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mealy_onehot_5.v
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mealy_onehot_5.v
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module
fsm
(
input
wire
clk
,
input
wire
reset
,
input
wire
in1
,
input
wire
in2
,
output
reg
out
);
// Define state encoding using parameters
parameter
S0
=
5
'b00000
,
S1
=
5
'b00010
,
S2
=
5
'b00100
,
S3
=
5
'b01000
,
S4
=
5
'b10000
;
reg
[
2
:
0
]
state
,
next_state
;
// Sequential block: state transitions on clock or reset
always
@(
posedge
clk
or
posedge
reset
)
begin
if
(
reset
)
state
<=
S0
;
// Reset to S0
else
state
<=
next_state
;
// Move to next state
end
// Combinational block: next state logic
always
@(
*
)
begin
case
(
state
)
S0:
next_state
=
in1
?
S1
:
S0
;
S1:
next_state
=
in2
?
S2
:
S1
;
S2:
next_state
=
in1
?
S3
:
S2
;
S3:
next_state
=
in2
?
S4
:
S3
;
S4:
next_state
=
S0
;
// Cycle back to S0
default
:
next_state
=
S0
;
// Safe default
endcase
end
// Mealy output logic depends on state and input
always
@(
*
)
begin
out
=
(
state
==
S2
&&
in1
)
||
(
state
==
S4
&&
in2
);
end
endmodule
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