Shared auto-negotiation logic for multiple port network devices

Details Shared auto-negotiation logic for multiple port network devices Shared auto-negotiation logic for multiple port network devices

1996-12-30

1999-03-16

Hsu, Alpus H.

Multiplex communications

Channel assignment techniques

Using a separate control line or bus for access control

370447, 370449, 370462, H04L 12413

Patent

active

058838945

ABSTRACT:
A device interconnects across links, a plurality of terminals having respective modes of operation. The device includes a plurality of ports for connection to respective links, and logic coupled to the plurality of ports to exercise an auto-negotiation protocol with terminals coupled to the respective links to resolve modes of operation. The logic includes a shared unit for executing the auto-negotiation protocol, and an arbiter unit for arbitrating among the plurality of ports for use of the shared unit. The arbiter connects ports in the plurality of ports to the shared unit in a round robin sequence. Memory stores a set of status signals for respective ports. The arbiter logic polls the memory to read the set of status signals in sequence, and in response enables use of the shared auto-negotiation unit by the ports. The modes of operation resolved by the shared auto-negotiation unit include LAN technology supported by terminals on the corresponding links, such as IEEE 802.3 Local Area Network technologies.

REFERENCES:
patent: 5311114 (1994-05-01), Sambamurthy
patent: 5432775 (1995-07-01), Crayford
patent: 5546385 (1996-08-01), Caspi et al.
patent: 5586117 (1996-12-01), Edem et al.
patent: 5610903 (1997-03-01), Crayford
patent: 5617418 (1997-04-01), Shirani et al.
"Physical Layer Link Signaling for 10 Mb/s and 100 Mb/s Auto-Negotiation on Twisted Pair", IEEE, pp. 235-280 (1995).

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