Data bus for a plurality of nodes

• US 6,784,569 B1
• Filed: 09/11/2000
• Issued: 08/31/2004
• Est. Priority Date: 03/10/1998
• Status: Expired due to Term

• Current Assignee: BMW AG (Bayerische Motoren Werke AG)
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Peller, Martin
• Primary Examiner(s): DEBERADINIS, ROBERT L
• Application Number:
  US09/623,897
• Time in Patent Office: 1,450 Days
• Field of Search: 307/106, 375/229, 375/232, 375/233, 398/62, 385/100
• US Class Current: 307/106
• CPC Class Codes: G06F 13/4022 using switching circuits, e.g. switching matrix, connection or expansion network G06F13/4009 takes precedence
• CPC Class Codes: H04L 12/44 Star or tree networks
• CPC Class Codes: H04L 7/044 using a single bit, e.g. start stop bit

Abstract

A data bus arrangement and method for connecting a plurality of nodes to one another through a star coupler arrangement of a data bus which uses a logical decision gate having a plurality of inputs corresponding to said plurality of nodes wherein the logical decision gate inputs receive electrical signals and outputs an electrical signal to be routed back to each of said plurality of nodes. Some of the nodes are connected through opt0-electric transducers to the inputs of the logical decision gate. These transducers convert optical input signals from the nodes to electric signals to the inputs of the logical decision gate and also convert the output from the logical decision gate back to optical signals to the nodes. A signal conditioning circuit modifies the output signal of the logical decision gate.

Claims

1. A data bus arrangement for connecting a plurality of nodes to one another, said arrangement comprising:

a logic decision gate having a plurality of inputs for receiving a corresponding plurality of first electrical signals routed from said plurality of nodes wherein an output of the logical decision gate is connected in parallel to provide second electrical output signals routed to each of said plurality of nodes;

a plurality of opto-electrical transducers, each of said plurality of opto-electrical transducers connected between one of said nodes and one of said inputs of said logic decision gate wherein the output of said logic decision gate is fed to an electrical input of said each said opto-electrical transducers;

a signal conditioning circuit arranged between said logical decision gate and the inputs of said nodes in order to provide a pulse shaping function for the output signal of said logical decision gate.

2. The data bus arrangement according to claim 1, wherein said signal conditioning circuit modifies the output signal of the decision gate in order to compensate for distortion generated by said opto-electric transducers.

3. A method for connecting a plurality of nodes to one another through a data bus configuration, said method comprising the steps of:

routing each of a plurality of outputs from said plurality of nodes to an input of a plurality of inputs of a logic decision gate wherein at least one of said outputted routed signals is fed through an opto-electric transducer to provide an electric signal to at least one input of said logic decision gate;

outputting a signal said logic decision gates and routing said output signal to an input of each of said plurality of nodes;

performing signal conditioning on said output signal of said logic decision gate in order to shape the pulse of said output signal in order to compensate for distortion in each of said opto-electric transducers when converting between optical and electrical signal.

4. The method according claim 3, wherein the signal conditioning adapts the pulse shape of the output signal of the decision gate to the pulse shape of input signals to said transducers.