Method for autonegotiating multiple devices with a shared autonegotiation controller

• US 6,883,025 B2
• Filed: 12/07/2001
• Issued: 04/19/2005
• Est. Priority Date: 06/05/1998
• Status: Expired due to Term

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: LSI Logic Corporation (Broadcom, Inc.)
• Inventors: Andra, Sateesh, Channabasappa, Shankar
• Primary Examiner(s): Thompson, Marc D.
• Application Number:
  US10/021,511
• Publication Number:
  US 20020046267A1
• Time in Patent Office: 1,229 Days
• Field of Search: 709/220, 709/223, 709/224, 709/227, 709/228, 709/237, 709/247, 370/365, 370/438, 370/445, 370/465
• US Class Current: 709/220
• CPC Class Codes: H04L 12/40032 Details regarding a bus interface enhancer
• CPC Class Codes: H04L 12/40136 Nodes adapting their rate to the physical link properties LAN switches H04L49/351
• CPC Class Codes: H04L 12/40163 by assigning priority to messages according to a message field
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]

Abstract

A multiple channel communication system includes a plurality of network communication ports, a plurality of communication devices and an autonegotiation controller. Each communication device is coupled to a respective one of the plurality of network communication ports. The autonegotiation controller is coupled to and shared by the plurality of communication devices.

Claims

1. A method of autonegotiating communication configuration information through a plurality of communication devices with a shared autonegotiation controller in a multiple channel communication system, the method comprising:

prior to initiating autonegotiation for a first of the plurality of communication devices, ceasing network communication to cause the plurality of communication devices to recognize a link_fail condition;

autonegotiating between the multiple channel communication system and the first of the plurality of communication devices;

determining whether a second of the plurality of communication devices changed status during autonegotiation of the first of the plurality of communication devices; and

autonegotiating between the multiple channel communication system and the second of the plurality of communication devices without ceasing network communication with the second of the plurality of communication devices if the status of the second of the plurality of network communication devices did not change during autonegotiation of the first of the plurality of network communication devices.

2. The method of claim 1 wherein ceasing network communication comprises ceasing network communication for an interval corresponding to break_link_timer.

3. The method of claim 2 wherein the duration of break_link_timer is an interval between about 1200 milliseconds and about 1500 milliseconds.

4. A method of sequentially autonegotiating a plural number of ports with a shared autonegotiation controller, the method comprising:

steps for autonegotiating the plural number of ports; and

steps for initiating a break_link_timer a number of iterations that is less than the plural number of ports.

5. A method for autonegotiating communication configuration information through a plurality of communication devices utilizing a shared autonegotiation controller, the method comprising:

ceasing network communication between a shared autonegotiation controller and a first network device in order to cause the first network device to recognize a link _fail condition;

autonegotiating communication information between the autonegotiation controller and the first network device; and

selectively ceasing network communication between the autonegotiation controller and the second network device due to a change of status of the second network device during autonegotiation of the first network device.