三段式状态机问题
本帖最后由 fpgaw 于 2010-11-19 06:38 编辑sync_proc
ROCESS(RST,CLK)BEGIN
IF RST = '0' THEN
current_state<=idle_state;
ELSIF CLK'EVENT and CLK='1' THEN
current_state<=next_state;
END IF;
END PROCESS sync_proc;
comb_proc
ROCESS(current_state,counter0)
BEGIN
next_state<=current_state;
CASE current_state IS
WHEN idle_state => --idle stage
next_state <= start_state;
WHEN start_state => --start stage
IF counter0 = 2400 THEN --M2 run after M1 forwarding 2400 steps
next_state <= work_state;
ELSE
next_state <= start_state;
END IF;
WHEN work_state => --work stage
next_state <= work_state;
WHEN others =>
next_state <= idle_state;
END CASE;
END PROCESS comb_proc;
COUNTER:process(CLK1,next_state)begin
if(CLK1'event and CLK1='1') then
if next_state = start_state then
if counter0 < 2400 then
counter0 <= counter0+1;
else
counter0 <= 2400;
end if;
end if;
end if;
end process COUNTER;
SPEED_CTRL:process(CLK,next_state)
begin
if CLK'event and CLK='1' then
case next_state is
when idle_state =>
...
when start_state =>
...
when others =>
...
end case;
end if;
end process SPEED_CTRL;
三段式状态机，在start_state延时2400个脉冲进入work_state，但是在第三段的输出信号时，在work_state中无输出信号，是因为状态机不能进入work_state的原因吗？我这样用counter0控制状态机进行状态转移可行吗？请高手指教，非常感谢 rst信号查查看 BEGIN<br>
next_state<=current_state;这句去掉看看 三段式状态机，在start_state延时2400个脉冲进入work_state，但是在第三段的输出信号时，在work_state中无输出信号，是因为状态机不能进入work_state的原因吗？我这样用counter0控制状态机进行状态转移可行吗？请高手指教，非常感谢
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