Added test for floating device terminals.

src/lvs/unit_tests/lvsSimpleTests.cc

@@ -143,3 +143,8 @@ TEST(14_simple_ringo_mixed_hierarchy)
 {
   run_test (_this, "ringo_mixed_hierarchy", "ringo_mixed_hierarchy.gds");
 }
+
+TEST(15_simple_dummy_device)
+{
+  run_test (_this, "ringo_simple_dummy_device", "ringo_dummy_device.gds");
+}

testdata/lvs/ringo_dummy_device.cir

@@ -0,0 +1,28 @@
+
+.SUBCKT RINGO VSS VDD FB ENABLE OUT
+X$1 VDD 1 VSS VDD FB ENABLE VSS ND2X1
+X$2 VDD 2 VSS VDD 1 VSS INVX1
+X$3 VDD 3 VSS VDD 2 VSS INVX1
+X$4 VDD 4 VSS VDD 3 VSS INVX1
+X$5 VDD 5 VSS VDD 4 VSS INVX1
+X$6 VDD 6 VSS VDD 5 VSS INVX1
+X$7 VDD 7 VSS VDD 6 VSS INVX1
+X$8 VDD 8 VSS VDD 7 VSS INVX1
+X$9 VDD 9 VSS VDD 8 VSS INVX1
+X$10 VDD 10 VSS VDD 9 VSS INVX1
+X$11 VDD FB VSS VDD 10 VSS INVX1
+X$12 VDD OUT VSS VDD FB VSS INVX1
+M$1 VSS DUMMY VSS VSS NMOS L=0.25U W=0.95U 
+.ENDS RINGO
+
+.SUBCKT ND2X1 VDD OUT VSS NWELL B A BULK
+M$1 OUT A VDD NWELL PMOS L=0.25U W=1.5U 
+M$2 VDD B OUT NWELL PMOS L=0.25U W=1.5U 
+M$3 VSS A 1 BULK NMOS L=0.25U W=0.95U 
+M$4 1 B OUT BULK NMOS L=0.25U W=0.95U 
+.ENDS ND2X1
+
+.SUBCKT INVX1 VDD OUT VSS NWELL IN BULK
+M$1 VDD IN OUT NWELL PMOS L=0.25U W=1.5U 
+M$2 VSS IN OUT BULK NMOS L=0.25U W=0.95U 
+.ENDS INVX1

