We are implementing this by using state diagram.
Here we have 3 inputs and one output that is an candy.
Depending upon the input the candy is out.
The coins used here are n=5,d=10,q=25
Here we have 3 inputs and one output that is an candy.
Depending upon the input the candy is out.
The coins used here are n=5,d=10,q=25
Code for the Candy Vending Machine:-
`timescale 1ns / 1ps
///////////////////////////////////////////////////////////////////////////
// Company: VHDL Language
// Engineer: Manohar Mohanta
//
// Create Date: 16:50:02 07/06/2017
// Design Name:
// Module Name: vending_machine
// Project Name:
// Target Devices:
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module candy(d,n,q, reset, clk, y);
output reg y;
input d,n,q; //n=5,d=10,q=25;
input clk;
input reset;
reg [2:0] cst, nst;
parameter S0 = 3'b000,
S1 = 3'b001,
S2 = 3'b010,
S3 = 3'b100,
S4 = 3'b101,
S5 = 3'b110,
S6 = 3'b111;
always @(cst or d or n or q)
begin
case (cst)
S0: if (n== 1'b1 && d==1'b0 && q==1'b0)
begin
nst = S1;
y=1'b0;
end
else if(n== 1'b0 && d==1'b1 && q==1'b0)
begin
nst=S2;
y=1'b0;
end
else if(n== 1'b0 && d==1'b0 && q==1'b1)
begin
nst=S5;
y=1'b0;
end
else
begin
nst = cst;
y=1'b0;
end
S1: if (n== 1'b1 && d==1'b0 && q==1'b0)
begin
nst = S2;
y=1'b0;
end
else if(n== 1'b0 && d==1'b1 && q==1'b0)
begin
nst=S3;
y=1'b0;
end
else if(n== 1'b0 && d==1'b0 && q==1'b1)
begin
nst=S6;
y=1'b0;
end
else
begin
nst = cst;
y=1'b0;
end
S2:if (n== 1'b1 && d==1'b0 && q==1'b0)
begin
nst = S3;
y=1'b0;
end
else if(n== 1'b0 && d==1'b1 && q==1'b0)
begin
nst=S4;
y=1'b0;
end
else if(n== 1'b0 && d==1'b0 && q==1'b1)
begin
nst=S0;
y=1'b1;
end
else
begin
nst = cst;
y=1'b0;
end
S3: if (n== 1'b1 && d==1'b0 && q==1'b0)
begin
nst = S4;
y=1'b0;
end
else if(n== 1'b0 && d==1'b1 && q==1'b0)
begin
nst=S5;
y=1'b0;
end
else if(n== 1'b0 && d==1'b0 && q==1'b1)
begin
nst=S0;
y=1'b1;
end
else
begin
nst = cst;
y=1'b0;
end
S4: if (n== 1'b1 && d==1'b0 && q==1'b0)
begin
nst = S5;
y=1'b0;
end
else if(n== 1'b0 && d==1'b1 && q==1'b0)
begin
nst=S6;
y=1'b0;
end
else if(n== 1'b0 && d==1'b0 && q==1'b1)
begin
nst=S0;
y=1'b1;
end
else
begin
nst = cst;
y=1'b0;
end
S5: if (n== 1'b1 && d==1'b0 && q==1'b0)
begin
nst = S6;
y=1'b0;
end
else if(n== 1'b0 && d==1'b1 && q==1'b0)
begin
nst=S0;
y=1'b1;
end
else if(n== 1'b0 && d==1'b0 && q==1'b1)
begin
nst=S0;
y=1'b1;
end
else
begin
nst = cst;
y=1'b0;
end
S6: if (n== 1'b1 && d==1'b0 && q==1'b0)
begin
nst =S0;
y=1'b1;
end
else if(n== 1'b0 && d==1'b1 && q==1'b0)
begin
nst=S0;
y=1'b1;
end
else if(n== 1'b0 && d==1'b0 && q==1'b1)
begin
nst=S0;
y=1'b1;
end
else
begin
nst = cst;
y=1'b0;
end
default: nst = S0;
endcase
end
always@(posedge clk)
begin
if (reset)
cst <= S0;
else
cst <= nst;
end
endmodule
Simulation Result:-
Hello, my name is Manohar Mohanta. I'm a 25 year old self-employed Pirate from India.
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