Output port determining apparatus

Details Output port determining apparatus Output port determining apparatus

2003-04-02

2008-12-09

Hafiz, Tariq R. (Department: 2184)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output access regulation

C709S238000

Reexamination Certificate

active

07464200

ABSTRACT:
An output port determining apparatus is capable of determining a longest match for a network address without the necessity of processing operations in memory devices. Output ports are connected to networks. An address bus has signal lines corresponding to bits of a node address which uniquely identifies a node as a connection destination. A plurality of memory devices are connected to as many the signal lines as the number of bits of network addresses of the networks, and store port information representing the output ports to output data therefrom at memory addresses corresponding to the network addresses. An address register outputs a received node address to the address bus. A selecting circuit selects the port information stored in one of the memory devices which is connected to the most signal lines, from port information outputted from the memory devices according to the node address, and outputs the selected port information.

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