testdata/lvs/ringo_simple_dummy_device.cir

@@ -0,0 +1,85 @@
+* Extracted by KLayout
+
+* cell RINGO
+* pin FB
+* pin VDD
+* pin OUT
+* pin ENABLE
+* pin VSS
+.SUBCKT RINGO 11 12 13 14 15
+* net 11 FB
+* net 12 VDD
+* net 13 OUT
+* net 14 ENABLE
+* net 15 VSS
+* cell instance $3 r0 *1 1.8,0
+X$3 12 1 15 12 11 14 15 ND2X1
+* cell instance $4 r0 *1 4.2,0
+X$4 12 2 15 12 1 15 INVX1
+* cell instance $5 r0 *1 6,0
+X$5 12 3 15 12 2 15 INVX1
+* cell instance $6 r0 *1 7.8,0
+X$6 12 4 15 12 3 15 INVX1
+* cell instance $7 r0 *1 9.6,0
+X$7 12 5 15 12 4 15 INVX1
+* cell instance $8 r0 *1 11.4,0
+X$8 12 6 15 12 5 15 INVX1
+* cell instance $9 r0 *1 13.2,0
+X$9 12 7 15 12 6 15 INVX1
+* cell instance $10 r0 *1 15,0
+X$10 12 8 15 12 7 15 INVX1
+* cell instance $11 r0 *1 16.8,0
+X$11 12 9 15 12 8 15 INVX1
+* cell instance $12 r0 *1 18.6,0
+X$12 12 10 15 12 9 15 INVX1
+* cell instance $13 r0 *1 20.4,0
+X$13 12 11 15 12 10 15 INVX1
+* cell instance $14 r0 *1 22.2,0
+X$14 12 13 15 12 11 15 INVX1
+* device instance $1 r0 *1 26.45,2.075 NMOS
+M$1 15 16 15 15 NMOS L=0.25U W=0.95U AS=0.40375P AD=0.40375P PS=2.75U PD=2.75U
+.ENDS RINGO
+
+* cell INVX1
+* pin VDD
+* pin OUT
+* pin VSS
+* pin 
+* pin IN
+* pin SUBSTRATE
+.SUBCKT INVX1 1 2 3 4 5 6
+* net 1 VDD
+* net 2 OUT
+* net 3 VSS
+* net 5 IN
+* net 6 SUBSTRATE
+* device instance $1 r0 *1 0.85,5.8 PMOS
+M$1 1 5 2 4 PMOS L=0.25U W=1.5U AS=0.6375P AD=0.6375P PS=3.85U PD=3.85U
+* device instance $2 r0 *1 0.85,2.135 NMOS
+M$2 3 5 2 6 NMOS L=0.25U W=0.95U AS=0.40375P AD=0.40375P PS=2.75U PD=2.75U
+.ENDS INVX1
+
+* cell ND2X1
+* pin VDD
+* pin OUT
+* pin VSS
+* pin 
+* pin B
+* pin A
+* pin SUBSTRATE
+.SUBCKT ND2X1 1 2 3 4 5 6 7
+* net 1 VDD
+* net 2 OUT
+* net 3 VSS
+* net 5 B
+* net 6 A
+* net 7 SUBSTRATE
+* device instance $1 r0 *1 0.85,5.8 PMOS
+M$1 2 6 1 4 PMOS L=0.25U W=1.5U AS=0.6375P AD=0.3375P PS=3.85U PD=1.95U
+* device instance $2 r0 *1 1.55,5.8 PMOS
+M$2 1 5 2 4 PMOS L=0.25U W=1.5U AS=0.3375P AD=0.6375P PS=1.95U PD=3.85U
+* device instance $3 r0 *1 0.85,2.135 NMOS
+M$3 3 6 8 7 NMOS L=0.25U W=0.95U AS=0.40375P AD=0.21375P PS=2.75U PD=1.4U
+* device instance $4 r0 *1 1.55,2.135 NMOS
+M$4 8 5 2 7 NMOS L=0.25U W=0.95U AS=0.21375P AD=0.40375P PS=1.4U PD=2.75U
+.ENDS ND2X1

testdata/lvs/ringo_simple_dummy_device.lvs

@@ -0,0 +1,74 @@
+
+source($lvs_test_source, "RINGO")
+
+report_lvs($lvs_test_target_lvsdb, true)
+
+target_netlist($lvs_test_target_cir, write_spice, "Extracted by KLayout")
+
+schematic("ringo_dummy_device.cir")
+
+deep
+
+# Drawing layers
+
+nwell       = input(1, 0)
+active      = input(2, 0)
+pplus       = input(3, 0)
+nplus       = input(4, 0)
+poly        = input(5, 0)
+contact     = input(8, 0)
+metal1      = input(9, 0)
+via1        = input(10, 0)
+metal2      = input(11, 0)
+
+# Bulk layer for terminal provisioning
+
+bulk        = polygon_layer
+
+# Computed layers
+
+active_in_nwell       = active & nwell
+pactive               = active_in_nwell & pplus
+pgate                 = pactive & poly
+psd                   = pactive - pgate
+ntie                  = active_in_nwell & nplus
+
+active_outside_nwell  = active - nwell
+nactive               = active_outside_nwell & nplus
+ngate                 = nactive & poly
+nsd                   = nactive - ngate
+ptie                  = active_outside_nwell & pplus
+
+# Device extraction
+
+# PMOS transistor device extraction
+extract_devices(mos4("PMOS"), { "SD" => psd, "G" => pgate, "W" => nwell, 
+                                "tS" => psd, "tD" => psd, "tG" => poly, "tW" => nwell })
+
+# NMOS transistor device extraction
+extract_devices(mos4("NMOS"), { "SD" => nsd, "G" => ngate, "W" => bulk, 
+                                "tS" => nsd, "tD" => nsd, "tG" => poly, "tW" => bulk })
+
+# Define connectivity for netlist extraction
+
+# Inter-layer
+connect(psd,        contact)
+connect(nsd,        contact)
+connect(poly,       contact)
+connect(ntie,       contact)
+connect(nwell,      ntie)
+connect(ptie,       contact)
+connect(contact,    metal1)
+connect(metal1,     via1)
+connect(via1,       metal2)
+
+# Global
+connect_global(bulk, "SUBSTRATE")
+connect_global(ptie, "SUBSTRATE")
+
+# Compare section
+
+netlist.simplify
+
+compare
+