signal_gene.v

来自「yong VerilogHDL yu yan bianxie de pinlv 」· Verilog 代码 · 共 99 行

module signal_gene(clkin,rst,control,i,q_out);
    input clkin,rst;
    input[1:0] control;                             
    input[5:0] i;                                   
    output[7:0] q_out;
    reg[7:0] q_out;
    reg[8:0] address;
    reg[7:0] m,k;
    datarom datarom_component(.address(address),.clock(clkin),.q(q_out));
    
    always @(posedge clkin or negedge rst)
        begin
          if(!rst) 
            begin
              address<=0;
            end
          else 
            begin
              case(control)
            2'b00: begin                              
                     if(control==1) address<=128;
                     if(control==2) address<=256;
                     if(control==3) address<=384;
                     if(i==0||i==1)
                       begin
                         address<=address+1;
                         if(address==127) address<=0;
                       end
                     else
                       begin
                         k<=127/i;m<=i*k;
                         address<=address+i;
                         if(address>=m) address<=0;
                       end
                   end 
            2'b01: begin                              
                     if(control==0) address<=0;
                     if(control==2) address<=256;
                     if(control==3) address<=384;
                     if(address<128) address<=128;
                     else 
                       begin
                         if(i==0||i==1)
                           begin
                             address<=address+1;
                             if(address==255) address<=128;
                           end
                         else
                           begin
                             k<=127/i;m<=i*k;
                             address<=address+i;
                             if(address>=(m+128)) address<=128;
                           end
                       end
                   end        
            2'b10: begin                              
                     if(control==0) address<=0;
                     if(control==1) address<=128;
                     if(control==3) address<=384;
                     if(address<256) address<=256;
                     else 
                       begin
                         if(i==0||i==1)
                           begin
                             address<=address+1;
                             if(address==383) address<=256;
                           end
                         else
                           begin
                             k<=127/i;m<=i*k;
                             address<=address+i;
                             if(address>=(m+256)) address<=256;
                           end
                       end
                   end        
            2'b11: begin                              
                     if(control==1) address<=128;
                     if(control==2) address<=256;
                     if(control==3) address<=384;
                     if(address<384) address<=384;
                     else 
                       begin
                         if(i==0||i==1)
                           begin
                             address<=address+1;
                             if(address==511) address<=384;
                           end
                         else
                           begin
                             k<=127/i;m<=i*k;
                             address<=address+i;
                             if(address>=(m+384)) address<=384;
                           end
                         end
                    end
               endcase          
        end
    end
endmodule