What are the functions of each port mode that can be integrated?

(2) OUT: Output port, the defined channel is the one-way output mode.It is stipulated that data can only flow out from the entity through this port, or the data in the entity can be assigned to this port.That is, from the inside of the port, the port can be assigned, or external data information can be read through the port; and from the outside of the port, the signal can flow out from the port or input signals to the port, such as RAM.Data port, I/O port of MCU, etc.Compared with the INOUT mode, the BUFFER readback signal is not input from the outside, but is internally generated and outputted.