. Routing FILL/FILLOPC to datatype 4 keeps the fill distinguishable and LVS-clean. Opt-in and no change to existing results: USE_FILL still defaults to 0, so density_fill stays a no-op unless a chip/top-level design sets USE_FILL=1. Block/macro builds keep USE_FILL=0 so fill is inserted once, die-wide, at chip level rather than per block. Verified with OpenROAD density_fill -rules on a routed gf180mcu design: rules parse and stripe fill inserts on Metal1-Metal5 with no errors; per- layer fill-only coverage 24-29% (plus drawn routing) clears the 30% floor. Known limitation: in the 6LM_1TM stack Metal5 is a thin intermediate layer and MetalTop (GDS 53) is the thick top; this fill.json fills Metal1-5 only, so 6LM MetalTop is not yet filled. Signed-off-by: Serge Rabyking <s.rabykin@gmail.com>
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Lines changed: 122 additions & 40 deletions

‎flow/platforms/gf180/config.mk‎

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@@ -32,6 +32,10 @@ export FILL_CELLS ?= gf180mcu_fd_sc_mcu$(TRACK_OPTIO
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gf180mcu_fd_sc_mcu$(TRACK_OPTION)$(POWER_OPTION)__fill_2 \
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gf180mcu_fd_sc_mcu$(TRACK_OPTION)$(POWER_OPTION)__fill_1
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# Metal density fill rules (OpenROAD density_fill). Applied at chip level
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# only when USE_FILL=1; macro/block builds leave USE_FILL=0 (the default).
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export FILL_CONFIG ?= $(PLATFORM_DIR)/fill.json
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export TIE_CELL = gf180mcu_fd_sc_mcu$(TRACK_OPTION)$(POWER_OPTION)__filltie
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export ENDCAP_CELL = gf180mcu_fd_sc_mcu$(TRACK_OPTION)$(POWER_OPTION)__endcap
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export RC_FILE = $(PLATFORM_DIR)/setRC.tcl

‎flow/platforms/gf180/fill.json‎

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{
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"layers" : {
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"Metal1" : {
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"layer": 34,
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"name": "Metal1",
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"dir": "H",
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"datatype": 0,
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"space_to_outline": 5,
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"non-opc": {
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"datatype": 4,
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"width": [12.00, 6.00, 3.00, 2.00],
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"height": [2.00, 2.00, 2.00, 2.00],
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"space_to_fill": 1.0,
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"space_to_non_fill": 2.0
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}
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},
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"Metal2" : {
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"layer": 36,
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"name": "Metal2",
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"dir": "V",
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"datatype": 0,
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"space_to_outline": 5,
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"non-opc": {
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"datatype": 4,
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"width": [2.00, 2.00, 2.00, 2.00],
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"height": [12.00, 6.00, 3.00, 2.00],
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"space_to_fill": 1.0,
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"space_to_non_fill": 2.0
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}
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},
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"Metal3" : {
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"layer": 42,
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"name": "Metal3",
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"dir": "H",
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"datatype": 0,
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"space_to_outline": 5,
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"non-opc": {
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"datatype": 4,
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"width": [12.00, 6.00, 3.00, 2.00],
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"height": [2.00, 2.00, 2.00, 2.00],
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"space_to_fill": 1.0,
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"space_to_non_fill": 2.0
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}
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},
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"Metal4" : {
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"layer": 46,
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"name": "Metal4",
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"dir": "V",
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"datatype": 0,
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"space_to_outline": 5,
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"non-opc": {
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"datatype": 4,
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"width": [2.00, 2.00, 2.00, 2.00],
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"height": [12.00, 6.00, 3.00, 2.00],
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"space_to_fill": 1.0,
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"space_to_non_fill": 2.0
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}
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},
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"Metal5" : {
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"layer": 81,
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"name": "Metal5",
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"dir": "H",
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"datatype": 0,
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"space_to_outline": 5,
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"non-opc": {
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"datatype": 4,
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"width": [12.00, 6.00, 3.00, 2.00],
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"height": [2.00, 2.00, 2.00, 2.00],
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"space_to_fill": 1.0,
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"space_to_non_fill": 2.0
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}
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}
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}
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}

