The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 21, 2003
Filed:
Sep. 16, 1998
Tomoki Saito, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A physical layer interface for an IEEE-1394 serial bus node includes multiple port transceivers connected to respective serial buses. A controller, connected to a link layer and the port transceivers, supplies control signals to an encoder/decoder for performing data conversion between the link layer and the port transceivers and to a repeater for repeating bus traffic between the port transceivers. A speed setting circuit is provided for storing a lowest value of transmission speeds of the port transceivers in a register map of the controller as a top speed of the node. The controller is arranged to read the stored speed value from the register, receive a speed value from another node and begin packet transmission at a lower one of the stored and received speed values.