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这是测试激励的初始化文件，红色是不明白的地方不理解，还有老师是怎么处理addr_t = addr + phase;的思路，寄存器取值的步骤是什么？

begin

  Clk = 0;
  Rst_n = 1;
  En = 0;
  phase = 0;
  #10
  Rst_n = 0;
  @(negedge Clk);  
  @(negedge Clk)
  Rst_n = 1;
  @(negedge Clk)
  Lock = 1;
  K = 1;
  @(negedge Clk)
  Lock = 0;
  @(negedge Clk)
  En = 1;
  #30000
  @(negedge Clk)
  phase = 200;
  #30000
  @(negedge Clk)
  Lock = 1;
  K = 10;
  @(negedge Clk)
  Lock = 0;
  #30000
  $stop;
endbegin
  Clk = 0;
  Rst_n = 1;
  En = 0;
  phase = 0;
  #10
  Rst_n = 0;
  @(negedge Clk);  
  @(negedge Clk)
  Rst_n = 1;
  @(negedge Clk)
  Lock = 1;
  K = 1;
  @(negedge Clk)
  Lock = 0;
  @(negedge Clk)
  En = 1;
  #30000
  @(negedge Clk)
  phase = 200;
  #30000
  @(negedge Clk)
  Lock = 1;
  K = 10;
  @(negedge Clk)
  Lock = 0;
  #30000
  $stop;
end