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We present a logical formalism for expressing properties of continuous time Markov chains. The semantics for such properties arise as a natural extension of previous work on discrete time Markov chains to continuous time. The major result is that the veriication problem is decidable; this is shown using results in algebraic and transcendental number theory.

We present a logical formalism for expressing properties of continuous-time Markov chains. The semantics for such properties arise as a natural extension of previous work on discrete-time Markov chains to continuous time. The major result is that the verification problem is decidable; this is shown using results in algebraic and transcendental number theory.

In this paper the branching time logic pCTL is deened. pCTL expresses quantitative bounds on the probabilities of correct behavior ; it can be interpreted over discrete Markov processes. A bisim-ulation relation is deened on nite Markov processes, and shown to be sound and complete with respect to pCTL. We extend the universe of models to generalized Markov… (More)

The logic of equality with uninterpreted functions has been proposed for verifying abstract hardware designs. The ability to perform fast satisfiability checking over this logic is imperative for such verification paradigms to be successful. We present symbolic methods for satisfiability checking for this logic. The first procedure is based on restricting… (More)

During the muting of global interconnects, macro blocks form useful routing regions which allow wires to go through but forbid buffers to be inserted. They give restrictions on buffer locations. In this paper, we take these buffer location restrictions into consideration and solve the simultaneous maze routing and bufler insertion problem. Given a block… (More)

— We present new results and numerical studies of very fast schedulers for SMS (Switch-Memory-Switch) routers, which emulate output-queuing by buffering packets in a partitioned shared-memory located between input and output ports. The architecture of Juniper's core routers and Brocade's storage switches is based on SMS. Our numerical results demonstrate… (More)

We address the problem of obtaining good variable orderings for the BDD representation of a system of interacting finite state machines (FSMs). Orderings are derived from the communication structure of the system. Communication complexity arguments are used to prove upper bounds on the size of the BDD for the transition relation of the product machine in… (More)

We propose algorithms which combine simulation with symbolic methods for the veriication of invariants. The motivation is twofold. First, there are designs which are too complex to be formally veriied using symbolic methods; however by the use of symbolic techniques in conjunction with traditional simulation results in better \coverage" relative to the… (More)

We propose an integrated clock tree construction algorithm which performs simultaneous routing, wire sizing and buffer insertion. In existing approaches, wire sizing and clock buffer insertion are typically applied sequentially after a clock tree is generated and routed, i.e., they are done as post-processing steps. None of the known methods can perform… (More)