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A delayed version of the clk input is used to trigger the hold-check The clk input is delayed by the amount of the hold-check If the data input changes within the hold time, d LAST_EVENT returns a value that is less than the hold time When d changes exactly at the same time as the delayed clk input, d LAST_EVENT returns 0 ns This is a special case and is legal so it must be handled specially An alternative method for checking the hold time of a device is to trigger the hold-check process when the d input changes and then look back at the last change on the clk input However, this is more complicated and requires the designer to manually keep track of the last reference edge on the clk input Another interesting feature of attributes that this model pointed out is the cascading of attributes In the preceding example, the delayed version of the clk signal was checked for an event This necessitated the use of clk DELAYED (hold_time) EVENT The return value from this attribute is true whenever the signal created by the DELAYED attribute has an event during the current delta time point In general, attributes can be cascaded any level if the values returned from the previous attribute are appropriate for the next attribute
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Attribute STABLE
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Attribute STABLE is used to determine the relative activity level of a signal It can be used to determine if the signal just changed or has not changed in a specified period of time The resulting value output is itself a signal that can be used to trigger other processes Following is an example of how attribute STABLE works:
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LIBRARY IEEE; USE IEEEstd_logic_1164ALL; ENTITY pulse_gen IS PORT( a : IN std_logic; PORT( b : OUT BOOLEAN); END pulse_gen; ARCHITECTURE pulse_gen OF pulse_gen IS BEGIN b <= a STABLE( 10 ns ); END pulse_gen;
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Figure 6-3 shows the resulting waveform b when waveform a is presented to the model
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Figure 6-3 Example Showing DELAYED (10ns)
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At the first two changes in signal a (10 ns and 30 ns), signal b immediately changes to false (actually at the next delta) Then when signal a has been stable for 10 ns, signal b changes to true At time 55 ns, signal a changes value again, so signal b changes to false Because signal a changes 5 ns later (60 ns), signal a has not been stable long enough to allow output b to go to a true value Only at 10 ns after the last change on signal a (60 ns) is the input signal a stable long enough to allow signal b to change to true If the time value specified for the STABLE attribute is 0 ns, or not specified, then the STABLE attribute is false for 1 delta whenever the signal that the attribute is attached to changes An example of this scenario is shown in Figure 6-4 When used in this method, the resulting signal value has the same timing but opposite value as function attribute EVENT A statement to detect the rising edge of a clock could be written in two ways, as shown here:
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IF (( clk EVENT ) AND ( clk = 1 ) AND ( clk LAST_VALUE = 0 )) THEN -- DO PROCESSING END IF;
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IF (( NOT( clk STABLE) ) AND ( clk = 1 ) AND ( clk LAST_VALUE = 0 )) THEN --- DO PROCESSING END IF;
Figure 6-4 Example Showing DELAYED (0 ns)
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One Delta wide
In both cases, the IF statement detects the rising edge; but the IF statement using EVENT is more efficient in memory space and speed The reason for this is that attribute STABLE creates an extra signal in the design that uses more memory to store, and whenever the value for the new signal needs to be updated, it must be scheduled Keeping track of signal events costs memory and time
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