Brian K Langendorf is a notable inventor based in Worcester, MA (US), recognized for his contributions to computer systems technology. He holds a total of five patents, showcasing his expertise in developing innovative solutions for multiprocessor computer systems.

Latest Patents

One of his latest patents is titled "System bus for multiprocessor computer system." This invention comprises a system bus apparatus and method for a multi-arm, multiprocessor computer system that includes a main memory and localized buffer cache memories at each processor. Each block of data in a cache includes tag bits that identify the condition of the data block in relation to the corresponding data in main memory and other caches. The system bus (SYSBUS) consists of three subparts: a MESSAGE/DATA bus, a REQUEST/GRANT bus, and a BCU bus. The MESSAGE/DATA bus is connected to every device on the system and is utilized for transferring messages, data, and addresses. The REQUEST/GRANT bus connects every device on an arm of the system to that arm's bus control unit (BCU). The BCU bus links the various BCUs. Both the MESSAGE/DATA bus and the BCU bus include ACK/NACK/HIT bits, which are used to inform the message-issuing device if the devices received the message and the condition of the data in relation to other caches and main memory. This protocol allows inconsistent copies of data to exist and prevents stale data from being used erroneously by monitoring the tag bits and the ACK/NACK/HIT bits. Under appropriate conditions, a copy of the most recent data block may be transferred from one cache to another without updating the main memory. When a memory operation could lead to a situation where cache coherence can no longer be maintained, the main memory is updated with the most recent copy of the data, and the other caches are either updated or tagged as invalid. Another significant patent is the "Method and apparatus for indexing, accessing and updating a memory." This invention provides a method and apparatus for accessing a selected entry in a first memory using an index formed by combining an index and a stored backpointer of a second memory's entry corresponding to the selected entry in the first memory.

Career Highlights

Brian K Langendorf has made significant strides in the field of computer technology through his work at Prime Computer Inc. His innovative approaches have contributed to advancements in

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