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:
Sep. 16, 2003
Filed:
May. 30, 2000
Thomas Brune, Hannover, DE;
Ralf Ostermann, Hannover, DE;
Jens Cahnbley, Reinstorf/Suelbeck, DE;
Siegfried Schweidler, Gehrden, DE;
Thomson Licensing S.A., Boulogne, FR;
Abstract
The IEEE1394 bus communication protocol has three layers: physical layer, link layer, and transaction layer. A link layer IC implements the interface to an external application and prepares data for sending on the bus, or interprets incoming data packets from the IEEE1394 bus. A physical layer IC implements the direct electrical connection to the bus and controls many functions including arbitration for sending data on the bus. A problem exists due to the fact that the header data of the IEEE1394 asynchronous data packets consists of 32 bit words which have to be interpreted as 32 bit words in the connected application data processing unit ( ). The IEEE1394 bus interface unit ( ) is defined to be of big endian type. In a little endian type application data processor ( ) the data word order can only be correctly interpreted after a byte order change. According to the invention the byte order change is performed in the data link layer unit ( ) automatically with hardware circuitry for asynchronous data packets.