system Verilog中代码reg dat_en = 0; reg [3:0] dat_d ; reg [15:0] crc_cal [3:0]; initial begin for(int j = 0; j < 4; j++) crc_cal[j] <= 16'd0; end function automatic logic [15:0] CalcCrcDAT(input [15:0] crc, input inbit); return {crc[14:0],crc[15]^inbit} ^ {3'b0,crc[15]^inbit,6'b0,crc[15]^inbit,5'b0}; endfunction task cmd_53_wr_dat_gen; input [9:0] num; reg [7:0] wr_data; reg dat_part_select; integer k; begin /* @(negedge clk); for(int j = 0; j < 4; j++) crc_cal[j] <= 16'd0; */ @(negedge clk); dat_en <= 1'b1; dat_d <= 4'h0; wr_data<= 8'd1; dat_part_select <= 1'b0; for(int j = 0; j < 4; j++) crc_cal[j] <= CalcCrcDAT(crc_cal[j],1'b0); for (k=0;k<num * 2;k=k+1) begin @(negedge clk); dat_en <= 1'b1; dat_part_select <= ~dat_part_select; if(dat_part_select) begin dat_d <= wr_data[7:4]; for(int j = 0; j < 4; j++) crc_cal[j] <= CalcCrcDAT(crc_cal[j],wr_data[j+4]); end else begin dat_d <= wr_data[3:0]; wr_data <= wr_data + 1'b1; for(int j = 0; j < 4; j++) crc_cal[j] <= CalcCrcDAT(crc_cal[j],wr_data[j+4]); end end @(negedge clk); dat_en <= 1'b1; dat_d <= 4'hf; @(negedge clk); dat_en <= 1'b0; dat_d <= 4'hf; end endtask中为什么crc一直为为0

Verilog代码

CAN Verilog源代码

在system Verilog中function automatic logic [15:0] CalcCrcDAT(input [15:0] crc, input inbit); return {crc[14:0],crc[15]^inbit} ^ {3'b0,crc[15]^inbit,6'b0,crc[15]^inbit,5'b0}; endfunction task cmd_53_wr_dat_gen; input [9:0] num; reg [7:0] wr_data; reg dat_part_select; integer k; reg [15:0] crc [3:0]; begin @(negedge clk); dat_en <= 1'b1; dat_d <= 4'h0; wr_data<= 8'd1; dat_part_select <= 1'b0; for(int j = 0; j < 4; j++) crc[j] <= CalcCrcDAT(crc[j],1'b0); for (k=0;k<num * 2;k=k+1) begin @(negedge clk); dat_en <= 1'b1; dat_part_select <= ~dat_part_select; if(dat_part_select) begin dat_d <= wr_data[7:4]; for(int j = 0; j < 4; j++) crc[j] <= CalcCrcDAT(crc[j],wr_data[j+4]); end else begin dat_d <= wr_data[3:0]; wr_data <= wr_data + 1'b1; for(int j = 0; j < 4; j++) crc[j] <= CalcCrcDAT(crc[j],wr_data[j+4]); end end @(negedge clk); dat_en <= 1'b1; dat_d <= 4'hf; @(negedge clk); dat_en <= 1'b0; dat_d <= 4'hf; end endtask中为什么crc一直为不定态

根据代码，可以看到在task cmd_53_wr_dat_gen 中，crc 是一个数组，但是在初始化时并没有对其进行赋值。因此，最初 crc 数组的值是不确定的。在代码的循环中，使用了 CalcCrcDAT 函数对 crc 进行更新，...

