Bus network

About: Bus network is a research topic. Over the lifetime, 7017 publications have been published within this topic receiving 97556 citations.

Bus-to-bus bridge for optimising data transfers between a system bus and a peripheral bus

Abstract: The present invention provides hardware logic within a host bridge 20 that connects a system bus 36 to a peripheral bus 22 using PCI bus architecture or a peripheral bus that uses a bus architecture similar to PCI. The inventive hardware optimizes the speed at which data transfers are accomplished between the buses while translating the data transfers between the different architectures of the two buses.

Fault-tolerant power supply system

Abstract: A power supply system for use in a fault-tolerant computer having a main bus interconnecting several main bus elements, with at least one of the elements being capable of transmitting commands and receiving status information. The system includes a status bus which is coupled to the main bus. A control unit is associated with each bus element, such control unit including a voltage regulator connected to a primary source of power for providing regulated voltage to the associated bus element in response to commands received over the status bus from the main bus. The primary power source preferably includes redundant power supplies which provide voltage which is distributed over a pair of redundant voltage buses. Apparatus for sensing when a main bus element has seized the main bus may be included so that the bus element can be commanded by way of the status bus to release the main bus.

Network system using token-passing bus with multiple priority levels

Abstract: A network system using a token-passing bus access method, comprising bus type transmission path, nodes for executing a priority processing algorithm based on a standard of an IEEE 802.4 token-passing bus, common memories respectively included in the plurality of nodes and each having a mutually common address structure, and communication circuits, respectively included in said plurality of nodes, for communicating storage contents among the common memories through the transmission path in accordance with priority levels of the priority processing algorithm.

Quantitative Comparison of the Error-Containment Capabilities of a Bus and a Star Topology in CAN Networks

Abstract: There has been an increasing interest in using star topologies in field-bus communications, e.g., in Time Triggered Protocol for SAE classC applications (TTP/C), FlexRay, or controller area network (CAN), due to increased fault resilience and potential error-containment advantages. In this context, an innovative CAN-compliant star topology, CANcentrate, has been developed, whose hub includes enhanced fault-treatment mechanisms. However, despite this interest toward stars, it is still necessary to quantify their real dependability benefits. For this purpose and for the particular case of CAN, this paper presents models for the dependability features of CAN and CANcentrate using Stochastic Activity Networks (SANs). It quantitatively compares their reliability and error-containment capabilities under permanent hardware faults. These models rely on assumptions that ensure that results are not biased toward CANcentrate, which, in some cases, is too detrimental for it. Thus, despite not reflecting the full CANcentrate potential, results quantitatively confirm the improvement of error-containment it achieves over CAN. Additionally, the way in which the nodes' ability to contain their own errors affects the relevance of using a star topology has been quantified. Although this paper refers to the case of CAN, conclusions regarding the justification of using a star topology depending on this ability can be extrapolated to other field-bus technologies.

Data Sensor Coordination Using Time Synchronization in a Multi-Bus Controller Area Network System

Abstract: A method is provided for synchronizing time in an unsynchronized vehicle controller area network system. A master control unit receives a global time from a time synchronization source. The master control unit estimates a respective time delay in transmitting messages by electronic control units on each controller area network bus. The time delay is a difference between a time when a message is generated by a respective electronic control unit for transmission on a respective controller area network bus and a time when the message is transmitted on the respective controller area network bus. The global time is adjusted for each respective controller area network bus based on the estimated time delays associated with each respective controller area network bus. Global time messages from the master control unit are transmitted to each electronic control unit that include the adjusted global times for an associated controller area network bus.