next_sreg<=OFF;  next_POWERLED<='0';
     next_PLAYLED<='0'; next_RECORDLED<='0';
    END IF;
    IF ( STOPSWITCH='1' AND POWERSWITCH='1' ) THEN
     next_sreg<=POWERON; next_POWERLED<='1';
     next_PLAYLED<='0'; next_RECORDLED<='0';
    END IF;
   WHEN POWERON =>
    IF ( POWERSWITCH='0' ) THEN
     next_sreg<=OFF;  next_POWERLED<='0';
     next_PLAYLED<='0'; next_RECORDLED<='0';
    ELSIF ( RECORDSWITCH='1' ) THEN
     next_sreg<=RECORDING; next_POWERLED<='1';
     next_PLAYLED<='0';  next_RECORDLED<='1';
    ELSIF ( PLAYSWITCH='1' ) THEN
     next_sreg<=PLAY;     next_POWERLED<='1';
     next_PLAYLED<='1';  next_RECORDLED<='0';
     ELSE
     next_sreg<=POWERON;  next_POWERLED<='1';
     next_PLAYLED<='0';  next_RECORDLED<='0';
    END IF;
   WHEN RECORDING =>
    IF ( POWERSWITCH='1' AND STOPSWITCH='0' ) THEN
     next_sreg<=RECORDING; next_POWERLED<='1';
     next_PLAYLED<='0';  next_RECORDLED<='1';
    END IF;
    IF ( POWERSWITCH='0' ) THEN
     next_sreg<=OFF;   next_POWERLED<='0';
     next_PLAYLED<='0';  next_RECORDLED<='0';
    END IF;
    IF ( STOPSWITCH='1' AND POWERSWITCH='1' ) THEN
     next_sreg<=POWERON;  next_POWERLED<='1';
     next_PLAYLED<='0';  next_RECORDLED<='0';
    END IF;
   WHEN OTHERS =>
  END CASE;
 END PROCESS;
END BEHAVIOR;

整个状态机实现过程比相当简单。快捷。有效。