Verilog中内部和内部延迟与阻塞和NBA的混淆

Question

这是代码。

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这是对应的打印语句和波形。

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

如您所见，只有具有无阻塞分配的内部延迟才提供延迟输出，其余所有延迟/分配都提供不同的输出。

我知道内部/内部延迟之间的区别，但是似乎总是不会在替代事件上触发总是块（延迟为@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 ，如果{{1} }延迟）。但是，NBA的Intra Delay总是会被正确触发。

有人可以在这里帮助我吗？

Answer 1

$regName = $xml->xpath("//RegItem")[0]['Name']; 并不意味着执行always @(expression) statement更改的statement传送时间。这意味着等待expression进行更改，执行expression，然后重复返回以等待statement进行更改。

问题是当表达式在执行语句的过程中更改时，更改丢失。您只能等待开始后 发生的更改。

与我先前回答的this one相同。