Verilog中阻塞和NBA的帧间和帧内延迟混淆

这是代码。

module temp();
  bit a;
  bit w_inter_nonblocking, x_inter_blocking, y_intra_blocking, z_intra_nonblocking;

  always @ (a)
  begin 
    $display("@%0t : Blocking x_inter_blocking", $time());
    #7 x_inter_blocking = a;
  end

  always @ (a)
  begin 
    $display("@%0t : Nonblocking w_inter_nonblocking", $time());
    #7 w_inter_nonblocking <= a;
  end

  always @ (a)
  begin 
    $display("@%0t : Nonblocking z_intra_nonblocking", $time());
    z_intra_nonblocking <= #7 a;
  end

  always @ (a)
  begin
    $display("@%0t : Blocking y_intra_blocking", $time());
    y_intra_blocking = #7 a;
  end

  initial
    forever #5 a = $random();

  initial 
    #150 $finish();

  // initial 
  //   #40 disable karan;

  initial 
  begin
    $dumpvars(0, temp);
    $dumpfile("temp.vcd");
  end
endmodule

下面是相应的打印语句和波形。

@10 : Nonblocking z_intra_nonblocking
@10 : Blocking x_inter_blocking
@10 : Nonblocking w_inter_nonblocking
@10 : Blocking y_intra_blocking
@40 : Nonblocking z_intra_nonblocking
@40 : Blocking x_inter_blocking
@40 : Nonblocking w_inter_nonblocking
@40 : Blocking y_intra_blocking
@45 : Nonblocking z_intra_nonblocking
@55 : Nonblocking z_intra_nonblocking
@55 : Blocking x_inter_blocking
@55 : Nonblocking w_inter_nonblocking
@55 : Blocking y_intra_blocking
@60 : Nonblocking z_intra_nonblocking
@70 : Nonblocking z_intra_nonblocking
@70 : Blocking x_inter_blocking
@70 : Nonblocking w_inter_nonblocking
@70 : Blocking y_intra_blocking
@75 : Nonblocking z_intra_nonblocking
@80 : Nonblocking z_intra_nonblocking
@80 : Blocking x_inter_blocking
@80 : Nonblocking w_inter_nonblocking
@80 : Blocking y_intra_blocking
@85 : Nonblocking z_intra_nonblocking
@90 : Nonblocking z_intra_nonblocking
@90 : Blocking x_inter_blocking
@90 : Nonblocking w_inter_nonblocking
@90 : Blocking y_intra_blocking
@95 : Nonblocking z_intra_nonblocking
@105 : Nonblocking z_intra_nonblocking
@105 : Blocking x_inter_blocking
@105 : Nonblocking w_inter_nonblocking
@105 : Blocking y_intra_blocking
@110 : Nonblocking z_intra_nonblocking
@115 : Nonblocking z_intra_nonblocking
@115 : Blocking x_inter_blocking
@115 : Nonblocking w_inter_nonblocking
@115 : Blocking y_intra_blocking
@130 : Nonblocking z_intra_nonblocking
@130 : Blocking x_inter_blocking
@130 : Nonblocking w_inter_nonblocking
@130 : Blocking y_intra_blocking
@135 : Nonblocking z_intra_nonblocking
@140 : Nonblocking z_intra_nonblocking
@140 : Blocking x_inter_blocking
@140 : Nonblocking w_inter_nonblocking
@140 : Blocking y_intra_blocking

正如您所看到的,只有具有非阻塞分配的内部延迟提供延迟输出,其余所有延迟/分配提供不同的输出。

我知道帧间/帧内延迟之间的区别,但是似乎在替代事件上不会触发always块(延迟为 #7 ,如果发生任何信号变化 < #7 延迟)。然而,NBA的内部延迟总是会被正确触发。

有人能帮我吗?