By Cindy Eisner, Dana Fisman
This e-book describes the valuables Specification Language PSL, lately standardized as IEEE common 1850-2005. PSL used to be built to meet the next standards: effortless to benefit, write, and browse; concise syntax; carefully well-defined formal semantics; expressive energy, allowing the specification for a wide type of genuine international layout homes; identified effective underlying algorithms in simulation, in addition to formal verification. simple positive factors are coated, in addition to complex subject matters comparable to using PSL in multiply-clocked designs. an entire bankruptcy is dedicated to universal blunders, accumulated in the course of the authors' decades of expertise in utilizing and instructing the language.
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Extra resources for A Practical Introduction to PSL (Series on Integrated Circuits and Systems)
They do not start with an assertion of busy, nor do they end with one. 4. 11c) Fig. 11: Repeating a SERE 45 46 Chapter 5. 12a) Fig. 12: Stand-alone [*n] is equivalent to ‘true[*n] the beginning and/or at the end. In other words, it will match any sequence of cycles in which the number of assertions of the Boolean expression being repeated is equal to n (thus the use of the equals sign in [=n]). If you want to disallow the padding at the end, use the goto repetition operator [->n]. The goto repetition operator [->n] is similar to the nonconsecutive repetition operator, except that the sequence of cycles being described ends with an assertion of the Boolean expression being repeated.
10a) 3 Some Philosophy We have seen some basic PSL and gotten a feel for how it is intended to be used. Before we continue, we discuss some of the concepts at the root of PSL. 1 Assertions vs. properties As we have seen, a PSL assertion is made up of the keyword assert plus the PSL property being asserted, followed by a semi-colon. For example, in the assertion assert always (a -> next b);, the property is always (a -> next b). A property holds or does not hold on a given trace. It is agnostic about whether or not holding is a good thing.
Suﬃx implication (|-> and |=>) 39 tion operators (|-> and |=>) can be understood the same way. The diﬀerence between the logical implication operator (->) and the suﬃx implication operators (|-> and |=>) is in the timing relationship between the if- and the then-parts. While the current cycle of the then-part of a logical implication operator (->) is the same as the current cycle of its if-part, the current cycle of the then-part of a suﬃx implication operator (|-> or |=>) is the ﬁrst cycle of the suﬃx of the trace that remains once the if-part has been seen.