initial import

tests/asicworld/code_hdl_models_serial_crc.v

@@ -0,0 +1,54 @@
+//-----------------------------------------------------
+// Design Name : serial_crc_ccitt
+// File Name   : serial_crc.v
+// Function    : CCITT Serial CRC
+// Coder       : Deepak Kumar Tala
+//-----------------------------------------------------
+module serial_crc_ccitt (
+clk     ,
+reset   ,
+enable  ,
+init    , 
+data_in , 
+crc_out
+);
+//-----------Input Ports---------------
+input clk     ;
+input reset   ;
+input enable  ;
+input init    ;
+input data_in ;
+//-----------Output Ports---------------
+output [15:0] crc_out;
+//------------Internal Variables--------
+reg   [15:0] lfsr;
+//-------------Code Start-----------------
+assign crc_out = lfsr;
+// Logic to CRC Calculation
+always @ (posedge clk)
+if (reset) begin
+  lfsr <= 16'hFFFF;
+end else if (enable) begin
+  if (init) begin
+    lfsr <=  16'hFFFF;
+  end else begin
+    lfsr[0]  <= data_in ^ lfsr[15];
+    lfsr[1]  <= lfsr[0];
+    lfsr[2]  <= lfsr[1];
+    lfsr[3]  <= lfsr[2];
+    lfsr[4]  <= lfsr[3];
+    lfsr[5]  <= lfsr[4] ^ data_in ^ lfsr[15];
+    lfsr[6]  <= lfsr[5];
+    lfsr[7]  <= lfsr[6];
+    lfsr[8]  <= lfsr[7];
+    lfsr[9]  <= lfsr[8];
+    lfsr[10] <= lfsr[9];
+    lfsr[11] <= lfsr[10];
+    lfsr[12] <= lfsr[11] ^ data_in ^ lfsr[15];
+    lfsr[13] <= lfsr[12];
+    lfsr[14] <= lfsr[13];
+    lfsr[15] <= lfsr[14];
+  end
+end 
+
+endmodule