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Value Block Attributes
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There are two attributes that form the set of attributes that work with blocks and architectures Attributes STRUCTURE and BEHAVIOR return information about how a block in a design is modeled Attribute BEHAVIOR returns true if the block specified by the block label, or architecture specified by the architecture name, contains no component instantiation statements Attribute STRUCTURE returns true if the block or architecture contains only component instantiation statements and/or passive processes The following two examples illustrate how these attributes work The first example contains only structural VHDL:
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LIBRARY IEEE; USE IEEEstd_logic_1164ALL; ENTITY shifter IS PORT( clk, left : IN std_logic; right : OUT std_logic); END shifter; ARCHITECTURE structural OF shifter IS COMPONENT dff PORT( d, clk : IN std_logic; q : OUT std_logic); END COMPONENT; SIGNAL i1, i2, i3: std_logic; BEGIN
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u1: dff PORT MAP(d => left, clk => clk, q => i1); u2: dff PORT MAP(d => i1, clk => clk, q => i2); u3: dff PORT MAP(d => i2, clk => clk, q => i3); u4: dff PORT MAP(d => i3, clk => clk, q => right); checktime: PROCESS(clk) VARIABLE last_time : time := time left; BEGIN ASSERT (NOW - last_time = 20 ns) REPORT spike on clock SEVERITY WARNING; last_time := now; END PROCESS checktime; END structural;
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The preceding example is a shift register modeled using four dff components connected in series A passive process statement exists in the architecture for entity shifter, used to detect spikes on the clk input The following example shows the results of the attributes for the architecture structural:
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structural BEHAVIOR: returns false structural STRUCTURE: returns true
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The passive process checktime has no effect on the fact that the architecture is structural If the process contained signal assignment statements, then the process would no longer be considered passive, and attribute STRUCTURE would also return false
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Predefined Attributes
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For any block or architecture that does not contain any component instantiation statements, attribute BEHAVIOR is true, and attribute STRUCTURE is false For blocks or architectures that mix structure and behavior, both attributes return false
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Function Kind Attributes
Function attributes return information to the designer about types, arrays, and signals When a function kind attribute is used in an expression, a function call occurs that uses the value of the input argument to return a value The value returned can be a position number of an enumerated value, an indication of whether a signal has changed this delta, or one of the bounds of an array Function attributes can be subdivided into three general classifications: I Function type attributes, which return type values I Function array attributes, which return array bounds I Function signal attributes, which return signal history information
Function Type Attributes
Function type attributes return particular information about a type Given the position number of a value within a type, the value can be returned Also values to the left or right of an input value of a particular type can be returned Function type attributes are one of the following: I POS (value), which returns position number of value passed in I VAL (value), which returns value from position number passed in I SUCC (value), which returns next value in type after input value I PRED (value), which returns previous value in type before input value I LEFTOF (value), which returns value immediately to the left of the input value I RIGHTOF (value), which returns value immediately to the right of the input value
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A typical use of a function type attribute is to convert from an enumerated or physical type to an integer type Following is an example of conversion from a physical type to an integer type:
PACKAGE ohms_law IS TYPE current IS RANGE 0 TO 1000000 UNITS ua; -- micro amps ma = 1000 ua; -- milli amps a = 1000 ma; -- amps END UNITS; TYPE voltage IS RANGE 0 TO 1000000 UNITS uv; -- micro volts mv = 1000 uv; -- milli volts v = 1000 mv; -- volts END UNITS; TYPE resistance IS RANGE 0 TO 100000000 UNITS ohm; -- ohms Kohm = 1000 ohm; -- kilo ohms Mohm = 1000 Kohm;-- mega ohms END UNITS; END ohms_law; use workohms_lawall; ENTITY calc_resistance IS PORT( i : IN current; e : IN voltage; r : OUT resistance); END calc_resistance; ARCHITECTURE behave OF calc_resistance IS BEGIN ohm_proc: PROCESS( i, e ) VARIABLE convi, conve, int_r : integer; BEGIN convi := current POS(i); -- current in ua conve := voltage POS(e); -- voltage in uv -- resistance in ohms int_r := conve / convi; r <= resistance VAL(int_r); ----another way to write this example is shown below r <=resistance VAL(current POS(i) / voltage POS(e));
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