Updated the custom additions to sky130_fd_sc_hd with a size-2 fill an…

…d decap cells with graded amounts of poly which can be used to hit a specific overall target poly density.
RTimothyEdwards · Dec 10, 2024 · a67574f · a67574f
1 parent b9bcc58
commit a67574f
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diff --git a/VERSION b/VERSION
@@ -1 +1 @@
-1.0.504
+1.0.505
diff --git a/sky130/custom/sky130_fd_sc_hd/Readme.txt b/sky130/custom/sky130_fd_sc_hd/Readme.txt
@@ -3,3 +3,5 @@ These decap cells were redesigned to cut back on its use of the LI layer because
 The fill cells were redesigned to add tap diffusion in the middle because otherwise the spacing of the nwells and the height of the cells prevents FOM fill, resulting in a different density error.
 
 Cell "newfill_12" was added to satisfy the change in the poly density rule to 38%;  this cell is effectively the decap_12 cell with the poly removed, rendering it a fill cell.  Its use is to replace some percentage of decap_12 cells until the maximum poly density rule is satisfied.
+
+12/10/2024:  Cell "newfill_12" was removed and replace with (a modified version of) "fill_12", which serves the same purpose but avoids the error in "newfill_12" where the nwell did not extend to the edge and would cause nwell spacing violations.  Because SkyWater imposed stricter limits on poly density, cells "decap_20_12", "decap_40_12", "decap_60_12", and "decap_80_12" have been added to allow selection of poly densities in the decap (relative to the original cell) to meet an overall target poly density in a design.
diff --git a/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__decap_20_12.gds b/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__decap_20_12.gds
diff --git a/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__decap_40_12.gds b/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__decap_40_12.gds
diff --git a/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__decap_60_12.gds b/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__decap_60_12.gds
diff --git a/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__decap_80_12.gds b/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__decap_80_12.gds
diff --git a/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__fill_12.gds b/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__fill_12.gds
diff --git a/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__fill_2.gds b/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__fill_2.gds
diff --git a/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__newfill_12.gds b/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__newfill_12.gds
diff --git a/...sc_hd/lef/sky130_ef_sc_hd__newfill_12.lef → ...c_hd/lef/sky130_ef_sc_hd__decap_20_12.lef b/...sc_hd/lef/sky130_ef_sc_hd__newfill_12.lef → ...c_hd/lef/sky130_ef_sc_hd__decap_20_12.lef
@@ -2,9 +2,9 @@ VERSION 5.7 ;
   NOWIREEXTENSIONATPIN ON ;
   DIVIDERCHAR "/" ;
   BUSBITCHARS "[]" ;
