add configurable latch Verilog codes

openfpga_flow/VerilogNetlists/config_latch.v

@@ -0,0 +1,38 @@
+//-----------------------------------------------------
+// Design Name : config_latch
+// File Name   : config_latch.v
+// Function    : A Configurable Latch where data storage
+//               can be updated at rising clock edge 
+//               when wl is enabled
+// Coder       : Xifan TANG
+//-----------------------------------------------------
+module config_latch (
+  input reset, // Reset input
+  input clk, // Clock Input
+  input wl, // Data Enable
+  input bl, // Data Input
+  output Q, // Q output
+  output Qb // Q output
+);
+//------------Internal Variables--------
+reg q_reg;
+
+//-------------Code Starts Here---------
+always @ ( posedge clk or posedge reset) begin
+  if (reset) begin
+    q_reg <= 1'b0;
+  end else if (1'b1 == wl) begin
+    q_reg <= bl;
+  end
+end
+
+`ifndef ENABLE_FORMAL_VERIFICATION
+// Wire q_reg to Q
+assign Q = q_reg;
+assign Qb = ~q_reg;
+`else
+assign Q = 1'bZ;
+assign Qb = !Q;
+`endif
+
+endmodule