基于VHDL的呼吸灯运行卡住

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LIBRARY ieee;USE ieee.std_logic_1164.all;USE ieee.std_logic_unsigned.all;ENtiTY huxideng2 ISPORT(RESET   :IN STD_LOGIC;CLK  :IN STD_LOGIC;led:OUT STD_LOGIC);END huxideng2;ARCHITECTURE PWM OF huxideng2 ISSIGNAL Period_us,Period1uS, Period1mS, Period1S: STD_LOGIC;--the period of the calculatersignal counter:integer range 0 to 300;signal pwm:integer range 0 to 64;BEGIN-- ClockPROCESS( RESET, CLK, Period_us, Period1uS, Period1mS )VARIABLE Count  : STD_LOGIC_VECTOR(5 DOWNTO 0);VARIABLE Count1 : STD_LOGIC_VECTOR(9 DOWNTO 0);VARIABLE Count2 : STD_LOGIC_VECTOR(9 DOWNTO 0);VARIABLE Count3 : STD_LOGIC_VECTOR(2 DOWNTO 0);VARIABLE pwm: STD_LOGIC_VECTOR(7 DOWNTO 0);BEGIN    --Period: 1uS IF( RESET = '1' ) THEN Count := "000000";ELSIF( CLK'EVENT AND CLK='1' ) THENIF( Count>"110000" ) THEN Count := "000000";--  110000:48  50/50M = 1us   count from 0 to 48ELSE                  Count := Count + 1;END IF;Period1uS <= Count(5);END IF;--Period:0.1us        IF(CLK'EVENT AND CLK='1') THEN      IF(Count3>"101") THEN Count3 :="000";      ELSE    Count3 :=Count3+1;      END IF;      Period_us <=Count(2);     END IF;--Period: 1mS IF( Period1uS'EVENT AND Period1uS='1' ) THEN IF( Count1>"1111100110" ) THEN Count1 := "0000000000";  -- 1111100110:998  1000*1us = 1ms   count from 0 to 998ELSE                  Count1 := Count1 + 1;END IF;Period1mS <= Count1(9);END IF;  --Period: 1S IF( Period1mS'EVENT AND Period1mS='1' ) THEN IF( Count2>"1111100110" ) THEN Count2 := "0000000000";   --like aboveELSE                  Count2 := Count2 + 1;END IF;Period1S  <= Count2(9); END IF; END PROCESS;PROCESS(Period_us)       --The Period of the pwmBEGIN  if rising_edge(Period_us) then    if counter=300 then     counter<=0;    pwm<=pwm+1;    if pwm=64 then                  pwm<=0;                end if;    else          counter<=counter+1;    end if;      end if;END PROCESS;    process(Counter,pwm)begin       if counter

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