By Cindy Eisner, Dana Fisman
This booklet describes the valuables Specification Language PSL, lately standardized as IEEE common 1850-2005. PSL was once constructed to satisfy the next standards: effortless to benefit, write, and skim; concise syntax; conscientiously well-defined formal semantics; expressive strength, allowing the specification for a wide classification of genuine international layout houses; identified effective underlying algorithms in simulation, in addition to formal verification. uncomplicated good points are lined, in addition to complex issues reminiscent of using PSL in multiply-clocked designs. a whole bankruptcy is dedicated to universal blunders, amassed in the course of the authors' a long time 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)
In this section, we examine SERE operators that allow you to build more sophisticated SEREs, using variations on the SERE repetition operators [*n], [=n], and [->n]. Consecutive repetition operators provide a shortcut to typing the same sub-SERE a number of times. The [*n] operator is an abbreviation for n repetitions of the SERE it is applied to. 10b. 10b state that after a request (assertion of signal req), we expect to see an acknowledge (assertion of signal ack) followed by three cycles in which signal busy is asserted, followed by an assertion of signal done.
9d) Fig. 9: The before and before operators Starting at cycle 2 and looking forward, we ﬁrst see an assertion of ack (at cycle 3), and only afterwards an assertion of req (at cycle 6). The before operator requires that its ﬁrst operand happen strictly before its second. In order to specify that something must happen before or at the same cycle as something else, use before . 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?
There is no strong version of the operators always and never, for the opposite reason. In the case of always and never, there is no terminating condition to waive. 5 SERE Style Up until now, we have seen PSL properties that are built of Boolean expressions and temporal operators in LTL style. Another way to build properties is to use SEREs – Sequential Extended Regular Expressions. SEREs are similar in spirit to standard regular expressions, like those used for pattern matching in many applications.
A Practical Introduction to PSL (Series on Integrated Circuits and Systems) by Cindy Eisner, Dana Fisman