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Predefined Attributes
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of a value are equal to the value itself; but for an enumerated type, the position numbers of a value are determined by the declaration of the type Values declared earlier have lower position numbers than values declared later Value blue from the preceding example has a position number of 0, because it is the first value of the type Value cyan has a position number 1, green has 2, and so on From these position numbers, the high and low bounds of the type can be found Signals color5 through color8 are assigned attributes of the type reverse_color This type has a DOWNTO range specification Attributes HIGH and RIGHT do not return the same value because the range is reversed Value red has a higher position number than value green, and therefore a DOWNTO is needed for the range specification
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Value Array Attributes
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There is only one value array attribute: LENGTH Given an array type, this attribute returns the total length of the array range specified This attribute works with array ranges of any scalar type and with multidimensional arrays of scalar-type ranges Following is a simple example:
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PROCESS(a) TYPE bit4 IS ARRAY(0 TO 3) of BIT; TYPE bit_strange IS ARRAY(10 TO 20) OF BIT; VARIABLE len1, len2 : INTEGER; BEGIN len1 := bit4 LENGTH; -- returns 4 len2 := bit_strange LENGTH; -- returns 11 END PROCESS;
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The assignment to len1 assigns the value of the number of elements in array type bit4 The assignment to len2 assigns the value of the number of elements of type bit_strange This attribute also works with enumerated-type ranges, as shown by the following example:
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PACKAGE p_4val IS TYPE t_4val IS ( x , 0 , 1 , z ); TYPE t_4valX1 IS ARRAY(t_4val LOW TO t_4val HIGH) OF t_4val; TYPE t_4valX2 IS ARRAY(t_4val LOW TO t_4val HIGH) OF t_4valX1; TYPE t_4valmd IS ARRAY(t_4val LOW TO t_4val HIGH, t_4val LOW TO t_4val HIGH) OF t_4val;
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CONSTANT andsd : t_4valX2 := (( x , -- xx 0 , -- x0 x , -- x1 (Notice this is an x ), -- xz array of arrays) ( 0 , -- 0x 0 , -- 00 0 , -- 01 0 ), -- 0z ( x , -- 1x 0 , -- 10 1 , -- 11 x ), -- 1z ( x , -- zx 0 , -- z0 x , -- z1 x )); -- zz CONSTANT andmd (( x , - 0 , - x , - x ), -( 0 , - 0 , - 0 , - 0 ), -( x , - 0 , - 1 , - x ), -( x , - 0 , - x , - x )); -END p_4val; : t_4valmd := xx x0 x1 xz (Notice this example 0x is a multidimensional 00 array) 01 0z 1x 10 11 1z zx z0 z1 zz
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The two composite type constants, andsd and andmd, provide a lookup table for an AND function of type t_4val The first constant andsd uses an array of array values, while the second constant andmd uses a multidimensional array to store the values The initialization of both constants is specified by the same syntax If the LENGTH attribute is applied to these types as shown in the following, the results shown in the VHDL comments are obtained:
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PROCESS(a) VARIABLE len1, len2, len3, len4 : INTEGER; BEGIN len1 := t_4valX1 LENGTH; -- returns 4 len2 := t_4valX2 LENGTH; -- returns 4
Predefined Attributes
-- returns 4 -- returns 4
len3 := t_4valmd LENGTH(1); len4 := t_4valmd LENGTH(2); END PROCESS;
Type t_4valX1 is a four-element array of type t_4val The range of the array is specified using the predefined attributes LOW and HIGH of the t_4val type Assigning the length of type t_4valX1 to len1 returns the value 4, the number of elements in array type t_4valX1 The assignment to len2 also returns the value 4, because the range of type t_valX2 is from LOW to HIGH of element type t_4valX1 The assignments to len3 and len4 make use of a multidimensional array type t_4valmd Because a multidimensional array has more than one range, an argument is used to specify a particular range The range defaults to the first range, if none is specified In the type t_4valmd example, the designer can pick the first or second range, because there are only two to choose from To pick a range, the argument passed to the attribute specifies the number of the range starting at 1 An argument value of 1 picks the first range, an argument value of 2 picks the second range, and so on The assignment to len3 in the previous example passed in the value 1 to pick the first range The first range is from t_4val LOW to t_4val HIGH, or four entries The second range is exactly the same as the first; therefore, both assignments return 4 as the length of the array If the argument to LENGTH is not specified, it defaults to 1 This was the case in the first examples of LENGTH, when no argument was specified There was only one range, so the correct range was selected
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