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Apparatus for and method of communicating among devices interconnected on a bus
| Details |
Inventors: Stewart, Brett B.;
Assignee: Advanced Micro Devices, Inc. (Sunnyvale, CA)
Primary Examiner: Nguyen; Chau
Assistant Examiner: Vanderpuye; Kenneth
Attorney, Agent or Firm: Foley & Lardner
An information communication system has a plurality of nodes connected by both an information transmission bus and a signalling channel. The information transmission bus is used to carry messages between devices attached to the nodes of the network. The signing channel is used to signal nodes that a message transmission is about to occur. Based on the devices connected to the nodes, the appropriate communication protocol can be set up and resources allocated on the information transmission bus to efficiently transfer information. The invention allows a device acting as a message source to communicate with another device at a first node using a first protocol and to communicate with a different device at a second node using a second protocol. The protocols can be stored in the devices attached to the nodes or a control node can be used. |
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DETAILED DESCRIPTION In view of the above identified limitations of the related art, it is an object of the invention to provide efficient communication among devices communicatively linked via an information transfer medium or bus by providing access to the information transfer bus to each device without tying up the information transfer bus with access arbitration tasks.
The above and other objects of the invention are accomplished using a separate signalling channel used to exchange communication protocols and resource allocation for particular relationships between communicating devices.
Thus, an information communication system according to the invention includes an information transmission bus and a signaling channel.
A plurality of nodes is communicatively linked by the information transmission bus and the signalling channel.
Predetermined valid communications among selected ones of the nodes are set up by the nodes in accordance with preselected transmission characteristics compatible among the nodes.
The nodes set up the preselected transmission characteristics in response to a signal transmitted from one of the selected nodes on the signalling channel.
The preselected transmission characteristics can include carrier frequencies on the information transmission bus, modulation characteristics, bandwidth allocation, allocations of other resources or any combination thereof.
According to the invention, the protocol information can be transmitted from a source to a destination node over the signalling channel at the time the need for the transmission is determined.
Alternatively, in another embodiment, the communication protocols can be pre-defined and stored in an active list for each node at net initialization.
In still another embodiment, at net initialization, each device can broadcast its identifier and its protocol to the other devices, which store the protocol information.
In these last two embodiments, it is only necessary for the destination device to read an identification code of the source device and then retrieve the information from a memory storing the protocol information
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