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| author | jcorgan | 2008-09-08 01:00:12 +0000 |
|---|---|---|
| committer | jcorgan | 2008-09-08 01:00:12 +0000 |
| commit | e0fcbaee124d3e8c4c11bdda662f88e082352058 (patch) | |
| tree | a51ef1c8b949681f45e5664478e8515065cfff5b /usrp2/fpga/eth/rtl/verilog/MAC_rx/CRC_chk.v | |
| parent | c86f6c23c6883f73d953d64c28ab42cedb77e4d7 (diff) | |
| download | gnuradio-e0fcbaee124d3e8c4c11bdda662f88e082352058.tar.gz gnuradio-e0fcbaee124d3e8c4c11bdda662f88e082352058.tar.bz2 gnuradio-e0fcbaee124d3e8c4c11bdda662f88e082352058.zip | |
Merged r9433:9527 from features/gr-usrp2 into trunk. Adds usrp2 and gr-usrp2 top-level components. Trunk passes distcheck with mb-gcc installed, but currently not without them. The key issue is that when mb-gcc is not installed, the build system skips over the usrp2/firmware directory, and the firmware include files don't get put into the dist tarball. But we can't do the usual DIST_SUBDIRS method as the firmware is a subpackage.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@9528 221aa14e-8319-0410-a670-987f0aec2ac5
Diffstat (limited to 'usrp2/fpga/eth/rtl/verilog/MAC_rx/CRC_chk.v')
| -rw-r--r-- | usrp2/fpga/eth/rtl/verilog/MAC_rx/CRC_chk.v | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/usrp2/fpga/eth/rtl/verilog/MAC_rx/CRC_chk.v b/usrp2/fpga/eth/rtl/verilog/MAC_rx/CRC_chk.v new file mode 100644 index 000000000..d6bb22b51 --- /dev/null +++ b/usrp2/fpga/eth/rtl/verilog/MAC_rx/CRC_chk.v @@ -0,0 +1,128 @@ +//////////////////////////////////////////////////////////////////////
+//// ////
+//// CRC_chk.v ////
+//// ////
+//// This file is part of the Ethernet IP core project ////
+//// http://www.opencores.org/projects.cgi/web/ethernet_tri_mode/////
+//// ////
+//// Author(s): ////
+//// - Jon Gao (gaojon@yahoo.com) ////
+//// ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// Copyright (C) 2001 Authors ////
+//// ////
+//// 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 free software; you can redistribute it ////
+//// and/or modify it under the terms of the GNU Lesser General ////
+//// Public License as published by the Free Software Foundation; ////
+//// either version 2.1 of the License, or (at your option) any ////
+//// later version. ////
+//// ////
+//// This source is distributed in the hope that it will be ////
+//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
+//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
+//// PURPOSE. See the GNU Lesser General Public License for more ////
+//// details. ////
+//// ////
+//// You should have received a copy of the GNU Lesser General ////
+//// Public License along with this source; if not, download it ////
+//// from http://www.opencores.org/lgpl.shtml ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//
+// CVS Revision History
+//
+// $Log: CRC_chk.v,v $
+// Revision 1.3 2006/01/19 14:07:54 maverickist
+// verification is complete.
+//
+// Revision 1.2 2005/12/16 06:44:16 Administrator
+// replaced tab with space.
+// passed 9.6k length frame test.
