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I have code and test bench however it is not working
porperly. Need help to get it working.
module fsm(clock,reset,coin,vend,state,change);
\\these are the inputs and the outputs.
input clock;
input reset;
input [2:0]coin;
output vend;
output [2:0]state;
output [2:0]change;
\\i need to define the registers as change,coin and vend
reg vend;
reg [2:0]change;
wire [2:0]coin;
\\my coins are declared as parameters to make reading
better.
parameter [2:0]NICKEL=3’b001;
parameter [2:0]DIME=3’b010;
parameter [2:0]NICKEL_DIME=3’b011;
parameter [2:0]DIME_DIME=3’b100;
parameter [2:0]QUARTER=3’b101;
\\MY STATES ARE ALSO PARAMETERS . I DONT WANT TO MAKE YOU
READ
\\IN MACHINE LANGUAGE
parameter [2:0]IDLE=3’b000;
parameter [2:0]FIVE=3’b001;
parameter [2:0]TEN=3’b010;
parameter [2:0]FIFTEEN=3’b011;
parameter [2:0]TWENTY=3’b100;
parameter [2:0]TWENTYFIVE=3’b101;
\\AS ALWAYS THE STATES ARE DEFINED AS REG
reg [2:0]state,next_state;
\\MY MACHINE WORKS ON STATE AND COIN
always @(state or coin)
begin
next_state=0; \\VERYFIRST NEXT STATE IS GIVEN ZERO
case(state)
IDLE: case(coin) \\THIS IS THE IDLE STATE
NICKEL: next_state=FIVE;
DIME: next_state=TEN;
QUARTER: next_state=TWENTYFIVE;
default: next_state=IDLE;
endcase
FIVE: case(coin) \\THIS IS THE SECOND STATE
NICKEL: next_state=TEN;
DIME: next_state=FIFTEEN;
QUARTER: next_state=TWENTYFIVE; //change=NICKEL
default: next_state=FIVE;
endcase
TEN: case(coin) \\THIS IS THE THIRD STATE
NICKEL: next_state=FIFTEEN;
DIME: next_state=TWENTY;
QUARTER: next_state=TWENTYFIVE; //change=DIME
default: next_state=TEN;
endcase
FIFTEEN: case(coin) \\THIS IS THE FOURTH STATE
NICKEL: next_state=TWENTY;
DIME: next_state=TWENTYFIVE;
QUARTER: next_state=TWENTYFIVE; //change==NICKEL_DIME
default: next_state=FIFTEEN;
endcase
TWENTY: case(coin) \\THIS IS THE FIFTH STATE
NICKEL: next_state=TWENTYFIVE;
DIME: next_state=TWENTYFIVE; //change=NICKEL
QUARTER: next_state=TWENTYFIVE; //change==DIME_DIME
default: next_state=TWENTY;
endcase
TWENTYFIVE: next_state=IDLE; \\THE NEXT STATE HERE IS THE
RESET
default : next_state=IDLE;
endcase
end
always @(clock)
begin \\WHENEVER I GIVE A RESET I HAVE TO MAKE THE STATE TO
IDLE AND VEND TO 1
if(reset) begin
state <= IDLE;
vend <= 1’b0;
// change <= 3’b000;
end \\THE CHANGE ALSO HAS TO BECOME NONE
else state <= next_state;
case (state) \\HERE WE DECIDE THE NEXT STATE
\\ALL THE STATES ARE DEFINED HERE AND THE OUTPUT IS ALSO
GIVEN
IDLE: begin vend <= 1’b0; change <=3’d0; end
FIVE: begin vend <= 1’b0; if (coin==QUARTER) change
<=NICKEL; else change <=3’d0; TEN: begin vend <= 1’b0; if
