发明名称 |
Constraint validity checking |
摘要 |
A method and apparatus for efficiently determining whether a set of constraints input to a verification tool are mutually contradictory or overconstraining. A set of constraints are mutually contradictory or overconstraining when they define values for system-model variables and/or inputs that are inconsistent with each other at a given state or group of states of a system-model state machine. It has been found that when a set of constraints assign inconsistent values at a given state or group of states of the system-model state space, the verification tool will treat the given state or group of states as a so-called non-returnable state. That is, the verification tool will not recognize any paths from the given state or group of states to a set of reset states. As a result, instead of having to analyze the values defined by every constraint input to the verification tool, it can be determined whether a set of constraints input to the verification tool are mutually contradictory or overconstraining by analyzing only the constraints enabled at the non-returnable states.
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申请公布号 |
US6099575(A) |
申请公布日期 |
2000.08.08 |
申请号 |
US19980102850 |
申请日期 |
1998.06.23 |
申请人 |
LUCENT TECHNOLOGIES INC. |
发明人 |
HARDIN, RONALD H.;KURSHAN, ROBERT PAUL |
分类号 |
G06F17/50;(IPC1-7):G06F17/50;G06F9/45;G06G7/62 |
主分类号 |
G06F17/50 |
代理机构 |
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地址 |
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