解释以下代码module enable ( input de_en_out, input rst, output reg io_en1,//对应各个指示位 output reg io_en2, output reg io_en3, output reg io_en4, output reg io_en5, output reg io_en6, output reg en//使能：停止全部记数 ); reg [2:0] state; always @ (negedge de_en_out or negedge rst) begin if(!rst) state <= 3'd0; else if(state==3'd6) state <= 3'd0; else state <= state + 1'b1; end always @ (state) begin case(state) 3'd0: begin io_en1<=0; io_en2<=0; io_en3<=0; io_en4<=0; io_en5<=0; io_en6<=0; en<=0; end 3'd1: begin io_en1<=1; io_en2<=0; io_en3<=0; io_en4<=0; io_en5<=0; io_en6<=0; en<=1; end 3'd2: begin io_en1<=0; io_en2<=1; io_en3<=0; io_en4<=0; io_en5<=0; io_en6<=0; en<=1; end 3'd3: begin io_en1<=0; io_en2<=0; io_en3<=1; io_en4<=0; io_en5<=0; io_en6<=0; en<=1; end 3'd4: begin io_en1<=0; io_en2<=0; io_en3<=0; io_en4<=1; io_en5<=0; io_en6<=0; en<=1; end 3'd5: begin io_en1<=0; io_en2<=0; io_en3<=0; io_en4<=0; io_en5<=1; io_en6<=0; en<=1; end 3'd6: begin io_en1<=0; io_en2<=0; io_en3<=0; io_en4<=0; io_en5<=0; io_en6<=1; en<=1; end default:begin io_en1<=0; io_en2<=0; io_en3<=0; io_en4<=0; io_en5<=0; io_en6<=0; en<=0; end endcase end endmodule

这段代码是一个Verilog HDL语言的模块，它包含了一个状态机和一些输出端口。其中，输入端口有de_en_out和rst，输出端口有io_en1~io_en6和en。这个模块的功能是控制这些输出端口的状态，根据状态机的状态，控制相应的...

//XW_crc_p.v pragma protect begin module DW_crc_p( data_in, crc_in, crc_ok, crc_out ); parameter integer data_width = 16; parameter integer poly_size = 16; parameter integer crc_cfg = 7; parameter integer bit_order = 3; parameter integer poly_coef0 = 4129; parameter integer poly_coef1 = 0; parameter integer poly_coef2 = 0; parameter integer poly_coef3 = 0; input [data_width-1:0] data_in; input [poly_size-1:0] crc_in; output crc_ok; output [poly_size-1:0] crc_out; define DW_max_data_crc_1 (data_width>poly_size?data_width:poly_size) wire [poly_size-1:0] crc_in_inv; wire [poly_size-1:0] crc_reg; wire [poly_size-1:0] crc_out_inv; wire [poly_size-1:0] crc_chk_crc_in; reg [poly_size-1:0] crc_inv_alt; reg [poly_size-1:0] crc_polynomial; include "bit_order_crc_function.inc" include "bit_order_data_function.inc" include "calculate_crc_w_in_function.inc" include "calculate_crc_function.inc" include "calculate_crc_crc_function.inc" generate //begin genvar bit_idx; reg [63:0] crc_polynomial64; reg [15:0] coef0; reg [15:0] coef1; reg [15:0] coef2; reg [15:0] coef3; assign coef0= poly_coef0; assign coef0= poly_coef1; assign coef0= poly_coef2; assign coef0= poly_coef3; assign crc_polynomial64 = {coef3, coef2, coef1, coef0}; assign crc_pollynomial = crc_polynomial64[poly_size-1:0]; case(crc_cfg/2) 0: assign crc_inv_alt = {poly_size{1'b0}}; 1: for(bit_idx = 0; bit_idx<poly_sizel bit_idx=bit_idx+1) assign crc_inv_alt[bit_idx] = (bit_idx % 2)? 1'b0:1'b1; 2: for(bit_idx=0; bit_idx<poly_size; bit_idx=bit_idx+1) assign crc_inv_alt[bit_idx] = (bit_idx % 2)?1'b1:1'b0; 3: assign crc_inv_alt = { poly_size{1'b1}}; endcase endgenerate assign crc_in_inv = bit_order_crc(crc_in) ^ crc_inv_alt; assign crc_reg = calculate_crc(bit_order_data(data_in)); assign crc_out_inv = crc_reg; assign crc_out = bit_order_crc(crc_out_inv)^ crc_inv_alt; assign crc_chk_crc_in = calculate_crc_crc(crc_reg, crc_in_inv); assign crc_ok = (crc_chk_crc_in ==0); undef DW_max_data_crc_1 endmodule pragma protect end can you write a testbench for this piece of CRC verilog code so that this verilog file and the testbench can be used togerther by vcs to verify the correctness of this verilog file?

