Resources Contact Us Home
Concurrent simulation of host system at instruction level and input/output system at logic level with two-way communication deadlock resolution

Image Number 2 for United States Patent #5493672.

A method and apparatus is provided for integrating a logic level simulation with an instruction level simulation for more accurate and faster system level simulation for testing. A host system or processors (CPU) is simulated by the instruction level simulator and the simulation of an input/output subsystem is modeled by the logic level simulator. The two simulations work side by side communicating through an interprocess communication (IPC) device and both simulations can perform a read/write access. Hence, a DMA and a slave access can occur at the same time causing a deadlock situation where both simulators are waiting for data and acknowledgment from each other at the same time. An input/output subsystem SBus module resolves this deadlock by deferring the non-DMA transaction. Finally, the synchronization of the two simulations is handled by the invention allowing the two simulators to run as asynchronous peers.

  Recently Added Patents
Method and system for advertisement using internet browser to insert advertisements
System and method for combining different tablets into a pouch
Curable inks comprising surfactant-coated magnetic nanoparticles
High performance strained source-drain structure and method of fabricating the same
Redundant parallel operation of motor vehicle electrical system generators
Method for detecting motion of an electrical device or apparatus
Collaborative system for capture and reuse of software application knowledge and a method of realizing same
  Randomly Featured Patents
Laser or charged-particle-beam fusion reactor with direct electric generation by magnetic flux compression
Method and apparatus for orthogonally overlaying variable chip rate spread spectrum signals
Optical disk recording and/or reproducing apparatus
Conveyor splice box
Method for the preparation of (-)piperazine benzoxazine derivatives
Light-emitting device and display device
Method and apparatus for adaptive control of closed throttle downshifts in an automatic transmission
Method and system for detection of undesirable images
Duplex stainless steel having improved corrosion resistance
Method for determining overall effectiveness of a document