Physical layer circuit and interface circuit

Details Physical layer circuit and interface circuit Physical layer circuit and interface circuit

2008-03-18

2008-03-18

Patel, Ajit (Department: 2616)

Multiplex communications

Channel assignment techniques

Details of circuit or interface for connecting user to the...

Reexamination Certificate

active

10501820

ABSTRACT:
The invention deals with a physical layer circuit for the IEEE1394 bus. Considered is a scenario where two clusters of 1394 devices are linked to each other by means of a wireless bridge. The devices of one cluster shall communicate with devices of the other cluster without being bridge aware. Under this scenario there are two different types of 1394 devices existing in each cluster. One device is a bridge portal and will have the bridge functionality. All the other 1394 devices in the cluster will not have the bridge functionality. As the device having the bridge functionality needs to have a specific buffer memory for buffering node-ID packets, usually there are two different types of physical layer circuits required for the different types of 1394 devices. The invention deals with the problem of how it can be realized to use in both different types of 1394 devices the same type of physical layer circuit. The invention solves the problem by means of configuration means in the physical layer circuit. These configuration means enable either to configure the physical layer circuit as a bridge portal physical layer circuit supporting the bridge functionality by buffering said node-ID packets in said buffer memory or else configuring the physical layer circuit as a standard physical layer circuit that disables the buffering of said node-ID packets. The new type of physical layer circuit is pin compatible with a standard physical layer circuit.

REFERENCES:
patent: 2005/0012399 (2005-01-01), Yoshida
patent: 2005/0047352 (2005-03-01), Burdin et al.
patent: 2006/0017811 (2006-01-01), Mizutani
patent: 1134937 (2001-09-01), None
patent: 2786355 (2000-05-01), None
Search report dated Feb. 18, 2003.

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