Question

我正在编写一个代码，其中基于输入条件唤起某些序列检测器模块，并根据它们各自的输出来设置最终系统输出。

我尝试了赋值运算符，但我认为它是错误的。
我尝试使用输出reg等更改标识符。
我在同一行中使用<=。
我总是对整个代码进行阻塞。
****

行中的错误

module direction_detection(event1,event2,uni_or_bi_in,event_in,timer_in,
     clk,rst,axel_detect,direction_up,direction_down,axel_count);

  input  event1,event2,event_in,uni_or_bi_in,timer_in,clk,rst;
  output direction_up ,direction_down,axel_count;
  output reg axel_detect;

  reg ticker_ON,ticker_up,event1_pulse,event2_pulse,event1_pcounter,event2_pcounter;
  wire concat_events;
  wire reset,axel_sq_out;

  always @ ( posedge clk)
    begin 
      if(rst==1'b1)
        begin
          direction_up <= 0'b0;
          direction_down <= 0'b0;
          axel_count <= 0'b0;
          axel_detect <= 0'b0;
          reset <= 1'b1;
        end 
    end

  timer_delay t1(timer_in,clk,reset,ticker_up);
  pulse_detector p1 (event1,clk,event1_pulse,event1_pcounter);
  pulse_detector p2 (event2,clk,event2_pulse,event2_pcounter);

  assign concat_events = {event1_pulse,event2_pulse};

  if ( uni_or_bi_in ==1'b1)
    begin 
      sequence_detector_uniD sdu1( rst,clk,concat_events,axel_sq_out,direction_up,direction_down );
      if (axel_sq_out==1'b1 && (direction_up==1'b1 || direction_down==1'b1))
        begin
          axel_count=axel_count+1; //****
          reset =  (direction_up || direction_down);
        end
      else
        begin
          reset =~(direction_up || direction_down);  // ****
        end
    end
  else 
    begin
      sequence_detector_biD sdb1( rst,clk,event_in,event1_pulse,event2_pulse,axel_detect );
      if (axel_detect ==1'b1)
        begin
          axel_count=axel_count+1; // ****
          reset=1'b1;
        end
      else
        begin
           reset=1'b0; // ****
        end
    end

endmodule

Answer 1

您不能像这样有条件地调用模块，也不能在不是generate语句的if-else块中实例化模块。您必须实例化所有模块，然后有条件地使用它们的输出。

您可以尝试以下类似方法，至少可以编译，但是可能还需要解决其他问题。

module direction_detection(
        event1,event2,uni_or_bi_in,event_in,timer_in,
        clk,rst,axel_detect,direction_up,direction_down,axel_count);

    input  event1,event2,event_in,uni_or_bi_in,timer_in,clk,rst;
    output reg direction_up ,direction_down,axel_count;
    output reg axel_detect;

    reg  ticker_ON,ticker_up,event1_pulse,event2_pulse,
         event1_pcounter,event2_pcounter;
    wire concat_events;
    reg  reset,axel_sq_out;

    timer_delay t1(timer_in,clk,reset,ticker_up);

    pulse_detector p1 (
        event1,clk,event1_pulse,event1_pcounter);

    pulse_detector p2 (
        event2,clk,event2_pulse,event2_pcounter);

    sequence_detector_uniD sdu1(
        rst,clk,concat_events,axel_sq_out,direction_up,direction_down);

    sequence_detector_biD sdb1(
        rst,clk,event_in,event1_pulse,event2_pulse,axel_detect);

    always @(posedge clk)
    begin
        if(rst==1'b1)
        begin
            direction_up <= 0'b0;
            direction_down <= 0'b0;
            axel_count <= 0'b0;
            axel_detect <= 0'b0;
            reset <= 1'b1;
        end else begin
            if (uni_or_bi_in==1'b1)
            begin
                if (axel_sq_out==1'b1 && (direction_up==1'b1 || direction_down==1'b1))
                begin
                    axel_count <= axel_count+1;
                    reset <=  (direction_up || direction_down);
                end
                else
                begin
                    reset <= ~(direction_up || direction_down);
                end
            end
            else
            begin
                if (axel_detect==1'b1)
                begin
                    axel_count <= axel_count+1;
                    reset <= 1'b1;
                end
                else
                begin
                    reset <= 1'b0;
                end
            end
        end
    end

    assign concat_events = {event1_pulse,event2_pulse};

endmodule

在“ =”附近：语法错误，意外的'='，第36、41、50、55行需要IDENTIFIER或TYPE_IDENTIFIER

1 个答案: