A property is called “until property” if it uses one of the below until operators. until s_until until_with s_until_with Until properties are categorized as Overlapped & Non-overlapped and Strong & Weak. So overall four different forms of until properties exist. Weak & Non-Overlapping until property_expr1 until property_expr2 Strong & Non-Overlapping s_until property_expr1 s_until property_expr2 Weak …
The implication construct (|->) allows a us to monitor sequences based on satisfying some criteria, i.e. for a sequence to occur, a preceding sequence must have occurred. The implication consists of left-hand-side called antecedent, an implication operator and right-hand-side called consequence. The implication is a construct located between antecedent and consequence and if there is …
Sequence Properties Properties which contain sequence definitions are called sequence properties.Sequence properties are of three types. weak(sequence_expr) If there is no finite prefix that witnesses inability to match the sequence_expr, weak(sequence_expr) evaluates to true. The following example shows a weak sequential property p1.
weak(b ##1 c);
weak_assert : assert property (@(posedge clk) a |-> p1);
An evaluation attempt of weak_assert assertion returns true in the following …
Property defines set of behaviours of the design. To use those behaviors verification directive must be used. In other words, a property itself does not produce any result. A named property can be declared in module, interface, program, clocking block, package, compilation-unit scope, generate block or checker. In simulation run, property will be either in …