(coin==QUARTER) change <=DIME; else change <= 3’d0;
FIFTEEN : begin vend <= 1’b0; if (coin==QUARTER) change
<=NICKEL_DIME; else change TWENTY : begin vend <= 1’b0; if
(coin==DIME) change <=NICKEL; else if (coin==QUARTER)
TWENTYFIVE : begin vend <= 1’b1; change <=3’d0; end
default: state <= IDLE;
endcase
end
endmodule
module test;
\\THE INPUT IN THE FSM MODULE ARE REG HERE
reg clock,reset;
reg [2:0]coin;
\\THE OUTPUT IN THE FSM MODULE ARE WIRES HERE
wire vend;
wire [2:0]state;
wire [2:0]change;
\\THE PARAMETERS AGAIN FOR THE COIN AND STATE
parameter [2:0]IDLE=3’b000;
parameter [2:0]FIVE=3’b001;
parameter [2:0]TEN=3’b010;
parameter [2:0]FIFTEEN=3’b011;
parameter [2:0]TWENTY=3’b100;
parameter [2:0]TWENTYFIVE=3’b101;
parameter [2:0]NICKEL=3’b001;
parameter [2:0]DIME=3’b010;
parameter [2:0]NICKEL_DIME=3’b011;
parameter [2:0]DIME_DIME=3’b100;
parameter [2:0]QUARTER=3’b101;
\\I MONITOR THE TIME,DRINK,RESET,CLOCK,STATE AND CHANGE FOR
CHANGES.
initial begin
$display("Time\tcoin\tdrink\treset\tclock\tstate\tchange");
$monitor("%g\t%b\t%b\t%b\t%b\t%d\t%
d",$time,coin,vend,reset,clock,state,change);
\\NEW FEATURE: MY MACHINE HAS THE FACILITY TO DUMP
VARIABLES SO THAT
\\ I CAN VIEW THEM USING A VCD VIEWER.
$dumpvars;
$dumpfile("file.vcd"); // Dump output file.
\\THIS IS WHERE THE COINS ARE ADDED.
clock=0;
reset=1; \\FIRST LETS RESET THE MACHINE
#2 reset=0;
coin=NICKEL; \\CHECK FOR STATE 1
#2 reset=1; coin=2’b00;
#2 reset=0;
coin=DIME;
\\RESET AGAIN AND CHECK FOR STATE 2
#2 reset=1; coin=2’b00;
#2 reset=0;
\\RESET AGAIN AND CHECK FOR STATE 5
coin=QUARTER;
#2 reset=1; coin=2’b00;
#2 reset=0;
\\RESET AGAIN AND CHECK FOR STATE 5
coin=NICKEL;
#2 coin=NICKEL;
#2 coin=NICKEL;
#2 coin=NICKEL;
#2 coin=NICKEL;
#2 reset=1; coin=2’b00;
#2 reset=0;
\\RESET AGAIN AND CHECK FOR STATE 5 AND SO ON
coin=NICKEL;
#2 coin=DIME;
#2 coin=DIME;
#2 reset=1; coin=2’b00;
#2 reset=0;
coin=NICKEL;
#2 coin=DIME;
#2 coin=QUARTER;
#2 reset=1; coin=2’b00;
#2 reset=0;
coin=NICKEL;
#2 coin=NICKEL;
#2 coin=NICKEL;
#2 coin=DIME;
#2 reset=1; coin=2’b00;
#2 reset=0;
coin=NICKEL;
#2 coin=NICKEL;
#2 coin=NICKEL;
#2 coin=NICKEL;
#2 coin=DIME;
#2 reset=1; coin=2’b00;
#2 reset=0;
coin=NICKEL;
#2 coin=NICKEL;
#2 coin=QUARTER;
#2 reset=1; coin=2’b00;
#2 reset=0;
coin=NICKEL;
#2 coin=QUARTER;
#2 reset=1; coin=2’b00;
#2 $finish;
end
\\THE CLOCK NEEDS TO TICK EVERY 2 TIME UNIT
always
#1 clock=~clock;
//always @(state)
// coin=!coin;
initial begin
if (reset)
coin=2’b00;
end
\\THIS IS WHERE I INSTANTIATE THE MACHINE
fsm inst1(clock,reset,coin,vend,state,change);
endmodule
