一段关于2FSK解调的代码没看懂
没看懂什么原理，求大神指点！moduleFSK2_JT( clk, rstn, in, out );
inputclk;inputrstn;inputin;outputout;
regout;integeri;integerj;regi_tmp;regcnt;regyt,y0,y1,y2,y3;always@(posedge clk or negedge rstn)begin if(!rstn)cnt<=0;elsebegin if(cnt==4'b1111)cnt<=0; else cnt<=cnt+1'b1; endend
always@(posedgeclk or negedge rstn)begin if(!rstn)i<=0;elsebegin if(in==1)i<=i+1; else if(in==0)begin i<=0;end endend
always@(posedge clk or negedge rstn)begin if(!rstn)begin y3<=0;i_tmp<=0;end else begin if(i==4) i_tmp<=i; else i_tmp<=0; if(i_tmp>=1) begin i_tmp<=i_tmp-1'b1; y3<=1; end else y3<=0; endend
always@(posedge clk or negedge rstn)begin if(!rstn)begin y0<=0;endelsebegin y2<=y3; y1<=y2; y0<=y1; yt<=y0; endendalways@(posedge clk or negedge rstn)begin if(!rstn)begin out<=0;endelsebegin if(y3==1|yt==0) out<=0; if(y3==0|yt==1) out<=0; if(y3==0|yt==0) out<=1; if(y3==1|yt==1) out<=0; endendendmodule
你只看输入 输出就行了 信号是做解调使用的
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