diff --git a/src/kyupy/sdf.py b/src/kyupy/sdf.py
index 015f975..ca9f7ef 100644
--- a/src/kyupy/sdf.py
+++ b/src/kyupy/sdf.py
@@ -156,6 +156,10 @@ class SdfTransformer(Transformer):
         entries = [e for a in args if hasattr(a, 'children') for e in a.children]
         return name, entries
 
+    @staticmethod
+    def cond(args):  # ignore conditions
+        return args[1]
+
     @staticmethod
     def start(args):
         name = next((a for a in args if isinstance(a, str)), None)
@@ -180,9 +184,12 @@ GRAMMAR = r"""
         | "(INSTANCE" ID? ")"
         | "(TIMINGCHECK" _ignore* ")"
         | delay )* ")"
-    delay: "(DELAY" "(ABSOLUTE" (interconnect | iopath)* ")" ")"
+    delay: "(DELAY" "(ABSOLUTE" (interconnect | iopath | cond)* ")" ")"
     interconnect: "(INTERCONNECT" ID ID triple* ")"
     iopath: "(IOPATH" ID_OR_EDGE ID_OR_EDGE triple* ")"
+    cond: "(" "COND" cond_port_expr iopath ")"
+    ?cond_port_expr: ID | "(" cond_port_expr ")" | cond_port_expr BINARY_OP cond_port_expr
+    BINARY_OP: /&&/ | /==/
     NAME: /[^"]+/
     ID_OR_EDGE: ( /[^() ]+/ | "(" /[^)]+/ ")" )
     ID: ( /[^"() ]+/ | "\"" /[^"]+/ "\"" )
diff --git a/tests/gates.sdf b/tests/gates.sdf
index 1652ff0..529a06b 100644
--- a/tests/gates.sdf
+++ b/tests/gates.sdf
@@ -7,22 +7,49 @@
 (TEMPERATURE 25.00:25.00:25.00)
 (TIMESCALE 1ns)
 (CELL
-  (CELLTYPE "NAND2X1")
+  (CELLTYPE "NAND2_X1")
   (INSTANCE nandgate)
   (DELAY
     (ABSOLUTE
-    (IOPATH IN1 QN (0.099:0.103:0.103) (0.122:0.127:0.127))
-    (IOPATH IN2 QN (0.083:0.086:0.086) (0.100:0.104:0.104))
+    (IOPATH A1 ZN (0.099:0.103:0.103) (0.122:0.127:0.127))
+    (IOPATH A2 ZN (0.083:0.086:0.086) (0.100:0.104:0.104))
     )
   )
 )
 (CELL
-  (CELLTYPE "AND2X1")
+  (CELLTYPE "AND2_X1")
   (INSTANCE andgate)
   (DELAY
     (ABSOLUTE
-    (IOPATH IN1 Q (0.367:0.378:0.378) (0.351:0.377:0.377))
-    (IOPATH IN2 Q (0.366:0.375:0.375) (0.359:0.370:0.370))
+    (IOPATH A1 ZN (0.367:0.378:0.378) (0.351:0.377:0.377))
+    (IOPATH A2 ZN (0.366:0.375:0.375) (0.359:0.370:0.370))
+    )
+  )
+)
+(CELL
+  (CELLTYPE "OAI21_X1")
+  (INSTANCE oai21gate)
+  (DELAY 
+    (ABSOLUTE
+    (IOPATH B1 ZN (0.000:0.025:0.025) (0.000:0.013:0.013))
+    (IOPATH B2 ZN (0.000:0.030:0.030) (0.000:0.016:0.016))
+    ( COND (B1 == 1'b0) && (B2 == 1'b1) (IOPATH A ZN (0.000:0.018:0.018)))
+    (COND (B1 == 1'b1) && (B2 == 1'b0) (IOPATH A ZN (0.000:0.018:0.018) (0.000:0.016:0.016)))
+    (COND (B1 == 1'b1) && (B2 == 1'b1) (IOPATH A ZN (0.000:0.019:0.019) (0.000:0.014:0.014)))
+    )
+  )
+)
+(CELL
+  (CELLTYPE "MUX2_X1")
+  (INSTANCE mux2gate)
+  (DELAY 
+    (ABSOLUTE
+    (COND (B == 1'b0) && (S == 1'b0) (IOPATH A Z (0.000:0.037:0.037) (0.000:0.058:0.058)))
+    (COND (B == 1'b1) && (S == 1'b0) (IOPATH A Z (0.000:0.037:0.037) (0.000:0.058:0.058)))
+    (COND (A == 1'b0) && (S == 1'b1) (IOPATH B Z (0.000:0.035:0.035) (0.000:0.056:0.056)))
+    (COND (A == 1'b1) && (S == 1'b1) (IOPATH B Z (0.000:0.035:0.035) (0.000:0.056:0.056)))
+    (COND (A == 1'b0) && (B == 1'b1) (IOPATH S Z (0.000:0.047:0.047) (0.000:0.073:0.073)))
+    (COND (A == 1'b1) && (B == 1'b0) (IOPATH S Z (0.000:0.072:0.072) (0.000:0.064:0.064)))
     )
   )
 )
diff --git a/tests/gates.v b/tests/gates.v
index 2fa07cd..0925bf6 100644
--- a/tests/gates.v
+++ b/tests/gates.v
@@ -1,11 +1,15 @@
-module gates (a, b, o0, o1 );
+module gates (a, b, c, o0, o1, o2, o3 );
 input a;
 input b;
+input c;
 output o0;
 output o1;
+output o2;
+output o3;
 
