Frame-structured bus system for transmitting both synchronous an

Details Frame-structured bus system for transmitting both synchronous an Frame-structured bus system for transmitting both synchronous an

1995-12-04

1997-04-15

Shah, Alpesh M.

Multiplex communications

Wide area network

Packet switching

370407, G06F 1300

Patent

active

056218958

ABSTRACT:
A frame-structured bus system, particularly for a local operation network for automotive applications, is disclosed in which a plurality of bus stations share a data bus, and in which one of the bus stations generates a sequence of data frames of constant bit length. Each data frame includes an isochronous frame module and an asynchronous frame module, and the division of each data frame into the isochronous and asynchronous frame modules is dynamically variable. The message transmitted by a station is passed through a central star coupler to all stations. A frame clock is generated by a frame clock generator and sent to the central star coupler, with the time sequence of the data frames of the frame clock defining a reference frame clock, and the other stations of the local operation network determining an individual frame transmit clock, such that the respective message transmitted by a particular station, taking into account the propagation delay to the central star coupler, arrives at the central star coupler at that instant relative to the reference frame clock at which this message has to be inserted into the data frame present in the central star coupler.

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