image.png
module top_module(
input clk,
input areset, // Asynchronous reset to OFF
input j,
input k,
output out); //
parameter OFF=0, ON=1;
reg state, next_state;
always @(*) begin
case(state)
ON:
if(k) next_state = OFF;
else if(~k) next_state = ON;
else next_state = ON;
OFF:
if(j) next_state = ON;
else if(~j) next_state = OFF;
else next_state = OFF;
// State transition logic
endcase
end
always @(posedge clk, posedge areset) begin
if(areset)
state <= OFF;
else
state <= next_state;// State flip-flops with asynchronous reset
end
// Output logic
assign out = (state == OFF)? 0 : 1;
// assign out = (state == ...);
endmodule
-----------------------------官网参考答案--------------------------------
module top_module (
input clk,
input j,
input k,
input areset,
output out
);
parameter A=0, B=1;
reg state;
reg next;
always_comb begin
case (state)
A: next = j ? B : A; //这里采用三目运算符简化 了代码量
B: next = k ? A : B;
endcase
end
always @(posedge clk, posedge areset) begin
if (areset) state <= A;
else state <= next;
end
assign out = (state==B);
endmodule
image.png
module top_module(
input clk,
input reset, // Synchronous reset to OFF
input j,
input k,
output out); //
parameter OFF=0, ON=1;
reg state, next_state;
always @(*) begin
case(state)
ON: next_state = (k==0)? ON:OFF;
OFF: next_state = (j==0)? OFF:ON;
endcase
// State transition logic
end
always @(posedge clk) begin
if(reset)
state <= OFF;
else
state <= next_state;// State flip-flops with synchronous reset
end
// Output logic
assign out = (state== OFF) ? 0:1;
// assign out = (state == ...);
endmodule
-
The following is the state transition table for a Moore state machine with one input, one output, and four states. Use the following state encoding: A=2'b00, B=2'b01, C=2'b10, D=2'b11.
**Implement only the state transition logic and output logic **(the combinational logic portion) for this state machine. Given the current state (state), compute the next_state and output (out) based on the state transition table.
image.png
module top_module(
input in,
input [1:0] state,
output [1:0] next_state,
output out); //
parameter A=0, B=1, C=2, D=3;
always@(*)
case(state)
A: next_state = (in)?B:A;
B: next_state = (in)?B:C;
C: next_state = (in)?D:A;
D: next_state = (in)?B:C;
endcase
// State transition logic: next_state = f(state, in)
assign out = (state==D)?1:0;
// Output logic: out = f(state) for a Moore state machine
endmodule
