rename source to src

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diff --git a/source/fcs.v b/source/fcs.v
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-/*
- *       fcs.v
- *       
- *   Copyright (C) 2018, 2019 Mind Chasers Inc.      
- *
- *   Licensed under the Apache License, Version 2.0 (the "License");
- *   you may not use this file except in compliance with the License.
- *   You may obtain a copy of the License at
- *
- *       http://www.apache.org/licenses/LICENSE-2.0
- *
- *   Unless required by applicable law or agreed to in writing, software
- *   distributed under the License is distributed on an "AS IS" BASIS,
- *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *   See the License for the specific language governing permissions and
- *   limitations under the License.
- *
- *	function: FCS checksum
- *		
- *
- */
-`timescale 1ns /10ps
-
-////////////////////////////////////////////////////////////////////////////////
-// Copyright (C) 1999-2008 Easics NV.
-// This source file may be used and distributed without restriction
-// provided that this copyright statement is not removed from the file
-// and that any derivative work contains the original copyright notice
-// and the associated disclaimer.
-//
-// THIS SOURCE FILE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS
-// OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
-// WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
-//
-// Purpose : synthesizable CRC function
-//   * polynomial: x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + 1
-//   * data width: 8
-//
-// Info : tools@easics.be
-//        http://www.easics.com
-////////////////////////////////////////////////////////////////////////////////
-
-/*
-*	a) The first 32 bits of the frame are complemented.
-*	b) The n bits of the MAC frame considered to be the coefficients of a polynomial M(x) of degree n � 1. 
-*		The first bit of the Destination Address field corresponds to the x(n�1) term 
-*		and the last bit of the MAC Client Data field (or Pad field if present) corresponds to the x0 term.
-*	c) M(x) is multiplied by x**32 and divided by G(x), producing a remainder R(x) of degree = 31.
-*	d) The coefficients of R(x) are considered to be a 32-bit sequence.
-*	e) The bit sequence is complemented and the result is the CRC.
-*	f) FCS should be trnansmitted msbit first ( opposite of the rest of MAC frame )
-*/
-module fcs(
-	input rstn,
-	input clk,
-	
-	// control interface
-	input init,
-	input enable, 
-	
-	// addr & data
-	input [1:0] addr,
-	input [0:7] din,
-	output [7:0] dout
-);
-
-
-reg [31:0] crc;
-reg [7:0] d;
-
-assign dout = ~{ d[0],d[1],d[2],d[3],d[4],d[5],d[6],d[7] };
-
-always @(*)
-	begin
-		case(addr)
-			2'b00:	d <= crc[31:24];
-			2'b01:	d <= crc[23:16];
-			2'b10:	d <= crc[15:8];
-			2'b11:	d <= crc[7:0];
-		endcase
-	end
-
-always @(posedge clk or negedge rstn)
-	if(!rstn)
-		crc <= 32'hffffffff;
-	else if (init)
