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后一修订版 		前一修订版
quadraturedecoder_verilog [2020/08/08 17:44]
gongyu 创建 		quadraturedecoder_verilog [2020/08/08 17:46] (当前版本)
gongyu
行 9: 行 9:
 #### 正交解码 #### 正交解码
  
 +<code verilog>
 +module quad(clk, quadA, quadB, count);
 +input clk, quadA, quadB;
 +output [7:0] count;
 +
 +reg quadA_delayed,​ quadB_delayed;​
 +always @(posedge clk) quadA_delayed <= quadA;
 +always @(posedge clk) quadB_delayed <= quadB;
 +
 +wire count_enable = quadA ^ quadA_delayed ^ quadB ^ quadB_delayed;​
 +wire count_direction = quadA ^ quadB_delayed;​
 +
 +reg [7:0] count;
 +always @(posedge clk)
 +begin
 +  if(count_enable)
 +  begin
 +    if(count_direction) count<​=count+1;​ else count<​=count-1;​
 +  end
 +end
 +
 +endmodule
 +</​code>​
 #### 实际的电路 #### 实际的电路
 +<code verilog>
 +module quad(clk, quadA, quadB, count);
 +input clk, quadA, quadB;
 +output [7:0] count;
 +
 +reg [2:0] quadA_delayed,​ quadB_delayed;​
 +always @(posedge clk) quadA_delayed <= {quadA_delayed[1:​0],​ quadA};
 +always @(posedge clk) quadB_delayed <= {quadB_delayed[1:​0],​ quadB};
 +
 +wire count_enable = quadA_delayed[1] ^ quadA_delayed[2] ^ quadB_delayed[1] ^ quadB_delayed[2];​
 +wire count_direction = quadA_delayed[1] ^ quadB_delayed[2];​
 +
 +reg [7:0] count;
 +always @(posedge clk)
 +begin
 +  if(count_enable)
 +  begin
 +    if(count_direction) count<​=count+1;​ else count<​=count-1;​
 +  end
 +end
 +
 +endmodule
 +</​code>​
  
 #### 参考阅读 #### 参考阅读