-MACRO sky130_ef_sc_hd__newfill_12
+MACRO sky130_ef_sc_hd__decap_20_12
   CLASS CORE SPACER ;
-  FOREIGN sky130_ef_sc_hd__newfill_12 ;
+  FOREIGN sky130_ef_sc_hd__decap_20_12 ;
   ORIGIN 0.000 0.000 ;
   SIZE 5.520 BY 2.720 ;
   SYMMETRY X Y R90 ;
@@ -74,6 +74,6 @@ MACRO sky130_ef_sc_hd__newfill_12
         RECT 4.745 -0.085 4.915 0.085 ;
         RECT 5.205 -0.085 5.375 0.085 ;
   END
-END sky130_ef_sc_hd__newfill_12
+END sky130_ef_sc_hd__decap_20_12
 END LIBRARY
 
diff --git a/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__decap_40_12.lef b/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__decap_40_12.lef
@@ -0,0 +1,79 @@
+VERSION 5.7 ;
+  NOWIREEXTENSIONATPIN ON ;
+  DIVIDERCHAR "/" ;
+  BUSBITCHARS "[]" ;
+MACRO sky130_ef_sc_hd__decap_40_12
+  CLASS CORE SPACER ;
+  FOREIGN sky130_ef_sc_hd__decap_40_12 ;
+  ORIGIN 0.000 0.000 ;
+  SIZE 5.520 BY 2.720 ;
+  SYMMETRY X Y R90 ;
+  SITE unithd ;
+  PIN VPWR
+    USE POWER ;
+    PORT
+      LAYER met1 ;
+        RECT 0.000 2.480 5.520 2.960 ;
+    END
+  END VPWR
+  PIN VGND
+    USE GROUND ;
+    PORT
+      LAYER met1 ;
+        RECT 0.000 -0.240 5.520 0.240 ;
+    END
+  END VGND
+  PIN VPB
+    DIRECTION INOUT ;
+    USE POWER ;
+    PORT
+      LAYER nwell ;
+        RECT -0.190 1.305 5.710 2.910 ;
+    END
+  END VPB
+  PIN VNB
+    DIRECTION INOUT ;
+    USE GROUND ;
+    PORT
+      LAYER pwell ;
+        RECT 0.005 0.105 5.515 0.915 ;
+        RECT 0.145 -0.085 0.315 0.105 ;
+    END
+  END VNB
+  OBS
+      LAYER li1 ;
+        RECT 0.000 2.635 5.520 2.805 ;
+        RECT 0.085 2.200 5.430 2.635 ;
+        RECT 1.670 0.630 2.010 1.460 ;
+        RECT 3.490 0.950 3.840 2.200 ;
+        RECT 0.085 0.085 5.430 0.630 ;
+        RECT 0.000 -0.085 5.520 0.085 ;
+      LAYER mcon ;
+        RECT 0.145 2.635 0.315 2.805 ;
+        RECT 0.605 2.635 0.775 2.805 ;
+        RECT 1.065 2.635 1.235 2.805 ;
+        RECT 1.525 2.635 1.695 2.805 ;
+        RECT 1.985 2.635 2.155 2.805 ;
+        RECT 2.445 2.635 2.615 2.805 ;
+        RECT 2.905 2.635 3.075 2.805 ;
+        RECT 3.365 2.635 3.535 2.805 ;
+        RECT 3.825 2.635 3.995 2.805 ;
+        RECT 4.285 2.635 4.455 2.805 ;
+        RECT 4.745 2.635 4.915 2.805 ;
+        RECT 5.205 2.635 5.375 2.805 ;
+        RECT 0.145 -0.085 0.315 0.085 ;
+        RECT 0.605 -0.085 0.775 0.085 ;
+        RECT 1.065 -0.085 1.235 0.085 ;
+        RECT 1.525 -0.085 1.695 0.085 ;
+        RECT 1.985 -0.085 2.155 0.085 ;
+        RECT 2.445 -0.085 2.615 0.085 ;
+        RECT 2.905 -0.085 3.075 0.085 ;
+        RECT 3.365 -0.085 3.535 0.085 ;
+        RECT 3.825 -0.085 3.995 0.085 ;
+        RECT 4.285 -0.085 4.455 0.085 ;
+        RECT 4.745 -0.085 4.915 0.085 ;
+        RECT 5.205 -0.085 5.375 0.085 ;
+  END
+END sky130_ef_sc_hd__decap_40_12
+END LIBRARY
+
diff --git a/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__decap_60_12.lef b/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__decap_60_12.lef
@@ -0,0 +1,79 @@
