Identifier must be declared with a port mode?

Answer 1

In VHDL, an identifier used to define a port in an entity must be associated with a specific port mode, which indicates how the port will be used. The three primary port modes are in, out, and inout. Specifying a port mode is essential as it defines the direction of data flow: in for input signals, out for output signals, and inout for bidirectional signals. Without declaring a port mode, the VHDL compiler will raise an error, as it cannot determine how to handle the signals connected to that port.