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Line 2 of the example declares a file type rom_data_file_t that is used to declare a file object In line 3, a rom_data_file object is declared In this example, the physical disk path name was hard-coded into the model, but a generic could have been used to pass a different path name for each instance of the rom Line 6 of the example tests variable rom_init for true or false If false, the initialization loop is executed Line 7 is the start of the initialization loop The loop test makes use of the predefined function ENDFILE The loop executes until there is no more data in the file or when the rom storage area has been filled Each pass through the loop calls the predefined procedure READ This procedure reads one integer at a time and places it in the element of rom_data that is currently being accessed Each time through the loop, the index i is incremented to the next element position Finally, when the loop finishes, the variable rom_init is set to true The next time the process is invoked, variable rom_init will be true, so the initialization loop will not be invoked again Writing a file is analogous to reading, except that the loop does not test every time through for an end-of-file condition Each time a loop writing data is executed, the new object is appended to the end of the file When the model is writing to a file, the file must have been declared with mode OUT
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In general, the file operations allowed are limited Files cannot be opened, closed, or accessed in a random sequence All that VHDL provides is a simple sequential capability See Appendix D for a description of VHDHL93 file access For textual input and output, there is another facility that VHDL provides called TextIO This facility provides for formatted textual input and output and is discussed in 8, Advanced Topics
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Subtype declarations are used to define subsets of a type The subset can contain the entire range of the base type but does not necessarily need to A typical subtype adds a constraint or constraints to an existing type
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The type integer encompasses the minimum range -2,147,483,647 to 2,147,483,647 In the Standard package (a designer should never redefine any of the types used in the Standard package; this can result in incompatible VHDL, because of type mismatches), there is a subtype called NATURAL whose range is from 0 to 2,147,483,647 This subtype is defined as shown here:
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TYPE INTEGER IS -2,147,483,647 TO 2,147,483,647; SUBTYPE NATURAL IS INTEGER RANGE 0 TO 2,147,483,647;
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After the keyword SUBTYPE is the name of the new subtype being created The keyword IS is followed by the base type of the subtype In this example, the base type is INTEGER An optional constraint on the base type is also specified So why would a designer want to create a subtype There are two main reasons for doing so: I To add constraints for selected signal assignment statements or case statements I To create a resolved subtype (Resolved types are discussed along with resolution functions in 5) When a subtype of the base type is used, the range of the base type can be constrained to be what is needed for a particular operation Any functions that work with the base type also work with the subtype Subtypes and base types also allow assignment between the two types A subtype can always be assigned to the base type because the range of the subtype is always less than or equal to the range of the base type The base type may or may not be able to be assigned to the subtype, depending on the value of the object of the base type If the value is within the value of the subtype, then the assignment succeeds; otherwise, a range constraint error results A typical example where a subtype is useful is adding a constraint to a numeric base type In the previous example, the NATURAL subtype constrained the integer base type to the positive values and zero But what if this range is still too large The constraint specified can be a userdefined expression that matches the type of the base type In the following example, an 8-bit multiplexer is modeled with a much smaller constraint on the integer type:
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PACKAGE mux_types IS SUBTYPE eightval IS INTEGER RANGE 0 TO 7; --line 1 END mux_types;
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