1850-2010 IEEE Standard for Property Specification Language - download pdf or read online

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Infinite-length behavior The semantics of PSL allow us to decide whether a PSL property holds on a given behavior. How the outcome of this problem relates to the design depends on the behavior that was analyzed. In dynamic verification, only behaviors that are finite in length are considered. 6 The concept of strength PSL uses the term strong in two different ways: an operator may be strong, and the satisfaction of a property on a path may be strong. While the two are related, the use of the concept of strength in each context is best understood first in isolation.

This applies to expressions appearing directly within a temporal layer property, including those that appear within clock expressions, as well as to any subexpressions of those expressions. The definitions of HDL_EXPR and HDL_CLOCK_EXPR capture this requirement, as shown in Syntax 4-4. 26 Copyright © 2010 IEEE. All rights reserved. Authorized licensed use limited to: University of Allahabad. Downloaded on January 22,2011 at 19:22:22 UTC from IEEE Xplore. Restrictions apply. 4 HDL_VARIABLE_TYPE The formal types of PSL named declarations may be HDL variable types.

With a single argument, stable() returns True if the argument’s value is the same as it was at the previous cycle, with respect to the clock of its context; otherwise, it returns False. If a second argument is specified and has the value c, the Copyright © 2010 IEEE. All rights reserved. 41 Authorized licensed use limited to: University of Allahabad. Downloaded on January 22,2011 at 19:22:22 UTC from IEEE Xplore. Restrictions apply. IEEE Std 1850-2010 IEEE STANDARD FOR built-in function stable() returns True if the first argument’s value is the same as it was at the previous cycle, with respect to clock context c; otherwise, it returns False.

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