encode.v.bak

此代码可用modelsim进行仿真

                w_reg<=1'b0;
                r_reg<=1'b0;
                ir_jump<=1'b0;
            end
            12'b1101_????_????://IORLW
            begin
                choice<=5'b01111;
                sel_imm<=1'b0;
                w_ena<=1'b1;
                sel_wd<=1'b0;
                load_pc<=1'b0;
                load_pc_call<=1'b0;
                load_pc_goto<=1'b0;
                load_pc_retlw<=1'b0;
                w_reg<=1'b0;
                r_reg<=1'b0;
                ir_jump<=1'b0;
            end
            12'b1111_????_????://XORLW
            begin
                choice<=5'b10000;
                sel_imm<=1'b0;
                w_ena<=1'b1;
                sel_wd<=1'b0;
                load_pc<=1'b0;
                load_pc_call<=1'b0;
                load_pc_goto<=1'b0;
                load_pc_retlw<=1'b0;
                w_reg<=1'b0;
                r_reg<=1'b0;
                ir_jump<=1'b0;
            end
            12'b0010_01??_????://COMF
            begin
                if(encode[5]==0)
                begin
                    choice<=5'b10001;
                    sel_imm<=1'b1;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
                end
                else if(encode[5]==1)
                begin
                    choice<=5'b10001;
                    sel_imm<=1'b1;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b1;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
                end
            end 
            12'b0100_????_????://BCF
            begin
                choice<=5'b10010;
                sel_imm<=1'b0;
                w_ena<=1'b0;
                sel_wd<=1'b0;
                load_pc<=1'b0;
                load_pc_call<=1'b0;
                load_pc_goto<=1'b0;
                load_pc_retlw<=1'b0;
                w_reg<=1'b1;
                r_reg<=1'b1;
                ir_jump<=1'b0;
            end
            12'b0101_????_????://BSF
            begin
                choice<=5'b10011;
                sel_imm<=1'b0;
                w_ena<=1'b0;
                sel_wd<=1'b0;
                load_pc<=1'b0;
                load_pc_call<=1'b0;
                load_pc_goto<=1'b0;
                load_pc_retlw<=1'b0;
                w_reg<=1'b1;
                r_reg<=1'b1;
                ir_jump<=1'b0;
            end
            12'b0000_11??_????://DECF
            begin
                if(encode[5]==0)
                begin
                    choice<=5'b10100;
                    sel_imm<=1'b0;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
                end
                else if(encode[5]==1)
                begin
                    choice<=5'b10100;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b1;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
                end
            end
            12'b0010_10??_????://INCF
            begin
                if(encode[5]==0)
                begin
                    choice<=5'b10101;
                    sel_imm<=1'b0;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
                end
                else if(encode[5]==1)
                begin
                    choice<=5'b10101;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b1;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
                end
            end
            12'b0010_11??_????://DECFSZ
            begin            
                if(encode[5]==0&&alu_z==0)
                begin
                   choice<=5'b10110;
                    sel_imm<=1'b0;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0; 
                end
                else if(encode[5]==0&&alu_z==1)
                begin
                    choice<=5'b10110;
                    sel_imm<=1'b0;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b1;
                end
                else if(encode[5]==1&&alu_z==0)
                begin
                    choice<=5'b10110;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b1;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
                end
                else if(encode[5]==1&&alu_z==1)
                begin
                    choice<=5'b10110;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b1;
                    r_reg<=1'b0;
                    ir_jump<=1'b1;
                end
            end
            12'b0011_11??_????://INCFSZ
            begin            
                if(encode[5]==0&&alu_z==0)
                begin
                   choice<=5'b10111;
                    sel_imm<=1'b0;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0; 
                end
                else if(encode[5]==0&&alu_z==1)
                begin
                    choice<=5'b10111;
                    sel_imm<=1'b0;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b1;
                end
                else if(encode[5]==1&&alu_z==1)
                begin
                    choice<=5'b10111;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b1;
                    r_reg<=1'b0;
                    ir_jump<=1'b1;
                end
                else if(encode[5]==1&&alu_z==0)
                begin
                    choice<=5'b10111;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b1;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
                end
            end
            12'b0110_????_????://BTFSC
            begin
                if(alu_bitz==0)
                begin
                    choice<=5'b11000;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b1;
                end
                else if(alu_bitz==1)
                begin
                    choice<=5'b11000;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
                end
            end
            12'b0111_????_????://BTFSS
            begin
                if(alu_bitz==0)
                begin
                    choice<=5'b11001;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
                end
                else if(alu_bitz==1)
                begin
                    choice<=5'b11001;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b1;
                end
            end
            12'b1001_????_????://CALL
            begin
                    choice<=5'b11010;
                    sel_imm<=1'b0;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b1;
                    load_pc_call<=1'b1;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
            end
            12'b1000_????_????://RETLW
            begin
                    choice<=5'b11011;
                    sel_imm<=1'b0;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b1;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b1;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
            end
            12'b101?_????_????://GOTO
            begin
                    choice<=5'b11100;
                    sel_imm<=1'b0;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b1;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b1;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
            end
            12'b0000_0000_0???://TRIS
            begin
                    choice<=5'b11101;
                    sel_imm<=1'b0;
                    w_ena<=1'b1;
                    sel_wd<=1'b0;
                    load_pc<=1'b0;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b1;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
            end
            default :
            begin
                    choice<=5'bxxxxx;
                    sel_imm<=1'b0;
                    w_ena<=1'b0;
                    sel_wd<=1'b0;
                    load_pc<=1'b1;
                    load_pc_call<=1'b0;
                    load_pc_goto<=1'b0;
                    load_pc_retlw<=1'b0;
                    w_reg<=1'b0;
                    r_reg<=1'b0;
                    ir_jump<=1'b0;
            end
    endcase
end
endtask
endmodule