【VHDL ERROR】Actual for formal port a is neither a static name nor a globally static expression

在2002版本的VHDL中，除了类型转换外，不允许在端口映射（port map）时调用函数。

可以将语言版本更新到VHDL 2008，就不再有这个限制。

 

In VHDL up to 2002, it was illegal to have a function call in a port map, other than a type conversion.

In VHDL 2008, this limit no longer applies. So change the language version to VHDL 2008 and there is no error.