BCD码转化余三码.docx

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1、.ModuleBCD_to_Excess_3(data_ou,tdata_in,clk,reset)..outputdata_ou;t ..inputdata_in,clk,rese;t ..parameterS0=3b`000,S1=3b`001,S2=3b`101,S3=3b`111,S4=3b`011,S5=3b`110,S6=3b`010, ..dont_care_case=3b`x,dont_care_out=1b`x; ..reg[2:0]state,next_state; ..regd

2、ata_ou;t ..always@(posedgeclkornegedgereset) ..if(reset==0)state<=s0; ..elsestate<=next_state; ..always@(stateordata_in) ..begin ..data_out=0; ..case(state) ..S0:if(data_in==0) ..beginnext_state=s1;data_out=1;end ..elseif(data_in==1) ..beginnext_state=

3、S2;end ..S1:if(data_in==0) ..beginnext_state=S3;data_out=1;end ..elseif(data_in==1) ..beginnext_state=S4;end ..S2:beginnext_state=S4;data_out=data_in;end ..S3:beginnext_state=S5;data_out=data_in;end ..S4:if(data_in==0) ..beginnext_state=S5;data_out=1;e

4、nd ..elseif(data_in==1) ..beginnext_state=S6;end ..S5:beginnext_state=S0;data_out=data_in;end ..S6:beginnext_state=S0;data_out=data_in;end ..defaul:t ..beginnext_state=dont_care_case; ..data_out=dont_care_ou;tend ..endcase ..end ..endmodule