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:
Dec. 13, 2005
Filed:
Feb. 22, 2001
William P. Brandt, Groton, MA (US);
Kenneth H. Potter, Raleigh, NC (US);
Jonathan Rosen, Cary, NC (US);
William P. Brandt, Groton, MA (US);
Kenneth H. Potter, Raleigh, NC (US);
Jonathan Rosen, Cary, NC (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A mapping technique allows a forwarding engine of an intermediate node to efficiently compute a starting address within an internal packet memory (IPM) configured to hold a packet received at the node. The starting address is used by direct memory access logic to merge a trailer of the packet stored in the IPM with a modified packet header generated by the forwarding engine. However, the size of the IPM is preferably not a binary number that can be easily manipulated by the forwarding engine when computing the starting address of the packet within the IPM. Therefore, the technique automatically adjusts the starting address to map to a correct location if the address exceeds the size of the IPM, while obviating the need for the forwarding engine to consider a wrap-around condition when computing the starting address.