International Business Machines Corporation

Teradyne, Inc.

David J Hoeweler

Joseph H Allen

Gari Singh

Meeta Yadav

John Adam Shriver

Jeffrey M Peters

Heather D Achilles

Michael A Rothman

Content of a publish-subscribe topic tree is provided. This includes receiving a path for a requested topic. The path specifies topics leading from a highest to a lowest level topic in the path. Content in the topic tree is retrieved for matching topics that match the lowest level topic in the path independently of whether the matching topics are on the path in the tree.

Technology for providing content of a publish-subscribe topic tree

A computer implemented method for writing to a software bound ring buffer. A network adapter may determine that data is available to write to the software bound ring buffer. The network adapter determines that a read index is not equal to a write index, responsive to a determination that data is available to write to the software bound ring buffer. The network adapter writes the data to memory referenced by the hardware write index, wherein memory referenced by the write index is offset according to an offset, and the memory contents comprise a data portion and a valid bit. The network adapter writes an epoch value of the write index to the valid bit. The network adapter increments the write index, responsive to writing the data to memory referenced by the write index. Further disclosed is method to access a hardware bound ring buffer.

Control flow in a ring buffer

Ring buffer

A method, computer program product, and system are disclosed for supporting variable data structures and constant data structures in a hardware-based XML PPE. The method may include inserting one or more constant Type-Length-Attributes (TLAs) into an output stream. The constant TLAs are inserted from one or more constant node-sets referenced from a constant table. The method may also include creating one or more variable node-sets. Each variable node-set includes one or more variable TLAs (TLAs saved from a base XML document) and is mapped to a variable table. The method may also include inserting one or more variable TLAs into the output stream inserted from one or more variable node-sets referenced from the variable table.

Supporting variable data structures and constant data structures in a hardware-based extensible markup language (XML) post processing engine (PPE)

An improved system and method for testing high frequency electronic devices. The improvement allows characteristics such as phase noise to be measured while a device under test changes operating frequency (frequency hops) at its normal rate. In accordance with the invention, a dynamic controller programs the frequencies of first and second frequency synthesizers at precisely controlled instants of time. For each of the first and second synthesizers, the dynamic controller includes a frequency memory for storing a sequence of frequency data, a counter for sequencing through the frequency memory, and a timing source for activating the counter. Data stored at each location of the frequency memory represents a frequency to which the respective synthesizer is to be programmed. The output from the first synthesizer is provided to the input of a device under test (DUT), in response to which the DUT generates and output signal. A mixer receives at its inputs the output of the DUT and the output of the second synthesizer. The mixer combines the two inputs to generate a test signal. The test signal can then be digitized, and the resulting digital samples can be evaluated. Under control of the timing source, the dynamic controller steps through different addresses of the frequency memories for the first and second synthesizers. At each memory location, new data are sent to the synthesizers at precisely controlled instants of time. New frequencies are established, and the test signal is again digitized. Characteristics of the DUT can be determined from the digital samples at each frequency that the DUT assumes.

Growing community of inventors

Cambridge, MA, United States of America

David J Hoeweler