US 6,275,473 B1Granted

Bus management method

AssigneeSony Corporation

InventorsKatsumi Matsuno, Ichiro Kubota, Minobu Hayashi, Hisato Shima

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Abstract

A bus management node 11 has a register for channels in use REG1 and a bus capacity register REG2. Before starting the synchronous communication, each node 12 transmits a read-out command to the register for channels in use REG1 in order to read out their contents for ascertaining the number of the un-used channel and the residual capacity. If there is any un-used channel and any residual bus capacity, the node 12 transmits write commands to these registers REG1 and REG2 so that the number of the channel to be in use and the capacity of the bus to be in use will be stored in the register for channels in use REG1 and the bus capacity register REG2. This enables bus management to be achieved easily in a system performing synchronous communication between plural nodes connected to the bus.

Claims6

Dependent claims

A method for managing a communication system having a bus and a plurality of devices, each of said devices having at least one port and wherein at least one device has a storage device for storing channel state information and bus state information, comprising the steps of:

reading said channel state information and said bus state information from said storage device to establish a communication between at least two of said plurality of devices on said bus;
determining whether said communication can be established between said at least two devices based upon the read channel state information and the read bus state information read from said storage device;
and
updating in said storage device said channel state information and said bus state information if it is determined that said communication can be established;
wherein said updating step comprises the steps of:
comparing the read channel state information and the read bus state information with said channel state information and said bus state information in said storage device respectively to detect
if the read channel state information and the read bus state information are identical to said channel state information and said bus state information in said storage device respectively;
writing new channel state information and new bus state information in said storage device respectively if the read channel state information and the read bus state information are identical to said channel state information and said bus state information in said storage device respectively.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/351,390Filed 13 Jul 1999 · continuation
Priority: JP 5-20005519 Jul 1993
Granted: 14 Aug 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H04L 12/407
Bus networks: with decentralised control
H04L 12/40013
Architecture of a communication node: details regarding a bus controller
H04L 12/40032
Architecture of a communication node: details regarding a bus interface enhancer
H04L 12/40058
High-speed IEEE 1394 serial bus: isochronous transmission

Family

Application08/403,708Parent of this continuation · filed 20 Apr 1995
Application08/819,021Parent of this continuation · filed 17 Mar 1997
Application08/988,118Parent of this continuation · filed 10 Dec 1997
US 5,995,489 AParent of this continuation
US 5,978,360 AParent of this continuation
US 6,275,473 B1This patent

From the US filing history. Foreign family members aren’t listed.