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IS VARIABLE result : BIT_VECTOR(0 TO (val LENGTH -1)); BEGIN result := val; IF (val LENGTH > 1) THEN FOR i IN 0 TO (val LENGTH -2) LOOP result(i) := result(i 1); END LOOP; result(val LENGTH -1) := 0; ELSE result(0) := 0; END IF; RETURN result; END shift_right; END mypack;
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The package declaration (the first five lines of the model) declares two subtypes: eightbit and fourbit These two subtypes are subtypes of the unconstrained base type BIT_VECTOR These two types constrain the base type to range 0 to 7 for type eightbit and range 0 to 3 for type fourbit In a typical hardware description language without unconstrained types, two different shift-right functions would need to be written to handle the two different-sized subtypes One function would work with type eightbit, and the other would work with type fourbit With unconstrained types in VHDL, a single function can be written that will handle both input types and return the correct type Based on the size of input argument val, the internal variable result is created to be of the same size Variable result is then initialized to the value of input argument val This is necessary because the value of input argument val can only be read in the function; it cannot have a value assigned to it in the function If the size of input argument val is greater than 1, then the shift-right function loops through the length of the subtype value passed into the function Each loop shifts one of the bits of variable result one bit to the right If the size of input argument val is less than 2, we treat this as a special case and return a single bit whose value is 0 RECORD TYPES Record types group objects of many types together as a single object Each element of the record can be accessed by its field name Record elements can include elements of any type, including arrays and records The elements of a record can be of the same type or different types Like arrays, records are used to model abstract data elements Following is an example of a record type declaration:
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TYPE optype IS ( add, sub, mpy, div, jmp );
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TYPE instruction IS RECORD opcode : optype; src : INTEGER; dst : INTEGER; END RECORD;
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The first line declares the enumerated type optype, which is used as one of the record field types The second line starts the declaration of the record The record type declaration begins with the keyword RECORD and ends with the clause END RECORD All of the declarations between these two keywords are field declarations for the record Each field of the record represents a unique storage area that can be read from and assigned data of the appropriate type This example declares three fields: opcode of type optype, and src and dst of type INTEGER Each field can be referenced by using the name of the record, followed by a period and the field name Following is an example of this type of access:
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PROCESS(X) VARIABLE inst : instruction; VARIABLE source, dest : INTEGER; VARIABLE operator : optype; BEGIN source := instsrc; --Ok line 1 dest := instsrc; --Ok line 2 source := instopcode; operator := instopcode; instsrc := dest; instdst := dest; inst := (add, dest, 2); inst := (source); END PROCESS; --error line 3 --Ok line 4 --Ok line 5 --Ok line 6 --Ok line 7 --error line 8
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This example declares variable inst, which is of type instruction Also, variables matching the record field types are declared Lines 1 and 2 show fields of the record being assigned to local process variables The assignments are legal because the types match Notice the period after the name of the record to select the field Line 3 shows an illegal case The type of field opcode does not match the type of variable source The compiler will flag this statement as a type mismatch error Line 4 shows the correct assignment occurring between the field opcode and a variable that matches its type
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