Generator Modülü

Gün 6: Bitirme Projesi - Bölüm 1 | Rastgele ve yönlendirilmiş test üretici

Kaynak Kod

// =============================================================================
// GUN 6 - Konu 3: Generator - Rastgele Uyarici Uretici
// =============================================================================

class ALU_Generator;
  mailbox #(ALU_Transaction) gen2drv;
  int num_transactions;
  event done;

  function new(mailbox #(ALU_Transaction) mbx, int num = 100);
    this.gen2drv = mbx;
    this.num_transactions = num;
  endfunction

  // Base run task must be virtual to be overridden
  virtual task run();
    ALU_Transaction txn;
    $display("[Generator] Random tests starting...");
    for (int i = 0; i < num_transactions; i++) begin
      txn = new();
      assert(txn.randomize()) else $fatal(1, "Randomize Error!");
      gen2drv.put(txn);
    end
    -> done;
  endtask
endclass

// Derived generator for corner cases
class ALU_Corner_Generator extends ALU_Generator;
  
  function new(mailbox #(ALU_Transaction) mbx, int num = 100);
    super.new(mbx, num);
  endfunction

  virtual task run();
    ALU_Transaction txn;
    logic [7:0] corners [] = '{0, 1, 8'h7F, 8'h80, 8'hFE, 8'hFF};
    
    $display("[Corner_Generator] Corner cases starting...");
    foreach (corners[i]) begin
      foreach (corners[j]) begin
        for (int op = 0; op < 8; op++) begin
          
          // Skip invalid shift operations where operand_b is greater than 7
          // to prevent constraint solver conflicts with c_shift_range
          if ((op == ALU_Transaction::OP_SHL || op == ALU_Transaction::OP_SHR) && corners[j] > 7) begin
            continue;
          end

          txn = new();
          assert(txn.randomize() with {
            operand_a == corners[i];
            operand_b == corners[j];
            opcode    == ALU_Transaction::opcode_e'(op);
          }) else $fatal(1, "Randomize Error!");
          
          gen2drv.put(txn);
        end
      end
    end
    -> done;
  endtask
endclass