//时计数器---十位(0~2) always @(posedge clk or negedge rst_n) begin if (!rst_n) begin set_cnt_h_ten<=0; end else if (add_set_cnt_h_ten) begin if (end_set_cnt_h_ten) begin set_cnt_h_ten<=0; end else set_cnt_h_ten<=set_cnt_h_ten+1; end else if (add_set_cnt_h_ten1) begin if (end_set_cnt_h_ten1) begin set_cnt_h_ten<=set_cnt_flag1; end else set_cnt_h_ten<=set_cnt_h_ten-1; end end assign add_set_cnt_h_ten=state_c==SET_TIME&&select_seg==6'b100_000&&key_done[3]; assign end_set_cnt_h_ten=add_set_cnt_h_ten&&set_cnt_h_ten==set_cnt_flag1||idel_TO_set_time; assign add_set_cnt_h_ten1=state_c==SET_TIME&&select_seg==6'b100_000&&key_done[1]; assign end_set_cnt_h_ten1=add_set_cnt_h_ten1&&set_cnt_h_ten==0 ||idel_TO_set_time;

这段代码是一个时计数器的 Verilog 实现，其中 set_cnt_h_ten 表示小时计时器的十位数。时钟信号为 posedge 时钟或 negedge 复位信号。如果复位信号为低电平，计数器的当前值会被清零。当 add_set_cnt_h_ten 信号满足条件时，计数器会自增 1，直到 end_set_cnt_h_ten 信号满足条件时停止自增。同理，当 add_set_cnt_h_ten1 信号满足条件时，计数器会自减 1，直到 end_set_cnt_h_ten1 信号满足条件时停止自减。其中 set_cnt_flag1 表示计数器设置的目标值，idel_TO_set_time 表示是否进入设置时间的空闲状态。

相关问题

always @(posedge clk or negedge rst_n) if(rst_n) clk_1 <= 1'b0; else clk_1 <= clk_0; always @(posedge clk or negedge rst_n) if(rst_n) clk_2 <= 1'b0; else clk_2 <= clk_1; always @(posedge clk or negedge rst_n) if(rst_n) clk_3 <= 1'b0; else clk_3 <= clk_2;

这段代码展示了三个时钟信号（clk_1, clk_2, clk_3）的递推关系。当复位信号 rst_n 为高电平时，所有时钟信号都被重置为低电平。否则，每个时钟信号都是前一个时钟信号的延迟版本。也就是说，clk_1 是 clk_0 的延迟版本，clk_2 是 clk_1 的延迟版本，以此类推。这种递推关系可以用于时钟延迟和同步电路设计中。请问有什么问题我可以帮助您解答的吗？

module crc8( data_in, clk, rst_n, crc7, crc6, crc5, crc4, crc3, crc2, crc1, crc0 ); input wire data_in; input wire clk; input wire rst_n; output wire crc7; output wire crc6; output wire crc5; output wire crc4; output wire crc3; output wire crc2; output wire crc1; output wire crc0; wire SYNTHESIZED_WIRE_5; reg DFF_inst8; reg DFF_inst; wire SYNTHESIZED_WIRE_2; wire SYNTHESIZED_WIRE_3; reg DFF_inst3; reg DFF_inst4; reg DFF_inst5; reg DFF_inst6; reg DFF_inst7; reg DFF_inst2; assign crc7 = DFF_inst8; assign crc6 = DFF_inst7; assign crc5 = DFF_inst6; assign crc4 = DFF_inst5; assign crc3 = DFF_inst4; assign crc2 = DFF_inst3; assign crc1 = DFF_inst2; assign crc0 = DFF_inst; always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst <= 1; end else begin DFF_inst <= SYNTHESIZED_WIRE_5; end end assign SYNTHESIZED_WIRE_5 = data_in ^ DFF_inst8; assign SYNTHESIZED_WIRE_2 = SYNTHESIZED_WIRE_5 ^ DFF_inst; always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst2 <= 1; end else begin DFF_inst2 <= SYNTHESIZED_WIRE_2; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst3 <= 1; end else begin DFF_inst3 <= SYNTHESIZED_WIRE_3; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst4 <= 1; end else begin DFF_inst4 <= DFF_inst3; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst5 <= 1; end else begin DFF_inst5 <= DFF_inst4; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst6 <= 1; end else begin DFF_inst6 <= DFF_inst5; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst7 <= 1; end else begin DFF_inst7 <= DFF_inst6; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst8 <= 1; end else begin DFF_inst8 <= DFF_inst7; end end assign SYNTHESIZED_WIRE_3 = SYNTHESIZED_WIRE_5 ^ DFF_inst2; endmodule 把这个代码修改成CRC-12编码器

好的，这里是修改后的CRC-12编码器代码，其中使用的CRC多项式为x^12 + x^11 + x^3 + x^2 + x + 1：

module crc12(
  data_in,
  clk,
  rst_n,
  crc11,
  crc10,
  crc9,
  crc8,
  crc7,
  crc6,
  crc5,
  crc4,
  crc3,
  crc2,
  crc1,
  crc0
);

  input wire data_in;
  input wire clk;
  input wire rst_n;
  output wire crc11;
  output wire crc10;
  output wire crc9;
  output wire crc8;
  output wire crc7;
  output wire crc6;
  output wire crc5;
  output wire crc4;
  output wire crc3;
  output wire crc2;
  output wire crc1;
  output wire crc0;

  wire [11:0] crc;
  wire [11:0] crc_next;
  wire [11:0] data;

  assign data = {data_in, 6'b0};

  always@(posedge clk or negedge rst_n) begin
    if (!rst_n) begin
      crc <= 12'hFFF;
    end
    else begin
      crc <= crc_next;
    end
  end

  assign crc11 = crc[11];
  assign crc10 = crc[10];
  assign crc9 = crc[9];
  assign crc8 = crc[8];
  assign crc7 = crc[7];
  assign crc6 = crc[6];
  assign crc5 = crc[5];
  assign crc4 = crc[4];
  assign crc3 = crc[3];
  assign crc2 = crc[2];
  assign crc1 = crc[1];
  assign crc0 = crc[0];

  assign crc_next[11:0] = {crc[10:0], 1'b0} ^ (data << 4) ^ (data << 1) ^ data;
  
endmodule

这个代码使用了一个12位的寄存器crc来保存当前的CRC校验值，每次输入一个数据位时，根据CRC多项式进行异或运算得到下一个CRC值，并将其保存到crc_next中。在时钟上升沿时，将crc_next的值赋给crc寄存器，完成一次CRC计算。最后，根据CRC校验位的位置将crc寄存器的值输出到crc11到crc0中，即可得到CRC-12校验码。