International Business Machines Corporation

John Hubert Klaus

Paul E Schardt

Scott Michael Willenborg

Thomas M Armstead

Paul Matthew Krolak

A verification environment enables verification of runtime switch-over&#x2014;i.e., a switch-over without restarting the device under test&#x2014;between multiple I/O protocols that share a same physical interface. The device under test can be a switch unit having multiple logical protocol processing units and a logical protocol multiplexor. The verification environment includes a switch-over detector which monitors the state of the device under test, and a switch-over controller that controls the switch-over sequence by pausing and re-starting traffic on all or specific protocol drivers of the verification environment.

Verifying runtime switch-over between multiple I/O protocols on shared I/O connection

A method and apparatus are provided for implementing multiple configurations of multiple input/output (IO) subsystems in a single simulation model. At least one bus routing switch is included in the single simulation model. Each bus routing switch includes a plurality of ports respectively connected to a plurality of IO busses. Predefined ones of the plurality of IO busses are connected to respective multiple input/output (IO) subsystems in the single simulation model. The bus routing switch is selectively configurable for interconnecting predetermined ones of the plurality of ports. The bus routing switch includes a variable delay latch structure to simulate the effect of long wires. Each bus routing switch includes a plurality of multiplexers. Each of the plurality of multiplexers includes inputs connected to the plurality of ports, an output connected to a respective one of the plurality of ports and has a control input for configuring the bus routing switch.

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Rochester, MN, United States of America

John Hubert Klaus