verilog/lm32/lm32_addsub.v

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  37 //                         FILE DETAILS
  38 // Project          : LatticeMico32
  39 // File             : lm32_addsub.v
  40 // Title            : PMI adder/subtractor.
  41 // Version          : 6.1.17
  42 //                  : Initial Release
  43 // Version          : 7.0SP2, 3.0
  44 //                  : No Change
  45 // Version          : 3.1
  46 //                  : No Change
  47 // =============================================================================
  48
  49 `include "lm32_include.v"
  50
  51 /////////////////////////////////////////////////////
  52 // Module interface
  53 /////////////////////////////////////////////////////
  54
  55 module lm32_addsub (
  56     // ----- Inputs -------
  57     DataA,
  58     DataB,
  59     Cin,
  60     Add_Sub,
  61     // ----- Outputs -------
  62     Result,
  63     Cout
  64     );
  65
  66 /////////////////////////////////////////////////////
  67 // Inputs
  68 /////////////////////////////////////////////////////
  69
  70 input [31:0] DataA;
  71 input [31:0] DataB;
  72 input Cin;
  73 input Add_Sub;
  74
  75 /////////////////////////////////////////////////////
  76 // Outputs
  77 /////////////////////////////////////////////////////
  78
  79 output [31:0] Result;
  80 wire   [31:0] Result;
  81 output Cout;
  82 wire   Cout;
  83
  84 /////////////////////////////////////////////////////
  85 // Instantiations
  86 /////////////////////////////////////////////////////
  87
  88 // Modified for Milkymist: removed non-portable instantiated block
  89              wire [32:0] tmp_addResult = DataA + DataB + Cin;
  90              wire [32:0] tmp_subResult = DataA - DataB - !Cin;
  91
  92              assign  Result = (Add_Sub == 1) ? tmp_addResult[31:0] : tmp_subResult[31:0];
  93              assign  Cout = (Add_Sub == 1) ? tmp_addResult[32] : !tmp_subResult[32];
  94
  95 endmodule