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【FPGA学习笔记】VL26 含有无关项的序列检测

作者:互联网

描述

请编写一个序列检测模块,检测输入信号a是否满足011XXX110序列(长度为9位数据,前三位是011,后三位是110,中间三位不做要求),当信号满足该序列,给出指示信号match。

程序的接口信号图如下:

 

 

程序的功能时序图如下:


请使用Verilog HDL实现以上功能,并编写testbench验证模块的功能。 要求代码简洁,功能完整。

 

输入描述:

clk:系统时钟信号 rst_n:异步复位信号,低电平有效 a:单比特信号,待检测的数据  

输出描述:

match:当输入信号a满足目标序列,该信号为1,其余时刻该信号为0     答:

移位寄存器

 
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 module sequence_detect(     input clk,     input rst_n,     input a,     output reg match     );     reg [8:0] a_r;           always@(posedge clk or negedge rst_n) begin         if(~rst_n)             match <= 1'b0;         else             match <= (a_r[2:0] == 3'b110) && (a_r[8:6] == 3'b011);     end           always@(posedge clk or negedge rst_n) begin         if(~rst_n)             a_r <= 9'b0;         else             a_r <= {a_r[7:0], a};     end endmodule

状态机

 
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 module sequence_detect(     input clk,     input rst_n,     input a,     output reg match );     parameter ZERO=0, ONE=1, TWO=2, THREE=3, FOUR=4, FIVE=5, SIX=6, SEVEN=7, EIGHT=8, NINE=9;     reg [3:0] state, nstate;           always@(posedge clk or negedge rst_n) begin         if(~rst_n)             state <= ZERO;         else             state <= nstate;     end           always@(*) begin         case(state)             ZERO   : nstate = a? ZERO : ONE;             ONE    : nstate = a? TWO  : ONE;             TWO    : nstate = a? THREE: ONE;             THREE  : nstate = FOUR;             FOUR   : nstate = FIVE;             FIVE   : nstate = SIX;             SIX    : nstate = a? SEVEN: ONE;             SEVEN  : nstate = a? EIGHT: ONE;             EIGHT  : nstate = a? ZERO: NINE;             NINE   : nstate = a? TWO  : ONE;             default: nstate = ZERO;         endcase     end           always@(posedge clk or negedge rst_n) begin         if(~rst_n)             match = 0;         else             match = state==NINE;     end     endmodule

标签:nstate,FPGA,clk,笔记,信号,rst,input,VL26,match
来源: https://www.cnblogs.com/mahaidong/p/16440686.html