reg [15:0] crc_in; // Outputs wire crc_ok; wire [15:0] crc_out; // Instantiate the DUT DW_crc_p dut ( .data_in(data_in), .crc_in(crc_in), .crc_ok(crc_ok), .crc_out(crc_out) ); initial ...

assign button_flag_en = (~flag_reg2) & flag_reg1; assign uart_flag = (~recv_done_d1) & recv_done_d0; assign motor_en = (digit == digit_set);

这是一些Verilog的代码片段，它们是用来实现硬件电路的。我可以为你解释这些代码的含义。第一行代码 assign button_flag_en = (~flag_reg2) & flag_reg1; 中，~表示取反，&表示按位与运算。这行代码的含义是...

module datapath( input clk, input [7:0] input_value, output reg [2:0] count ); reg [7:0] reg_input; reg [2:0] reg_count; reg [1:0] state; always @(posedge clk) begin reg_input <= input_value; state <= 0; reg_count <= 0; case(state) 0: begin if (reg_input != 0) begin state <= 1; end end 1: begin if (reg_input[0] == 1) begin reg_count <= reg_count + 1; count <= reg_count; end reg_input <= reg_input >> 1; state <= 0; end endcase end endmodule module fsm( input clk, input [2:0] count, output reg output_value ); always @(posedge clk) begin if (count == 4) begin output_value <= 1; end else begin output_value <= 0; end end endmodule module top( input clk, input [7:0] in, output wire out ); wire [2:0] count_dp; wire outf; datapath dp( .clk(clk), .input_value(in), .count(count_dp) ); fsm fsm( .clk(clk), .count(count_dp), .output_value(outf) ); assign out = outf; endmodule这个verilog代码在综合和实现上暂时没有出现问题，但无法生成比特流，请问是哪里出了问题？如何修改？

这段代码出现问题的原因可能是综合工具优化了代码，导致某些信号被优化掉了，无法生成比特流。为了解决这个问题，可以尝试在代码中添加一些锁定信号，避免被优化掉。以下是修改后的代码，添加了一些锁定信号，以...

module smg( input clk, input rst, input [15:0] dispdata, output reg [ 7:0] seg, output reg [ 3:0] an ); reg [16:0] divclk_cnt; reg divclk; reg [3:0] disp_dat; //要显示的数据 reg [1:0] disp_bit; //要显示的位 parameter maxcnt = 16'd50000; always@(posedge clk or negedge rst) begin if(!rst) begin divclk <= 1'b0; divclk_cnt <= 17'd0; end else if(divclk_cnt == maxcnt) begin divclk <= ~divclk; divclk_cnt <= 17'd0; end else begin divclk_cnt = divclk_cnt + 1'b1; end end always@(posedge divclk or negedge rst) begin if(!rst) begin an <= 4'b0000; disp_bit <= 2'd0; end else begin disp_bit <= disp_bit + 1'b1; case(disp_bit) 2'h0: begin disp_dat <= dispdata[3:0]; an <= 4'b0001; end 2'h1: begin disp_dat <= dispdata[7:4]; an <= 4'b0010; end 2'h2: begin disp_dat <= dispdata[11:8]; an <= 4'b0100; end 2'h3: begin disp_dat <= dispdata[15:12]; an <= 4'b1000; end endcase end end always@(disp_dat) begin case(disp_dat) 4'h0: seg = 8'h3f; 4'h1: seg = 8'h06; 4'h2: seg = 8'h5b; 4'h3: seg = 8'h4f; 4'h4: seg = 8'h66; 4'h5: seg = 8'h6d; 4'h6: seg = 8'h7d; 4'h7: seg = 8'h07; 4'h8: seg = 8'h7f; 4'h9: seg = 8'h6f; 4'ha: seg = 8'h77; 4'hb: seg = 8'h7c; 4'hc: seg = 8'h39; 4'hd: seg = 8'h5e; 4'he: seg = 8'h79; 4'hf: seg = 8'h71; endcase end endmodule

这段代码是一个 Verilog HDL 语言编写的七段数码管模块，通过 clk 和 rst 时钟信号控制数码管的显示，dispdata 输入信号为要显示的数据，seg 和 an 为数码管的输出信号，disp_dat 和 disp_bit 为中间变量。...

