By Cindy Eisner, Dana Fisman
This booklet describes the valuables Specification Language PSL, lately standardized as IEEE commonplace 1850-2005. PSL used to be built to satisfy the subsequent specifications: effortless to profit, write, and browse; concise syntax; conscientiously well-defined formal semantics; expressive strength, allowing the specification for a wide classification of actual global layout houses; identified effective underlying algorithms in simulation, in addition to formal verification. easy positive factors are coated, in addition to complex issues resembling using PSL in multiply-clocked designs. a whole bankruptcy is dedicated to universal mistakes, collected 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)
For the more complicated assertions of PSL, which ﬁrst of all stand apart from the code (so that the notion of “execution” is foreign 20 Chapter 3. Some Philosophy to them) and which second of all span multiple time steps, the notion of time must be given more consideration. PSL assumes that time is discrete, that is, that time consists of a sequence of evaluation cycles. The meaning of a PSL property is deﬁned relative to such a sequence of cycles. In this book, we will refer to such a sequence of cycles as a trace.
The underscore ( ) is intended to represent the cycle in which we allow an overlap between the left and right sides. 9c. What if the assertion of ack is allowed to come, not together with the next assertion of req, but rather together with the request being acknowledged? 5. eventually! 9(iii)? 9b is not the answer. 9d. 5 eventually! The eventually! operator allows you to specify that something must occur in the future without saying exactly when. 10a states that every request (assertion of req) must be followed at some time with an acknowledge (assertion of ack).
5 Operators without weak or strong versions We have seen weak and strong versions of many operators. The eventually! operator is not a strong version of some other operator. In other words, there is no weak version of eventually!. The reason is that the meaning of other strong operators can be broadly described as requiring that nothing bad must happen up until some terminating condition, and in addition, the terminating condition must eventually occur. The weak versions then waive the requirement that the terminating condition eventually occur, leaving only the requirement that nothing bad must happen.