狠狠撸

vhdl sequential statements formal parameters actual parameters unconstrained arrays component instantiation component declaration for...generate component structural description if...generate concurrent statements library entity package architecture basic project design signal attributes user-defined attributes array attributes attributes variable attributes composite data types records arrays lecture file input line file i/o text file output append file write file acii text files file open mode textio binary files read file impure functions overloading operator symbols function overloading function call pure functions functions procedures procedure overloading procedure call subtypes user-defined types data types