+VERSION 5.7 ;
+  NOWIREEXTENSIONATPIN ON ;
+  DIVIDERCHAR "/" ;
+  BUSBITCHARS "[]" ;
+MACRO sky130_ef_sc_hd__decap_60_12
+  CLASS CORE SPACER ;
+  FOREIGN sky130_ef_sc_hd__decap_60_12 ;
+  ORIGIN 0.000 0.000 ;
+  SIZE 5.520 BY 2.720 ;
+  SYMMETRY X Y R90 ;
+  SITE unithd ;
+  PIN VPWR
+    USE POWER ;
+    PORT
+      LAYER met1 ;
+        RECT 0.000 2.480 5.520 2.960 ;
+    END
+  END VPWR
+  PIN VGND
+    USE GROUND ;
+    PORT
+      LAYER met1 ;
+        RECT 0.000 -0.240 5.520 0.240 ;
+    END
+  END VGND
+  PIN VPB
+    DIRECTION INOUT ;
+    USE POWER ;
+    PORT
+      LAYER nwell ;
+        RECT -0.190 1.305 5.710 2.910 ;
+    END
+  END VPB
+  PIN VNB
+    DIRECTION INOUT ;
+    USE GROUND ;
+    PORT
+      LAYER pwell ;
+        RECT 0.005 0.105 5.515 0.915 ;
+        RECT 0.145 -0.085 0.315 0.105 ;
+    END
+  END VNB
+  OBS
+      LAYER li1 ;
+        RECT 0.000 2.635 5.520 2.805 ;
+        RECT 0.085 2.200 5.430 2.635 ;
+        RECT 1.670 0.630 2.010 1.460 ;
+        RECT 3.490 0.950 3.840 2.200 ;
+        RECT 0.085 0.085 5.430 0.630 ;
+        RECT 0.000 -0.085 5.520 0.085 ;
+      LAYER mcon ;
+        RECT 0.145 2.635 0.315 2.805 ;
+        RECT 0.605 2.635 0.775 2.805 ;
+        RECT 1.065 2.635 1.235 2.805 ;
+        RECT 1.525 2.635 1.695 2.805 ;
+        RECT 1.985 2.635 2.155 2.805 ;
+        RECT 2.445 2.635 2.615 2.805 ;
+        RECT 2.905 2.635 3.075 2.805 ;
+        RECT 3.365 2.635 3.535 2.805 ;
+        RECT 3.825 2.635 3.995 2.805 ;
+        RECT 4.285 2.635 4.455 2.805 ;
+        RECT 4.745 2.635 4.915 2.805 ;
+        RECT 5.205 2.635 5.375 2.805 ;
+        RECT 0.145 -0.085 0.315 0.085 ;
+        RECT 0.605 -0.085 0.775 0.085 ;
+        RECT 1.065 -0.085 1.235 0.085 ;
+        RECT 1.525 -0.085 1.695 0.085 ;
+        RECT 1.985 -0.085 2.155 0.085 ;
+        RECT 2.445 -0.085 2.615 0.085 ;
+        RECT 2.905 -0.085 3.075 0.085 ;
+        RECT 3.365 -0.085 3.535 0.085 ;
+        RECT 3.825 -0.085 3.995 0.085 ;
+        RECT 4.285 -0.085 4.455 0.085 ;
+        RECT 4.745 -0.085 4.915 0.085 ;
+        RECT 5.205 -0.085 5.375 0.085 ;
+  END
+END sky130_ef_sc_hd__decap_60_12
+END LIBRARY
+
diff --git a/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__decap_80_12.lef b/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__decap_80_12.lef
@@ -0,0 +1,79 @@
+VERSION 5.7 ;
+  NOWIREEXTENSIONATPIN ON ;
+  DIVIDERCHAR "/" ;
+  BUSBITCHARS "[]" ;
+MACRO sky130_ef_sc_hd__decap_80_12
+  CLASS CORE SPACER ;
+  FOREIGN sky130_ef_sc_hd__decap_80_12 ;
+  ORIGIN 0.000 0.000 ;
+  SIZE 5.520 BY 2.720 ;
+  SYMMETRY X Y R90 ;
+  SITE unithd ;
+  PIN VPWR
+    USE POWER ;
+    PORT
+      LAYER met1 ;
+        RECT 0.000 2.480 5.520 2.960 ;
+    END
+  END VPWR
+  PIN VGND
+    USE GROUND ;
+    PORT
+      LAYER met1 ;
+        RECT 0.000 -0.240 5.520 0.240 ;
+    END
+  END VGND
+  PIN VPB
+    DIRECTION INOUT ;
+    USE POWER ;
+    PORT
+      LAYER nwell ;
+        RECT -0.190 1.305 5.710 2.910 ;