-		crc <= 32'hffffffff;
-	else if (enable)
-		crc <= nextCRC32_D8(din,crc);
-
-// {d[0],d[1],d[2],d[3],d[4],d[5],d[6],d[7]}
-
-  // polynomial: x^32 + x^26 + x^23 + x^22 + x^16 + x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + 1
-  // data width: 8
-  // convention: the first serial bit is D[7]
-  function [31:0] nextCRC32_D8;
-
-    input [0:7] Data;
-    input [31:0] crc;
-    reg [0:7] d;
-    reg [31:0] c;
-    reg [31:0] newcrc;
-  begin
-    d = Data;
-    c = crc;
-
-    newcrc[0] = d[6] ^ d[0] ^ c[24] ^ c[30];
-    newcrc[1] = d[7] ^ d[6] ^ d[1] ^ d[0] ^ c[24] ^ c[25] ^ c[30] ^ c[31];
-    newcrc[2] = d[7] ^ d[6] ^ d[2] ^ d[1] ^ d[0] ^ c[24] ^ c[25] ^ c[26] ^ c[30] ^ c[31];
-    newcrc[3] = d[7] ^ d[3] ^ d[2] ^ d[1] ^ c[25] ^ c[26] ^ c[27] ^ c[31];
-    newcrc[4] = d[6] ^ d[4] ^ d[3] ^ d[2] ^ d[0] ^ c[24] ^ c[26] ^ c[27] ^ c[28] ^ c[30];
-    newcrc[5] = d[7] ^ d[6] ^ d[5] ^ d[4] ^ d[3] ^ d[1] ^ d[0] ^ c[24] ^ c[25] ^ c[27] ^ c[28] ^ c[29] ^ c[30] ^ c[31];
-    newcrc[6] = d[7] ^ d[6] ^ d[5] ^ d[4] ^ d[2] ^ d[1] ^ c[25] ^ c[26] ^ c[28] ^ c[29] ^ c[30] ^ c[31];
-    newcrc[7] = d[7] ^ d[5] ^ d[3] ^ d[2] ^ d[0] ^ c[24] ^ c[26] ^ c[27] ^ c[29] ^ c[31];
-    newcrc[8] = d[4] ^ d[3] ^ d[1] ^ d[0] ^ c[0] ^ c[24] ^ c[25] ^ c[27] ^ c[28];
-    newcrc[9] = d[5] ^ d[4] ^ d[2] ^ d[1] ^ c[1] ^ c[25] ^ c[26] ^ c[28] ^ c[29];
-    newcrc[10] = d[5] ^ d[3] ^ d[2] ^ d[0] ^ c[2] ^ c[24] ^ c[26] ^ c[27] ^ c[29];
-    newcrc[11] = d[4] ^ d[3] ^ d[1] ^ d[0] ^ c[3] ^ c[24] ^ c[25] ^ c[27] ^ c[28];
-    newcrc[12] = d[6] ^ d[5] ^ d[4] ^ d[2] ^ d[1] ^ d[0] ^ c[4] ^ c[24] ^ c[25] ^ c[26] ^ c[28] ^ c[29] ^ c[30];
-    newcrc[13] = d[7] ^ d[6] ^ d[5] ^ d[3] ^ d[2] ^ d[1] ^ c[5] ^ c[25] ^ c[26] ^ c[27] ^ c[29] ^ c[30] ^ c[31];
-    newcrc[14] = d[7] ^ d[6] ^ d[4] ^ d[3] ^ d[2] ^ c[6] ^ c[26] ^ c[27] ^ c[28] ^ c[30] ^ c[31];
-    newcrc[15] = d[7] ^ d[5] ^ d[4] ^ d[3] ^ c[7] ^ c[27] ^ c[28] ^ c[29] ^ c[31];
-    newcrc[16] = d[5] ^ d[4] ^ d[0] ^ c[8] ^ c[24] ^ c[28] ^ c[29];
-    newcrc[17] = d[6] ^ d[5] ^ d[1] ^ c[9] ^ c[25] ^ c[29] ^ c[30];
-    newcrc[18] = d[7] ^ d[6] ^ d[2] ^ c[10] ^ c[26] ^ c[30] ^ c[31];
-    newcrc[19] = d[7] ^ d[3] ^ c[11] ^ c[27] ^ c[31];
-    newcrc[20] = d[4] ^ c[12] ^ c[28];
-    newcrc[21] = d[5] ^ c[13] ^ c[29];
-    newcrc[22] = d[0] ^ c[14] ^ c[24];
-    newcrc[23] = d[6] ^ d[1] ^ d[0] ^ c[15] ^ c[24] ^ c[25] ^ c[30];
-    newcrc[24] = d[7] ^ d[2] ^ d[1] ^ c[16] ^ c[25] ^ c[26] ^ c[31];
-    newcrc[25] = d[3] ^ d[2] ^ c[17] ^ c[26] ^ c[27];
-    newcrc[26] = d[6] ^ d[4] ^ d[3] ^ d[0] ^ c[18] ^ c[24] ^ c[27] ^ c[28] ^ c[30];
-    newcrc[27] = d[7] ^ d[5] ^ d[4] ^ d[1] ^ c[19] ^ c[25] ^ c[28] ^ c[29] ^ c[31];
-    newcrc[28] = d[6] ^ d[5] ^ d[2] ^ c[20] ^ c[26] ^ c[29] ^ c[30];
-    newcrc[29] = d[7] ^ d[6] ^ d[3] ^ c[21] ^ c[27] ^ c[30] ^ c[31];
-    newcrc[30] = d[7] ^ d[4] ^ c[22] ^ c[28] ^ c[31];
-    newcrc[31] = d[5] ^ c[23] ^ c[29];
-    nextCRC32_D8 = newcrc;
-  end
-  endfunction
-endmodule