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1、自动售咖啡机1.客户需求<1>只售咖啡<2>三元一杯，接收硬币5角和1元<3>不找零钱<4>售货机中杯子永远用不完2.工作流程图3.数据通道4.控制单元5.代码<1>数据通道moduledatapath(equal,ld_sum,sel,clr,clk);//数据通道顶层outputequal;inputld_sum,clr,clk,sel;wire[1:0]M_A;wire[2:0]A_R,R_C;muxm1(M_A,sel,1,2);//低电平选择1addm2(A_R,M_A,R_C);//r代表2位regsm3(R_C,A_
2、R,clk,clr,ld_sum);comparem4(equal,R_C,6);//后面的常量endmodulemodulemux(out,sel,a,b);//数据选择器output[1:0]out;inputsel;input[1:0]a,b;reg[1:0]out;always@(aorborsel)beginif(!sel)out<=a;elseout<=b;endendmodulemoduleadd(out,r,p);//加法器output[2:0]out;input[1:0]r;input[2:0]p;assigno
3、ut=p+{0,r};endmodulemoduleregs(dout,din,clk,clr,ld);//寄存器output[2:0]dout;input[2:0]din;inputclk,clr,ld;reg[2:0]dout;always@(posedgeclk)beginif(clr)dout<=0;elseif(ld)dout<=din;elsedout<=dout;endendmodulemodulecompare(equal,a,b);//比较器outputequal;input[2:0]a,b;assignequa
4、l=(a>=b)?1:0;endmodule<2>控制单元：modulecontrl(p_cup,i_coffe,ld_sum,sel,clr,reset,clk,c1,c2,equal,start,p_ready,i_ready);outputp_cup,i_coffe,ld_sum,sel,clr;inputclk,c1,c2,p_ready,i_ready,reset,start,equal;regp_cup,i_coffe,ld_sum,sel,clr;reg[3:0]present_state,next_state;pa
5、rameterIdle=4'b0000,Wait=4'b0001,Add_a=4'b0010,Add_b=4'b0011,Place_cup=4'b0100,Inject_coffe=4'b0101,Clear_up=4'b0110;always@(posedgeclkornegedgereset)beginif(!reset)present_state<=Idle;elsepresent_state<=next_state;endalways@(present_stateorc1orc2orp_readyori_readyors
6、tart)begincase(present_state)Idle:beginp_cup<=0;i_coffe=0;ld_sum=0;sel=0;clr=1;if(!start)next_state<=Idle;elsenext_state<=Wait;endWait:beginp_cup<=0;i_coffe=0;ld_sum=0;sel=0;clr=0;if(c2)next_state<=Add_a;elseif(c1)next_state<=Add_b;elsenext_state<=Wait;endAdd_a:beginp
7、_cup<=0;i_coffe=0;ld_sum=1;sel=0;clr=0;next_state<=Add_b;endAdd_b:beginp_cup<=0;i_coffe=0;ld_sum=1;sel=0;clr=0;if(!equal)next_state<=Wait;elsenext_state<=Place_cup;endPlace_cup:beginp_cup<=1;i_coffe=0;ld_sum=0;sel=0;clr=0;if(!p_ready)next_state<=Place_cup;elsenext_sta
8、te<=Inject_coffe;endInject_coffe:beginp_cup<=0;i_coffe=1;ld_sum=0;sel=0;clr=0;if(!i_ready)next_state<=Inject_coffe;elsenext_
