ModelSim SE User's Manual - Electrical and Computer Engineering

UM-370 14 - PSL Assertions
Understanding assertion names
ModelSim SE User’s Manual
PSL 1.1 provides for named directives via the use of a label. You are not allowed to have
a label that duplicates another symbol in the same scope. In other words, you cannot
explicitly label a PSL directive with a name that already exists (as, say, a signal).
In the absence of a label, ModelSim generates assertion names for reporting information
about the assertions. For example:
property p0 is always a -> b;
assert p0;
The name generated for this assertion statement will be assert__p0. Generically, the syntax
of the generated name is:
assert__.
However, if you write the same assertion in this manner:
assert always a -> b;
there is no property name, so ModelSim will generate a name like assert__0 (i.e., a number
appended to "assert__" ).