Add latch test modified from #1363

1 files changed, 58 insertions, 0 deletions

diff --git a/tests/xilinx/latches.v b/tests/xilinx/latches.v
new file mode 100644
index 000000000..83bad7f35
--- /dev/null
+++ b/tests/xilinx/latches.v
@@ -0,0 +1,58 @@
+module latchp
+    ( input d, en, output reg q );
+	always @*
+		if ( en )
+			q <= d;
+endmodule
+
+module latchn
+    ( input d, en, output reg q );
+	always @*
+		if ( !en )
+			q <= d;
+endmodule
+
+module latchsr
+    ( input d, en, clr, pre, output reg q );
+	always @*
+		if ( clr )
+			q <= 1'b0;
+		else if ( pre )
+			q <= 1'b1;
+		else if ( en )
+			q <= d;
+endmodule
+
+
+module top (
+input clk,
+input clr,
+input pre,
+input a,
+output b,b1,b2
+);
+
+
+latchp u_latchp (
+        .en (clk ),
+        .d (a ),
+        .q (b )
+    );
+
+
+latchn u_latchn (
+        .en (clk ),
+        .d (a ),
+        .q (b1 )
+    );
+
+
+latchsr u_latchsr (
+        .en (clk ),
+        .clr (clr),
+        .pre (pre),
+        .d (a ),
+        .q (b2 )
+    );
+
+endmodule