显示页面讨论修订记录反向链接回到顶部 本页面只读。您可以查看源文件，但不能更改它。如果您觉得这是系统错误，请联系管理员。 ### 正交解码及在旋转编码器中的应用 关于旋转编码器的使用，请参见[[旋转编码器模块]] #### 什么是正交信号？ #### 正交信号用在哪里？ #### 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 <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