‎flow/platforms/gf180/gds/7t/gf180mcu_5LM_1TM_9K_7t_edi2gds.layermap‎

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@@ -6,8 +6,8 @@ Metal1 NET 34 0
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Metal1 SPNET 34 0
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Metal1 PIN 34 0
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Metal1 LEFPIN 34 0
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Metal1 FILL 34 0
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Metal1 FILLOPC 34 0
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Metal1 FILL 34 4
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Metal1 FILLOPC 34 4
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Metal1 VIA 34 0
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Metal1 VIAFILL 34 0
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Metal1 VIAFILLOPC 34 0
@@ -31,8 +31,8 @@ Metal2 NET 36 0
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Metal2 SPNET 36 0
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Metal2 PIN 36 0
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Metal2 LEFPIN 36 0
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Metal2 FILL 36 0
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Metal2 FILLOPC 36 0
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Metal2 FILL 36 4
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Metal2 FILLOPC 36 4
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Metal2 VIA 36 0
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Metal2 VIAFILL 36 0
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Metal2 VIAFILLOPC 36 0
@@ -56,8 +56,8 @@ Metal3 NET 42 0
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Metal3 SPNET 42 0
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Metal3 PIN 42 0
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Metal3 LEFPIN 42 0
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Metal3 FILL 42 0
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Metal3 FILLOPC 42 0
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Metal3 FILL 42 4
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Metal3 FILLOPC 42 4
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Metal3 VIA 42 0
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Metal3 VIAFILL 42 0
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Metal3 VIAFILLOPC 42 0
@@ -81,8 +81,8 @@ Metal4 NET 46 0
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Metal4 SPNET 46 0
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Metal4 PIN 46 0
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Metal4 LEFPIN 46 0
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Metal4 FILL 46 0
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Metal4 FILLOPC 46 0
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Metal4 FILL 46 4
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Metal4 FILLOPC 46 4
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Metal4 VIA 46 0
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Metal4 VIAFILL 46 0
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Metal4 VIAFILLOPC 46 0
@@ -106,8 +106,8 @@ Metal5 NET 81 0
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Metal5 SPNET 81 0
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Metal5 PIN 81 0
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Metal5 LEFPIN 81 0
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Metal5 FILL 81 0
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Metal5 FILLOPC 81 0
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Metal5 FILL 81 4
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Metal5 FILLOPC 81 4
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Metal5 VIA 81 0
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Metal5 VIAFILL 81 0
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Metal5 VIAFILLOPC 81 0

‎flow/platforms/gf180/gds/7t/gf180mcu_6LM_1TM_9K_7t_edi2gds.layermap‎

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@@ -6,8 +6,8 @@ Metal1 NET 34 0
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Metal1 SPNET 34 0
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Metal1 PIN 34 0
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Metal1 LEFPIN 34 0
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Metal1 FILL 34 0
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Metal1 FILLOPC 34 0
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Metal1 FILL 34 4
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Metal1 FILLOPC 34 4
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Metal1 VIA 34 0
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Metal1 VIAFILL 34 0
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Metal1 VIAFILLOPC 34 0
@@ -31,8 +31,8 @@ Metal2 NET 36 0
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Metal2 SPNET 36 0
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Metal2 PIN 36 0
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Metal2 LEFPIN 36 0
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Metal2 FILL 36 0
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Metal2 FILLOPC 36 0
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Metal2 FILL 36 4
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Metal2 FILLOPC 36 4
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Metal2 VIA 36 0
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Metal2 VIAFILL 36 0
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Metal2 VIAFILLOPC 36 0
@@ -56,8 +56,8 @@ Metal3 NET 42 0
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Metal3 SPNET 42 0
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Metal3 PIN 42 0
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Metal3 LEFPIN 42 0
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Metal3 FILL 42 0
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Metal3 FILLOPC 42 0
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Metal3 FILL 42 4
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Metal3 FILLOPC 42 4
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Metal3 VIA 42 0
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Metal3 VIAFILL 42 0
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Metal3 VIAFILLOPC 42 0
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Metal4 SPNET 46 0
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Metal4 PIN 46 0
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Metal4 LEFPIN 46 0
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Metal4 FILL 46 0
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Metal4 FILLOPC 46 0
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Metal4 FILL 46 4
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Metal4 FILLOPC 46 4
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Metal4 VIA 46 0
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Metal4 VIAFILL 46 0
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Metal4 VIAFILLOPC 46 0
@@ -106,8 +106,8 @@ Metal5 NET 81 0
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Metal5 SPNET 81 0
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Metal5 PIN 81 0
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Metal5 LEFPIN 81 0
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Metal5 FILL 81 0
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Metal5 FILLOPC 81 0
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Metal5 FILL 81 4
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Metal5 FILLOPC 81 4
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Metal5 VIA 81 0
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Metal5 VIAFILL 81 0
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Metal5 VIAFILLOPC 81 0

