active low structure black的用法和样例：
- A large low structure often open on all sides.
- The reset inputs are active LOW and prevent triggering while active.
- This active low input is sampled simultaneously with the data during accesses on the memory bus. If asserted, a memory error will be generated.
- The typical motel is a low structure around which is built a parking lot to enable the guest to park their cars as close as possible to their rooms.