+    END
+  END VPB
+  PIN VNB
+    DIRECTION INOUT ;
+    USE GROUND ;
+    PORT
+      LAYER pwell ;
+        RECT 0.005 0.105 5.515 0.915 ;
+        RECT 0.145 -0.085 0.315 0.105 ;
+    END
+  END VNB
+  OBS
+      LAYER li1 ;
+        RECT 0.000 2.635 5.520 2.805 ;
+        RECT 0.085 2.200 5.430 2.635 ;
+        RECT 1.670 0.630 2.010 1.460 ;
+        RECT 3.490 0.950 3.840 2.200 ;
+        RECT 0.085 0.085 5.430 0.630 ;
+        RECT 0.000 -0.085 5.520 0.085 ;
+      LAYER mcon ;
+        RECT 0.145 2.635 0.315 2.805 ;
+        RECT 0.605 2.635 0.775 2.805 ;
+        RECT 1.065 2.635 1.235 2.805 ;
+        RECT 1.525 2.635 1.695 2.805 ;
+        RECT 1.985 2.635 2.155 2.805 ;
+        RECT 2.445 2.635 2.615 2.805 ;
+        RECT 2.905 2.635 3.075 2.805 ;
+        RECT 3.365 2.635 3.535 2.805 ;
+        RECT 3.825 2.635 3.995 2.805 ;
+        RECT 4.285 2.635 4.455 2.805 ;
+        RECT 4.745 2.635 4.915 2.805 ;
+        RECT 5.205 2.635 5.375 2.805 ;
+        RECT 0.145 -0.085 0.315 0.085 ;
+        RECT 0.605 -0.085 0.775 0.085 ;
+        RECT 1.065 -0.085 1.235 0.085 ;
+        RECT 1.525 -0.085 1.695 0.085 ;
+        RECT 1.985 -0.085 2.155 0.085 ;
+        RECT 2.445 -0.085 2.615 0.085 ;
+        RECT 2.905 -0.085 3.075 0.085 ;
+        RECT 3.365 -0.085 3.535 0.085 ;
+        RECT 3.825 -0.085 3.995 0.085 ;
+        RECT 4.285 -0.085 4.455 0.085 ;
+        RECT 4.745 -0.085 4.915 0.085 ;
+        RECT 5.205 -0.085 5.375 0.085 ;
+  END
+END sky130_ef_sc_hd__decap_80_12
+END LIBRARY
+
diff --git a/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__fill_12.lef b/sky130/custom/sky130_fd_sc_hd/lef/sky130_ef_sc_hd__fill_12.lef
@@ -28,25 +28,25 @@ MACRO sky130_ef_sc_hd__fill_12
     USE POWER ;
     PORT
       LAYER nwell ;
-        RECT -0.190 1.305 2.950 2.910 ;
+        RECT -0.190 1.305 5.710 2.910 ;
     END
   END VPB
   PIN VNB
     DIRECTION INOUT ;
     USE GROUND ;
     PORT
       LAYER pwell ;
-        RECT 0.005 0.105 2.755 0.915 ;
+        RECT 0.005 0.105 5.515 0.915 ;
         RECT 0.145 -0.085 0.315 0.105 ;
     END
   END VNB
   OBS
       LAYER li1 ;
         RECT 0.000 2.635 5.520 2.805 ;
-        RECT 0.085 1.545 2.675 2.635 ;
-        RECT 0.085 0.855 1.295 1.375 ;
-        RECT 1.465 1.025 2.675 1.545 ;
-        RECT 0.085 0.085 2.675 0.855 ;
+        RECT 0.085 2.200 5.430 2.635 ;
+        RECT 1.670 0.630 2.010 1.460 ;
+        RECT 3.490 0.950 3.840 2.200 ;
+        RECT 0.085 0.085 5.430 0.630 ;
         RECT 0.000 -0.085 5.520 0.085 ;
       LAYER mcon ;
         RECT 0.145 2.635 0.315 2.805 ;

diff --git a/sky130/custom/sky130_fd_sc_hd/verilog/sky130_ef_sc_hd__decap_20_12.v b/sky130/custom/sky130_fd_sc_hd/verilog/sky130_ef_sc_hd__decap_20_12.v
@@ -0,0 +1,98 @@
+/**
+ * Copyright 2020 The SkyWater PDK Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+`ifndef SKY130_EF_SC_HD__DECAP_20_12_V
+`define SKY130_EF_SC_HD__DECAP_20_12_V
+
+/**
+ * decap: Decoupling capacitance filler.