+//
+// Revision 1.1.1.1 2005/12/13 01:51:45 Administrator
+// no message
+//
+
+module CRC_chk(
+Reset ,
+Clk ,
+CRC_data ,
+CRC_init ,
+CRC_en ,
+//From CPU
+CRC_chk_en ,
+CRC_err
+);
+input Reset ;
+input Clk ;
+input[7:0] CRC_data ;
+input CRC_init ;
+input CRC_en ;
+ //From CPU
+input CRC_chk_en ;
+output CRC_err ;
+//******************************************************************************
+//internal signals
+//******************************************************************************
+reg [31:0] CRC_reg;
+//******************************************************************************
+//input data width is 8bit, and the first bit is bit[0]
+function[31:0] NextCRC;
+ input[7:0] D;
+ input[31:0] C;
+ reg[31:0] NewCRC;
+ begin
+ NewCRC[0]=C[24]^C[30]^D[1]^D[7];
+ NewCRC[1]=C[25]^C[31]^D[0]^D[6]^C[24]^C[30]^D[1]^D[7];
+ NewCRC[2]=C[26]^D[5]^C[25]^C[31]^D[0]^D[6]^C[24]^C[30]^D[1]^D[7];
+ NewCRC[3]=C[27]^D[4]^C[26]^D[5]^C[25]^C[31]^D[0]^D[6];
+ NewCRC[4]=C[28]^D[3]^C[27]^D[4]^C[26]^D[5]^C[24]^C[30]^D[1]^D[7];
+ NewCRC[5]=C[29]^D[2]^C[28]^D[3]^C[27]^D[4]^C[25]^C[31]^D[0]^D[6]^C[24]^C[30]^D[1]^D[7];
+ NewCRC[6]=C[30]^D[1]^C[29]^D[2]^C[28]^D[3]^C[26]^D[5]^C[25]^C[31]^D[0]^D[6];
+ NewCRC[7]=C[31]^D[0]^C[29]^D[2]^C[27]^D[4]^C[26]^D[5]^C[24]^D[7];
+ NewCRC[8]=C[0]^C[28]^D[3]^C[27]^D[4]^C[25]^D[6]^C[24]^D[7];
+ NewCRC[9]=C[1]^C[29]^D[2]^C[28]^D[3]^C[26]^D[5]^C[25]^D[6];
+ NewCRC[10]=C[2]^C[29]^D[2]^C[27]^D[4]^C[26]^D[5]^C[24]^D[7];
+ NewCRC[11]=C[3]^C[28]^D[3]^C[27]^D[4]^C[25]^D[6]^C[24]^D[7];
+ NewCRC[12]=C[4]^C[29]^D[2]^C[28]^D[3]^C[26]^D[5]^C[25]^D[6]^C[24]^C[30]^D[1]^D[7];
+ NewCRC[13]=C[5]^C[30]^D[1]^C[29]^D[2]^C[27]^D[4]^C[26]^D[5]^C[25]^C[31]^D[0]^D[6];
+ NewCRC[14]=C[6]^C[31]^D[0]^C[30]^D[1]^C[28]^D[3]^C[27]^D[4]^C[26]^D[5];
+ NewCRC[15]=C[7]^C[31]^D[0]^C[29]^D[2]^C[28]^D[3]^C[27]^D[4];
+ NewCRC[16]=C[8]^C[29]^D[2]^C[28]^D[3]^C[24]^D[7];
+ NewCRC[17]=C[9]^C[30]^D[1]^C[29]^D[2]^C[25]^D[6];
+ NewCRC[18]=C[10]^C[31]^D[0]^C[30]^D[1]^C[26]^D[5];
+ NewCRC[19]=C[11]^C[31]^D[0]^C[27]^D[4];
+ NewCRC[20]=C[12]^C[28]^D[3];
+ NewCRC[21]=C[13]^C[29]^D[2];
+ NewCRC[22]=C[14]^C[24]^D[7];
+ NewCRC[23]=C[15]^C[25]^D[6]^C[24]^C[30]^D[1]^D[7];
+ NewCRC[24]=C[16]^C[26]^D[5]^C[25]^C[31]^D[0]^D[6];
+ NewCRC[25]=C[17]^C[27]^D[4]^C[26]^D[5];
+ NewCRC[26]=C[18]^C[28]^D[3]^C[27]^D[4]^C[24]^C[30]^D[1]^D[7];
+ NewCRC[27]=C[19]^C[29]^D[2]^C[28]^D[3]^C[25]^C[31]^D[0]^D[6];
+ NewCRC[28]=C[20]^C[30]^D[1]^C[29]^D[2]^C[26]^D[5];
+ NewCRC[29]=C[21]^C[31]^D[0]^C[30]^D[1]^C[27]^D[4];
+ NewCRC[30]=C[22]^C[31]^D[0]^C[28]^D[3];
+ NewCRC[31]=C[23]^C[29]^D[2];
+ NextCRC=NewCRC;
+ end
+ endfunction
+
+always @ (posedge Clk or posedge Reset)
+ if (Reset)
+ CRC_reg <=32'hffffffff;
+ else if (CRC_init)
+ CRC_reg <=32'hffffffff;
+ else if (CRC_en)
+ CRC_reg <=NextCRC(CRC_data,CRC_reg);
+
+assign CRC_err = CRC_chk_en&(CRC_reg[31:0] != 32'hc704dd7b);
+
+endmodule
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