else begin case(control_reg[14:13]) 2'b00:begin //单次立即； mode_reg <= 2'b00; period_s <= pwdata[15:0 ]; pluse_s <= pwdata[31:16]; period <= pwdata[15:0 ]; pluse <= pwdata[31:16]; select <= 0; clr_reg <= 1; end 2'b01:begin //单次延迟； period <= pwdata[15:0 ]; pluse <= pwdata[31:16]; period_s <= period; pluse_s <= pluse; if(count!=16'd0) begin select <= 1; mode_reg <= 2'b01; end else begin select <= 0; mode_reg <= 2'b00; clr_reg <= 1; end end 2'b10:begin //连续立即； mode_reg <= 2'b10; period_s <= pwdata[15:0 ]; pluse_s <= pwdata[31:16]; period <= pwdata[15:0 ]; pluse <= pwdata[31:16]; select <= 0; clr_reg <= 1; end 2'b11:begin //连续延迟； mode_reg <= 2'b11; period <= pwdata[15:0 ]; pluse <= pwdata[31:16]; period_s <= period; pluse_s <= pluse; select <= 1; end endcase end

这段代码看起来像是 Verilog HDL 的一个模块中的一个状态机。根据 control_reg 的值，它会执行不同的操作，例如设置 mode_reg 以指定操作模式，设置 period 和 pluse 以指定脉冲宽度，以及设置 select 和 clr_reg 等...

module jsq_ctrl (clk,rst_n,data,en,sum,ENA,flag_sum,led); input clk; //50mhz周期20ns input rst_n; input [3:0] data; //按键值 input en; //按键的使能信号 //1ms output reg ENA; output reg [15:0] sum;//计算结果 output reg flag_sum; //结果是否有问题信号 output reg led； reg [15:0] mima; reg [2:0] cnt; reg [2:0] wrong; reg m; //对输入的键值进行同步处理 reg en1,en2; wire flag; always @ (posedge clk ,negedge rst_n) begin if (!rst_n) begin en1 <= 1'b0; en2 <= 1'b0; end else begin en1 <= en; en2 <= en1; end end assign flag = en1 &(~en2); //检测上升沿 //计算过程的执行 reg [2:0] state; reg [23:0] a; reg [23:0] sum1; reg flag_out; reg flag_en; //不需要转化的输出数据 always @ (posedge clk,negedge rst_n) begin if (!rst_n) begin a <= 24'd0; sum1 <= 24'd0; flag_out <= 1'b0; flag_sum <= 1'b0; flag_en <= 1'b0; cnt<=0; wrong<=0; ENA<=0; led<=1; m<=0; end else if (flag) begin if (data >= 4'd0 && data <= 4'h9) begin a <= {a[19:0],data}; sum1 <= {a[19:0],data}; flag_out <= 1'b1; flag_en <= 1'b1; end else if (data == 4'ha) //清零键 begin flag_out <= 1'b1; sum1 <= 24'd0; a <= 24'h0; flag_en <= 1'b0; end else if (data == 4'hb) //=键 begin if(!m) begin mima=sum1[15:0]; sum1 <= 24'd0; a <= 24'h0; m=1; flag_en <= 1'b1; flag_out <= 1'b1; end else if(sum1[15:0]==mima) begin led<=0; a <= 24'h0; wrong<=0; flag_en <= 1'b1; flag_out <= 1'b1; sum1 <= 24'd0; end else if(mima!=sum1[15:0]) begin if(wrong<2) begin a <= 24'h0; flag_en <= 1'b1; flag_out <= 1'b1; wrong<=wrong+1; sum1 <= 24'd0; end else begin a <= 24'h0; ENA<=1; wrong<=0; flag_en <= 1'b0; sum1<=0; flag_out <= 1'b1; end end end end else begin a <= a; sum1 <= sum1; flag_out <= 1'b0; flag_sum <= 1'b0; flag_en <= flag_en; end end //输出算数结果 always @ (posedge clk,negedge rst_n) begin if (!rst_n) sum <= 24'h0; else if (flag_en) sum <= sum1; else if (flag_out) begin sum[3:0] <= sum1 % 10; sum[7:4] <= sum1 / 10 % 10; sum[11:8] <= sum1 / 100 % 10; sum[15:12] <= sum1 / 1000 % 10; ENA <= ENA; end else sum <= sum; end endmodule

reg [3:0] data; reg en; wire ENA; wire [15:0] sum; wire flag_sum; wire led; jsq_ctrl uut ( .clk(clk), .rst_n(rst_n), .data(data), .en(en), .sum(sum), .ENA(ENA), .flag_sum(flag_...

