Moved usrp1 fpga files into usrp1 subdir.

1 files changed, 109 insertions, 0 deletions

diff --git a/usrp1/sdr_lib/cordic.v b/usrp1/sdr_lib/cordic.v
new file mode 100755
index 000000000..ea4119426
--- /dev/null
+++ b/usrp1/sdr_lib/cordic.v
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+// -*- verilog -*-
+//
+//  USRP - Universal Software Radio Peripheral
+//
+//  Copyright (C) 2003 Matt Ettus
+//
+//  This program is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation; either version 2 of the License, or
+//  (at your option) any later version.
+//
+//  This program 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 General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 51 Franklin Street, Boston, MA  02110-1301  USA
+//
+
+module cordic(clock, reset, enable, xi, yi, zi, xo, yo, zo );
+   parameter bitwidth = 16;
+   parameter zwidth = 16;
+   
+   input clock;
+   input reset;
+   input enable;
+   input [bitwidth-1:0] xi, yi;
+   output [bitwidth-1:0] xo, yo;
+   input [zwidth-1:0] zi;
+   output [zwidth-1:0] zo;
+   
+   reg [bitwidth+1:0] 	 x0,y0;
+   reg [zwidth-2:0] 	 z0;
+   wire [bitwidth+1:0] 	 x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12;
+   wire [bitwidth+1:0] 	 y1,y2,y3,y4,y5,y6,y7,y8,y9,y10,y11,y12;
+   wire [zwidth-2:0] z1,z2,z3,z4,z5,z6,z7,z8,z9,z10,z11,z12;
+   
+   wire [bitwidth+1:0] xi_ext = {{2{xi[bitwidth-1]}},xi};
+   wire [bitwidth+1:0] yi_ext = {{2{yi[bitwidth-1]}},yi};
+
+   // Compute consts.  Would be easier if vlog had atan...
+   // see gen_cordic_consts.py
+   
+`define c00 16'd8192
+`define c01 16'd4836
+`define c02 16'd2555
+`define c03 16'd1297
+`define c04 16'd651
+`define c05 16'd326
+`define c06 16'd163
+`define c07 16'd81
+`define c08 16'd41
+`define c09 16'd20
+`define c10 16'd10
+`define c11 16'd5
+`define c12 16'd3
+`define c13 16'd1
+`define c14 16'd1
+`define c15 16'd0
+`define c16 16'd0
+
+   always @(posedge clock)
+     if(reset)
+       begin
+	  x0   <= #1 0; y0   <= #1 0;  z0   <= #1 0;
+       end
+     else if(enable)
+       begin
+	  z0 <= #1 zi[zwidth-2:0];
+	  case (zi[zwidth-1:zwidth-2])
+	    2'b00, 2'b11 : 
+	      begin
+		 x0 <= #1 xi_ext;
+		 y0 <= #1 yi_ext;
+	      end
+	    2'b01, 2'b10 :
+	      begin
+		 x0 <= #1 -xi_ext;
+		 y0 <= #1 -yi_ext;
+	      end
+	  endcase // case(zi[zwidth-1:zwidth-2])
+       end // else: !if(reset)
+   
+   // FIXME need to handle variable number of stages
+   // FIXME should be able to narrow zwidth but quartus makes it bigger...
+   // This would be easier if arrays worked better in vlog...
+   cordic_stage #(bitwidth+2,zwidth-1,0) cordic_stage0 (clock,reset,enable,x0,y0,z0,`c00,x1,y1,z1);
+   cordic_stage #(bitwidth+2,zwidth-1,1) cordic_stage1 (clock,reset,enable,x1,y1,z1,`c01,x2,y2,z2);
+   cordic_stage #(bitwidth+2,zwidth-1,2) cordic_stage2 (clock,reset,enable,x2,y2,z2,`c02,x3,y3,z3);
+   cordic_stage #(bitwidth+2,zwidth-1,3) cordic_stage3 (clock,reset,enable,x3,y3,z3,`c03,x4,y4,z4);
+   cordic_stage #(bitwidth+2,zwidth-1,4) cordic_stage4 (clock,reset,enable,x4,y4,z4,`c04,x5,y5,z5);
+   cordic_stage #(bitwidth+2,zwidth-1,5) cordic_stage5 (clock,reset,enable,x5,y5,z5,`c05,x6,y6,z6);
+   cordic_stage #(bitwidth+2,zwidth-1,6) cordic_stage6 (clock,reset,enable,x6,y6,z6,`c06,x7,y7,z7);
+   cordic_stage #(bitwidth+2,zwidth-1,7) cordic_stage7 (clock,reset,enable,x7,y7,z7,`c07,x8,y8,z8);
+   cordic_stage #(bitwidth+2,zwidth-1,8) cordic_stage8 (clock,reset,enable,x8,y8,z8,`c08,x9,y9,z9);
+   cordic_stage #(bitwidth+2,zwidth-1,9) cordic_stage9 (clock,reset,enable,x9,y9,z9,`c09,x10,y10,z10);
+   cordic_stage #(bitwidth+2,zwidth-1,10) cordic_stage10 (clock,reset,enable,x10,y10,z10,`c10,x11,y11,z11);
+   cordic_stage #(bitwidth+2,zwidth-1,11) cordic_stage11 (clock,reset,enable,x11,y11,z11,`c11,x12,y12,z12);
+
+   assign xo = x12[bitwidth:1];  
+   assign yo = y12[bitwidth:1];
+   //assign xo = x12[bitwidth+1:2];  // CORDIC gain is ~1.6, plus gain from rotating vectors
+   //assign yo = y12[bitwidth+1:2];
+   assign zo = z12;		  
+
+endmodule // cordic
+