-AND2X1 andgate (.IN1 ( a ) , .IN2 ( b ) , .Q ( o0 ) ) ;
-NAND2X1 nandgate (.IN1 ( a ) , .IN2 ( b ) , .QN ( o1 ) ) ;
-
+AND2_X1 andgate (.A1 ( a ) , .A2 ( b ) , .ZN ( o0 ) ) ;
+NAND2_X1 nandgate (.A1 ( a ) , .A2 ( b ) , .ZN ( o1 ) ) ;
+OAI21_X1 oai21gate (.B1(a), .B2(b), .A(c), .ZN(o2) ) ;
+MUX2_X1 mux2gate (.A(a), .B(b), .S(c), .Z(o3)) ;
 
 endmodule
\ No newline at end of file
diff --git a/tests/test_sdf.py b/tests/test_sdf.py
index e94285b..9ca4627 100644
--- a/tests/test_sdf.py
+++ b/tests/test_sdf.py
@@ -2,7 +2,7 @@ import numpy as np
 
 from kyupy import sdf, verilog, bench
 from kyupy.wave_sim import WaveSim, TMAX, TMIN
-from kyupy.techlib import SAED32, SAED90
+from kyupy.techlib import SAED32, NANGATE45
 
 def test_parse():
     test = '''
@@ -80,9 +80,9 @@ def test_b15(mydir):
 
 
 def test_gates(mydir):
-    c = verilog.load(mydir / 'gates.v', tlib=SAED90)
+    c = verilog.load(mydir / 'gates.v', tlib=NANGATE45)
     df = sdf.load(mydir / 'gates.sdf')
-    lt = df.iopaths(c, tlib=SAED90)[1]
+    lt = df.iopaths(c, tlib=NANGATE45)[1]
     nand_a = c.cells['nandgate'].ins[0]
     nand_b = c.cells['nandgate'].ins[1]
     and_a = c.cells['andgate'].ins[0]
diff --git a/tests/test_verilog.py b/tests/test_verilog.py
index 87bbe73..816c12b 100644
--- a/tests/test_verilog.py
+++ b/tests/test_verilog.py
@@ -1,5 +1,5 @@
 from kyupy import verilog
-from kyupy.techlib import SAED90, SAED32
+from kyupy.techlib import SAED90, SAED32, NANGATE45
 
 def test_b01(mydir):
     with open(mydir / 'b01.v', 'r') as f:
@@ -26,12 +26,12 @@ def test_b15(mydir):
 
 
 def test_gates(mydir):
-    c = verilog.load(mydir / 'gates.v', tlib=SAED90)
-    assert len(c.nodes) == 10
-    assert len(c.lines) == 10
+    c = verilog.load(mydir / 'gates.v', tlib=NANGATE45)
+    assert len(c.nodes) == 18
+    assert len(c.lines) == 21
     stats = c.stats
-    assert stats['input'] == 2
-    assert stats['output'] == 2
+    assert stats['input'] == 3
+    assert stats['output'] == 4
     assert stats['__seq__'] == 0