这段代码是什么作用always@(posedge pclk or negedge present ) //pwm波产生； begin if((!present) || clr_reg) begin count <= 16'd0; state_reg <= 0; mode_reg2 <= 0; count_en <= 0; pwm_out <= 0; pre_cnt <= 16'd1; end

这段代码是一个 Verilog HDL 的 always 块，用于产生 PWM 波。always 块中包含一个条件语句，当 present 信号变为低电平或 clr_reg 信号为高电平时，会对一些寄存器和计数器进行初始化。其中 count 表示 PWM 波的...

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： verilog module crc12 ( input wire [11:0] data_in, input wire clk, input wire rst_n, output wire [11:0] crc_out ); reg [11:0] crc_reg; wire [11:0] crc_...

优化这段代码module eda_led( input clk, input rst, output reg[3:0] led ); reg[3:0] shift_reg; always @(posedge clk) begin if (rst) begin shift_reg <= 4'b0001; end else begin shift_reg <= {shift_reg[2:0], shift_reg[3]}; end end assign led = shift_reg; endmodule

reg [3:0] shift_reg; always @(posedge clk) begin if (rst) begin shift_reg <= 4'b0001; end else begin shift_reg <= {shift_reg[2:0], shift_reg[3]}; end end always @* begin led <= shift_reg; end ...

请补全这段代码MODULE EDA_LED( INPUT CLK, INPUT RST, OUTPUT REG[3:0] LED ); REG[3:0] SHIFT_REG; ALWAYS @(POSEDGE CLK) BEGIN IF (RST) BEGIN SHIFT_REG <= 4'B0001; END ELSE BEGIN SHIFT_REG <= {SHIFT_REG[2:0], SHIFT_REG[3]}; END END ASSIGN LED = SHIFT_REG; ENDMODULE

reg [3:0] shift_reg; always @(posedge clk) begin if (rst) begin shift_reg <= 4'b0001; end else begin shift_reg <= {shift_reg[2:0], shift_reg[3]}; end end assign led = shift_reg; endmodule ...

verilog语言解释shift_rx_reg[rx_bit_cnt] <= rx_dat_d2

在Verilog语言中，shift_rx_reg[rx_bit_cnt] <= rx_dat_d2是一个赋值语句，用于将rx_dat_d2的值赋给shift_rx_reg数组的索引为rx_bit_cnt的位置。这个语句的含义是将rx_dat_d2的值存储在shift_rx_reg数组...

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assign button_flag_en = (~flag_reg2) & flag_reg1; assign uart_flag = (~recv_done_d1) & recv_done_d0; assign motor_en = (digit == digit_set);

这段代码是什么作用always@(posedge pclk or negedge present ) //pwm波产生； begin if((!present) || clr_reg) begin count <= 16'd0; state_reg <= 0; mode_reg2 <= 0; count_en <= 0; pwm_out <= 0; pre_cnt <= 16'd1; end

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优化这段代码module eda_led( input clk, input rst, output reg[3:0] led ); reg[3:0] shift_reg; always @(posedge clk) begin if (rst) begin shift_reg <= 4'b0001; end else begin shift_reg <= {shift_reg[2:0], shift_reg[3]}; end end assign led = shift_reg; endmodule

请补全这段代码MODULE EDA_LED( INPUT CLK, INPUT RST, OUTPUT REG[3:0] LED ); REG[3:0] SHIFT_REG; ALWAYS @(POSEDGE CLK) BEGIN IF (RST) BEGIN SHIFT_REG <= 4'B0001; END ELSE BEGIN SHIFT_REG <= {SHIFT_REG[2:0], SHIFT_REG[3]}; END END ASSIGN LED = SHIFT_REG; ENDMODULE

verilog语言解释shift_rx_reg[rx_bit_cnt] <= rx_dat_d2

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