Electrical computers and digital processing systems: memory – Address formation – Combining two or more values to create address
Reexamination Certificate
2005-12-13
2005-12-13
Moazzami, Nasser (Department: 2187)
Electrical computers and digital processing systems: memory
Address formation
Combining two or more values to create address
C711S209000
Reexamination Certificate
active
06976149
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.
REFERENCES:
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U.S. Appl. No. 09/791,063, Rachepalli et al.
U.S. Appl. No. 09/791,074, Potter et al.
Cisco 7200 and NPE Hardware Overview, Cisco Systems, Inc. 1999, pp. 1-35.
Brandt William P.
Potter Kenneth H.
Rosen Jonathan
Cesari and McKenna LLP
Moazzami Nasser
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