IPCores/lm32_cpu / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/lm32_addsub.v	Sun Apr 04 20:40:03 2010 +0100
     1.3 @@ -0,0 +1,93 @@
     1.4 +// =============================================================================
     1.5 +//                           COPYRIGHT NOTICE
     1.6 +// Copyright 2006 (c) Lattice Semiconductor Corporation
     1.7 +// ALL RIGHTS RESERVED
     1.8 +// This confidential and proprietary software may be used only as authorised by
     1.9 +// a licensing agreement from Lattice Semiconductor Corporation.
    1.10 +// The entire notice above must be reproduced on all authorized copies and
    1.11 +// copies may only be made to the extent permitted by a licensing agreement from
    1.12 +// Lattice Semiconductor Corporation.
    1.13 +//
    1.14 +// Lattice Semiconductor Corporation        TEL : 1-800-Lattice (USA and Canada)
    1.15 +// 5555 NE Moore Court                            408-826-6000 (other locations)
    1.16 +// Hillsboro, OR 97124                     web  : http://www.latticesemi.com/
    1.17 +// U.S.A                                   email: techsupport@latticesemi.com
    1.18 +// =============================================================================/
    1.19 +//                         FILE DETAILS
    1.20 +// Project          : LatticeMico32
    1.21 +// File             : lm32_addsub.v
    1.22 +// Title            : PMI adder/subtractor.
    1.23 +// Version          : 6.1.17
    1.24 +//                  : Initial Release
    1.25 +// Version          : 7.0SP2, 3.0
    1.26 +//                  : No Change
    1.27 +// Version          : 3.1
    1.28 +//                  : No Change
    1.29 +// =============================================================================
    1.30 +
    1.31 +`include "lm32_include.v"
    1.32 +
    1.33 +/////////////////////////////////////////////////////
    1.34 +// Module interface
    1.35 +/////////////////////////////////////////////////////
    1.36 +
    1.37 +module lm32_addsub (
    1.38 +    // ----- Inputs -------
    1.39 +    DataA, 
    1.40 +    DataB, 
    1.41 +    Cin, 
    1.42 +    Add_Sub, 
    1.43 +    // ----- Outputs -------
    1.44 +    Result, 
    1.45 +    Cout
    1.46 +    );
    1.47 +
    1.48 +/////////////////////////////////////////////////////
    1.49 +// Inputs
    1.50 +/////////////////////////////////////////////////////
    1.51 +
    1.52 +input [31:0] DataA;
    1.53 +input [31:0] DataB;
    1.54 +input Cin;
    1.55 +input Add_Sub;
    1.56 +
    1.57 +/////////////////////////////////////////////////////
    1.58 +// Outputs
    1.59 +/////////////////////////////////////////////////////
    1.60 +
    1.61 +output [31:0] Result;
    1.62 +wire   [31:0] Result;
    1.63 +output Cout;
    1.64 +wire   Cout;
    1.65 +
    1.66 +/////////////////////////////////////////////////////
    1.67 +// Instantiations
    1.68 +///////////////////////////////////////////////////// 
    1.69 +
    1.70 +       generate
    1.71 +	  if (`LATTICE_FAMILY == "SC" || `LATTICE_FAMILY == "SCM") begin
    1.72 +	     wire [32:0] tmp_addResult = DataA + DataB + Cin;
    1.73 +	     wire [32:0] tmp_subResult = DataA - DataB - !Cin;   
    1.74 +   
    1.75 +	     assign  Result = (Add_Sub == 1) ? tmp_addResult[31:0] : tmp_subResult[31:0];
    1.76 +	     assign  Cout = (Add_Sub == 1) ? tmp_addResult[32] : !tmp_subResult[32];
    1.77 +	  end else begin
    1.78 +	    pmi_addsub #(// ----- Parameters -------
    1.79 +			 .pmi_data_width     (32),
    1.80 +			 .pmi_result_width   (32),
    1.81 +			 .pmi_sign           ("off"),
    1.82 +			 .pmi_family         (`LATTICE_FAMILY),
    1.83 +			 .module_type        ("pmi_addsub")) 
    1.84 +	      addsub    (// ----- Inputs -------
    1.85 +			 .DataA              (DataA),
    1.86 +			 .DataB              (DataB),
    1.87 +			 .Cin                (Cin),
    1.88 +			 .Add_Sub            (Add_Sub),
    1.89 +			 // ----- Outputs -------
    1.90 +			 .Result             (Result),
    1.91 +			 .Cout               (Cout),
    1.92 +			 .Overflow           ());
    1.93 +	  end
    1.94 +       endgenerate 
    1.95 +
    1.96 +endmodule