‎flow/platforms/gf180/gds/9t/gf180mcu_5LM_1TM_9K_9t_edi2gds.layermap‎

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@@ -6,8 +6,8 @@ Metal1 NET 34 0
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Metal1 SPNET 34 0
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Metal1 PIN 34 0
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Metal1 LEFPIN 34 0
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Metal1 FILL 34 0
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Metal1 FILLOPC 34 0
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Metal1 FILL 34 4
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Metal1 FILLOPC 34 4
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Metal1 VIA 34 0
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Metal1 VIAFILL 34 0
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Metal1 VIAFILLOPC 34 0
@@ -31,8 +31,8 @@ Metal2 NET 36 0
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Metal2 SPNET 36 0
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Metal2 PIN 36 0
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Metal2 LEFPIN 36 0
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Metal2 FILL 36 0
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Metal2 FILLOPC 36 0
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Metal2 FILL 36 4
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Metal2 FILLOPC 36 4
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Metal2 VIA 36 0
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Metal2 VIAFILL 36 0
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Metal2 VIAFILLOPC 36 0
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Metal3 SPNET 42 0
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Metal3 PIN 42 0
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Metal3 LEFPIN 42 0
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Metal3 FILL 42 0
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Metal3 FILLOPC 42 0
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Metal3 FILL 42 4
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Metal3 FILLOPC 42 4
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Metal3 VIA 42 0
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Metal3 VIAFILL 42 0
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Metal3 VIAFILLOPC 42 0
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Metal4 SPNET 46 0
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Metal4 PIN 46 0
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Metal4 LEFPIN 46 0
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Metal4 FILL 46 0
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Metal4 FILLOPC 46 0
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Metal4 FILL 46 4
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Metal4 FILLOPC 46 4
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Metal4 VIA 46 0
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Metal4 VIAFILL 46 0
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Metal4 VIAFILLOPC 46 0
@@ -106,8 +106,8 @@ Metal5 NET 81 0
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Metal5 SPNET 81 0
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Metal5 PIN 81 0
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Metal5 LEFPIN 81 0
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Metal5 FILL 81 0
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Metal5 FILLOPC 81 0
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Metal5 FILL 81 4
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Metal5 FILLOPC 81 4
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Metal5 VIA 81 0
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Metal5 VIAFILL 81 0
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Metal5 VIAFILLOPC 81 0

‎flow/platforms/gf180/gds/9t/gf180mcu_6LM_1TM_9K_9t_edi2gds.layermap‎

Lines changed: 10 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -6,8 +6,8 @@ Metal1 NET 34 0
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Metal1 SPNET 34 0
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Metal1 PIN 34 0
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Metal1 LEFPIN 34 0
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Metal1 FILL 34 0
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Metal1 FILLOPC 34 0
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Metal1 FILL 34 4
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Metal1 FILLOPC 34 4
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Metal1 VIA 34 0
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Metal1 VIAFILL 34 0
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Metal1 VIAFILLOPC 34 0
@@ -31,8 +31,8 @@ Metal2 NET 36 0
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Metal2 SPNET 36 0
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Metal2 PIN 36 0
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Metal2 LEFPIN 36 0
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Metal2 FILL 36 0
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Metal2 FILLOPC 36 0
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Metal2 FILL 36 4
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Metal2 FILLOPC 36 4
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Metal2 VIA 36 0
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Metal2 VIAFILL 36 0
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Metal2 VIAFILLOPC 36 0
@@ -56,8 +56,8 @@ Metal3 NET 42 0
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Metal3 SPNET 42 0
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Metal3 PIN 42 0
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Metal3 LEFPIN 42 0
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Metal3 FILL 42 0
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Metal3 FILLOPC 42 0
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Metal3 FILL 42 4
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Metal3 FILLOPC 42 4
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Metal3 VIA 42 0
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Metal3 VIAFILL 42 0
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Metal3 VIAFILLOPC 42 0
@@ -81,8 +81,8 @@ Metal4 NET 46 0
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Metal4 SPNET 46 0
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Metal4 PIN 46 0
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Metal4 LEFPIN 46 0
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Metal4 FILL 46 0
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Metal4 FILLOPC 46 0
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Metal4 FILL 46 4
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Metal4 FILLOPC 46 4
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Metal4 VIA 46 0
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Metal4 VIAFILL 46 0
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Metal4 VIAFILLOPC 46 0
@@ -106,8 +106,8 @@ Metal5 NET 81 0
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Metal5 SPNET 81 0
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Metal5 PIN 81 0
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Metal5 LEFPIN 81 0
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Metal5 FILL 81 0
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Metal5 FILLOPC 81 0
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Metal5 FILL 81 4
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Metal5 FILLOPC 81 4
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Metal5 VIA 81 0
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Metal5 VIAFILL 81 0
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Metal5 VIAFILLOPC 81 0

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