Parallel and Distributed VHDL Simulation

This paper presents a methodology for parallel and distributed simulation of VHDL using the PDES (parallel discrete-event simulation) paradigm. To achieve better features and performance, some PDES protocols assume that simultaneous events may be processed in arbitrary order. We describe a solution of how to apply these algorithms to have a correct simulation of the distributed VHDL cycle, including the delta cycle. The solution is based on tiebreaking the simultaneous events using Lamport’s logical clocks to causally order them according to the VHDL simulation cycle, and defining the VHDL virtual time as a pair of simulation physical time and cycle/phase logical time. The paper also shows how to use this method with a PDES protocol that relaxes the simulation of simultaneous events to arbitrary order, allowing the LPs to self-adapt to optimistic or conservative mode, without the lookahead requirement. The lookahead is application-dependent and for some systems may be zero or unkno...

• Type: Conference
• Year: 2000
• Where: DATE
• Authors: Dragos Lungeanu, C.-J. Richard Shi
• Keywords: DATE 2000, Hardware, Simulation, Simultaneous Events, VHDL