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I have code and test bench however it is not working porperly. Need help to get it working. module fsm(clock,reset,coin,vend,state,change); \\these are the inputs and the outputs. input clock; input reset; input [2:0]coin; output vend; output [2:0]state; output [2:0]change; \\i need to define the registers as change,coin and vend reg vend; reg [2:0]change; wire [2:0]coin; \\my coins are declared as parameters to make reading better. parameter [2:0]NICKEL=3’b001; parameter [2:0]DIME=3’b010; parameter [2:0]NICKEL_DIME=3’b011; parameter [2:0]DIME_DIME=3’b100; parameter [2:0]QUARTER=3’b101; \\MY STATES ARE ALSO PARAMETERS . I DONT WANT TO MAKE YOU READ \\IN MACHINE LANGUAGE parameter [2:0]IDLE=3’b000; parameter [2:0]FIVE=3’b001; parameter [2:0]TEN=3’b010; parameter [2:0]FIFTEEN=3’b011; parameter [2:0]TWENTY=3’b100; parameter [2:0]TWENTYFIVE=3’b101; \\AS ALWAYS THE STATES ARE DEFINED AS REG reg [2:0]state,next_state; \\MY MACHINE WORKS ON STATE AND COIN always @(state or coin) begin next_state=0; \\VERYFIRST NEXT STATE IS GIVEN ZERO case(state) IDLE: case(coin) \\THIS IS THE IDLE STATE NICKEL: next_state=FIVE; DIME: next_state=TEN; QUARTER: next_state=TWENTYFIVE; default: next_state=IDLE; endcase FIVE: case(coin) \\THIS IS THE SECOND STATE NICKEL: next_state=TEN; DIME: next_state=FIFTEEN; QUARTER: next_state=TWENTYFIVE; //change=NICKEL default: next_state=FIVE; endcase TEN: case(coin) \\THIS IS THE THIRD STATE NICKEL: next_state=FIFTEEN; DIME: next_state=TWENTY; QUARTER: next_state=TWENTYFIVE; //change=DIME default: next_state=TEN; endcase FIFTEEN: case(coin) \\THIS IS THE FOURTH STATE NICKEL: next_state=TWENTY; DIME: next_state=TWENTYFIVE; QUARTER: next_state=TWENTYFIVE; //change==NICKEL_DIME default: next_state=FIFTEEN; endcase TWENTY: case(coin) \\THIS IS THE FIFTH STATE NICKEL: next_state=TWENTYFIVE; DIME: next_state=TWENTYFIVE; //change=NICKEL QUARTER: next_state=TWENTYFIVE; //change==DIME_DIME default: next_state=TWENTY; endcase TWENTYFIVE: next_state=IDLE; \\THE NEXT STATE HERE IS THE RESET default : next_state=IDLE; endcase end always @(clock) begin \\WHENEVER I GIVE A RESET I HAVE TO MAKE THE STATE TO IDLE AND VEND TO 1 if(reset) begin state <= IDLE; vend <= 1’b0; // change <= 3’b000; end \\THE CHANGE ALSO HAS TO BECOME NONE else state <= next_state; case (state) \\HERE WE DECIDE THE NEXT STATE \\ALL THE STATES ARE DEFINED HERE AND THE OUTPUT IS ALSO GIVEN IDLE: begin vend <= 1’b0; change <=3’d0; end FIVE: begin vend <= 1’b0; if (coin==QUARTER) change <=NICKEL; else change <=3’d0; TEN: begin vend <= 1’b0; if (coin==QUARTER) change <=DIME; else change <= 3’d0; FIFTEEN : begin vend <= 1’b0; if (coin==QUARTER) change <=NICKEL_DIME; else change TWENTY : begin vend <= 1’b0; if (coin==DIME) change <=NICKEL; else if (coin==QUARTER) TWENTYFIVE : begin vend <= 1’b1; change <=3’d0; end default: state <= IDLE; endcase end endmodule module test; \\THE INPUT IN THE FSM MODULE ARE REG HERE reg clock,reset; reg [2:0]coin; \\THE OUTPUT IN THE FSM MODULE ARE WIRES HERE wire vend; wire [2:0]state; wire [2:0]change; \\THE PARAMETERS AGAIN FOR THE COIN AND STATE parameter [2:0]IDLE=3’b000; parameter [2:0]FIVE=3’b001; parameter [2:0]TEN=3’b010; parameter [2:0]FIFTEEN=3’b011; parameter [2:0]TWENTY=3’b100; parameter [2:0]TWENTYFIVE=3’b101; parameter [2:0]NICKEL=3’b001; parameter [2:0]DIME=3’b010; parameter [2:0]NICKEL_DIME=3’b011; parameter [2:0]DIME_DIME=3’b100; parameter [2:0]QUARTER=3’b101; \\I MONITOR THE TIME,DRINK,RESET,CLOCK,STATE AND CHANGE FOR CHANGES. initial begin $display("Time\tcoin\tdrink\treset\tclock\tstate\tchange"); $monitor("%g\t%b\t%b\t%b\t%b\t%d\t% d",$time,coin,vend,reset,clock,state,change); \\NEW FEATURE: MY MACHINE HAS THE FACILITY TO DUMP VARIABLES SO THAT \\ I CAN VIEW THEM USING A VCD VIEWER. $dumpvars; $dumpfile("file.vcd"); // Dump output file. \\THIS IS WHERE THE COINS ARE ADDED. clock=0; reset=1; \\FIRST LETS RESET THE MACHINE #2 reset=0; coin=NICKEL; \\CHECK FOR STATE 1 #2 reset=1; coin=2’b00; #2 reset=0; coin=DIME; \\RESET AGAIN AND CHECK FOR STATE 2 #2 reset=1; coin=2’b00; #2 reset=0; \\RESET AGAIN AND CHECK FOR STATE 5 coin=QUARTER; #2 reset=1; coin=2’b00; #2 reset=0; \\RESET AGAIN AND CHECK FOR STATE 5 coin=NICKEL; #2 coin=NICKEL; #2 coin=NICKEL; #2 coin=NICKEL; #2 coin=NICKEL; #2 reset=1; coin=2’b00; #2 reset=0; \\RESET AGAIN AND CHECK FOR STATE 5 AND SO ON coin=NICKEL; #2 coin=DIME; #2 coin=DIME; #2 reset=1; coin=2’b00; #2 reset=0; coin=NICKEL; #2 coin=DIME; #2 coin=QUARTER; #2 reset=1; coin=2’b00; #2 reset=0; coin=NICKEL; #2 coin=NICKEL; #2 coin=NICKEL; #2 coin=DIME; #2 reset=1; coin=2’b00; #2 reset=0; coin=NICKEL; #2 coin=NICKEL; #2 coin=NICKEL; #2 coin=NICKEL; #2 coin=DIME; #2 reset=1; coin=2’b00; #2 reset=0; coin=NICKEL; #2 coin=NICKEL; #2 coin=QUARTER; #2 reset=1; coin=2’b00; #2 reset=0; coin=NICKEL; #2 coin=QUARTER; #2 reset=1; coin=2’b00; #2 $finish; end \\THE CLOCK NEEDS TO TICK EVERY 2 TIME UNIT always #1 clock=~clock; //always @(state) // coin=!coin; initial begin if (reset) coin=2’b00; end \\THIS IS WHERE I INSTANTIATE THE MACHINE fsm inst1(clock,reset,coin,vend,state,change); endmodule
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