diy雕刻機(jī)教程

  //------------------------------------------- Mycpu.v 文件的開始  ------------------------------------------- /****************************************************************************** `timescale 1ns/1ns module CPU(input             clk,                //時鐘            input             reset_n,            //復(fù)位信號            inout      [15:0] rddata,             //讀數(shù)據(jù)            output reg        rd,                 //讀使能            output reg        halt,               //停機(jī)指示            output reg [12:0] addr               //地址            );                      //CPU內(nèi)部用寄存器          reg [1:0]  state;                       //狀態(tài)          reg [12:0] ip;                          //指令指針.           reg [15:0]  opcode;                       //操作碼          reg [15:0] opx1;                       //x1          reg [15:0] opy1;                       //y1          reg [15:0] opx2;                        //x2          reg [15:0] opy2;                        //y2 parameter HLT="HT", G0="G0", G1="G1";          parameter S0=3'b000, S1=3'b001, S2=3'b010;S3=3'b011;S4=3'b100;S5=3'b101;S6=3'b110; //s0指令處理,S1:計(jì)算,s2準(zhǔn)備讀指令S3讀寫數(shù)據(jù)X1,S4讀寫數(shù)據(jù)Y1,S5讀寫數(shù)據(jù)X2,S6讀寫數(shù)據(jù)Y2, always@(posedge clk or negedge reset_n)    if(!reset_n)                                  //如果復(fù)位有效         begin         rd<=1'b1;                                //讀信號無效          halt<=1'b0;                              //清停機(jī)指示         addr<=13'b0;                             //初始指令地址為0         ip<=13'b0;                               //指令指針清0，從0地址執(zhí)行程序         state<=S2;                               //下一狀態(tài)為讀指令周期         end     else             case(state)             S0:                                       begin                        //讀指令處理                        state<=S1;              //設(shè)置下一狀態(tài)                 opy2<=rddata;                                                   case(opcode)      //根據(jù)操作碼不同進(jìn)行處理                                 HLT:             //停機(jī)                                     begin                                     rd<=1'b1;                                       halt<=1'b1;    //置停機(jī)標(biāo)志                                     end                                     G0:             //G0                                      begin                                              rd<=1'b1;                                         ip<=ip+3'd5;   //指令指針加5                                                                             end                                     G1:           //G1                                     begin                                                                           rd<=1'b1;                                                     ip<=ip+12'd5;        //指令指針加5                                           end                                                                                 endcase                          end           S1:                                                  //計(jì)算周期                           begin                 rd<=1'b1;                                    //下一狀態(tài)讀無效                 state<=S2;                                               case(opcode)                         G0:                                 //執(zhí)行G0                         //執(zhí)行G0                         G1:                                //執(zhí)行G1                         //執(zhí)行G1;                        endcase                 end             S2:                                                  //準(zhǔn)備讀指令                begin                      state<=S3;                 rd<=1'b0;                                    //設(shè)置度信號                 addr<=ip;                                    //指令地址                                  end         S3:                                                  //讀寫數(shù)據(jù)周期               begin                      state<=S4;                 opcode<=rddata;                         rd<=1'b0;                                    //設(shè)置度信號                  addr<=addr+3'd1;                                    //x1                                          end         S4:                                                  //讀寫數(shù)據(jù)周期                begin                      state<=S5;                 opx1=rddata;                         rd<=1'b0;                   addr<=addr+3'd1;                                //y1                      end         S5:                                                  //讀寫數(shù)據(jù)周期                begin                      state<=S6;                 opy1=rddata;                                           rd<=1'b0;                   addr<=addr+3'd1;                             //x2                             end         S6:                                                  //讀寫數(shù)據(jù)周期                  begin                      state<=S0;                 opx2=rddata;                           rd<=1'b0;                                    //設(shè)置度信號                 addr<=addr+3'd1;                                 //y2             end                  endcase endmodule 代碼形式為:G1X1Y1X2Y2為連續(xù)從外部RAM讀入5個字,第一個字是操作碼,第二個字是X1,第二個字是Y1,第二個字是X2,第二個字是Y2. //它們之間是不是需要延時?,是不是用阻塞賦值? //這段程序經(jīng)過高手確定沒問題以后,才能繼續(xù)了. //呵呵,需要安裝CPLD模擬環(huán)境了,我還不會,現(xiàn)學(xué).:) //請高手指教，歡迎拍磚

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