+ *
+ * Verilog wrapper for decap with size of 12 units.
+ * This cell has been modified from sky130_fd_sc_hd__decap_12
+ * to remove excess LI, so that when used extensively in a
+ * padded region of a digital layout, it does not cause the
+ * LI layer to exceed critical density.  Additionally, this
+ * cell was modified from sky130_ef_sc_hd__decap_12 to remove
+ * excess poly, so that when used extensively in a padded
+ * region of a digital layout, it does not cause the POLY
+ * layer to exceed critical density.  A combination of
+ * cells _20_12, _40_12, _60_12, and _80_12 (representing
+ * 20, 40, 60, and 80 percent of the original amount of poly)
+ * can be used to achieve a target poly density.
+ *
+ * WARNING: This file is autogenerated, do not modify directly!
+ */
+
+`timescale 1ns / 1ps
+`default_nettype none
+
+`ifdef USE_POWER_PINS
+/*********************************************************/
+
+`celldefine
+module sky130_ef_sc_hd__decap_20_12 (
+    VPWR,
+    VGND,
+    VPB ,
+    VNB
+);
+
+    // Module ports
+    input VPWR;
+    input VGND;
+    input VPB ;
+    input VNB ;
+    // No contents.
+endmodule
+`endcelldefine
+
+/*********************************************************/
+`else // If not USE_POWER_PINS
+/*********************************************************/
+
+`ifdef FUNCTIONAL
+
+`celldefine
+module sky130_ef_sc_hd__decap_20_12 ();
+    // No contents.
+endmodule
+`endcelldefine
+
+`else // If not FUNCTIONAL
+
+`celldefine
+module sky130_ef_sc_hd__decap_20_12 ();
+
+    // Voltage supply signals
+    supply1 VPWR;
+    supply0 VGND;
+    supply1 VPB ;
+    supply0 VNB ;
+    // No contents.
+endmodule
+`endcelldefine
+
+`endif // If not FUNCTIONAL
+
+/*********************************************************/
+`endif // If not USE_POWER_PINS
+
+`default_nettype wire
+`endif  // SKY130_EF_SC_HD__DECAP_20_12_V
+
+
Original file line number	Diff line number	Diff line change
Expand Up		@@ -3,3 +3,5 @@ These decap cells were redesigned to cut back on its use of the LI layer because
		The fill cells were redesigned to add tap diffusion in the middle because otherwise the spacing of the nwells and the height of the cells prevents FOM fill, resulting in a different density error.

		Cell "newfill_12" was added to satisfy the change in the poly density rule to 38%; this cell is effectively the decap_12 cell with the poly removed, rendering it a fill cell. Its use is to replace some percentage of decap_12 cells until the maximum poly density rule is satisfied.

		12/10/2024: Cell "newfill_12" was removed and replace with (a modified version of) "fill_12", which serves the same purpose but avoids the error in "newfill_12" where the nwell did not extend to the edge and would cause nwell spacing violations. Because SkyWater imposed stricter limits on poly density, cells "decap_20_12", "decap_40_12", "decap_60_12", and "decap_80_12" have been added to allow selection of poly densities in the decap (relative to the original cell) to meet an overall target poly density in a design.