US 6,788,698 B1 · Data switching apparatus and data switching method

Abstract

It is an object of the present invention to provide a data switching method capable of impartially selecting a plurality of input ports by a simple circuit configuration. The data switching method according to the present invention includes an up-counter, a down-counter, a counter selecting circuit for selecting either of a counted value by the up-counter or a counted value by the down-counter, a port selecting circuit for selecting one of a plurality of input ports based on an output from the counter selecting circuit, and a buffer for accumulating a packet supplied from the input port selected by the port selecting circuit. The port selecting circuit alternately selects the up-counter and the down-counter to switch the ascending order and the descending order of the import priority of the input ports at every time the packet is imported, thereby impartially selecting each of the input ports.

Claims20

Dependent claims

A data switching apparatus for selecting any of a plurality of input ports and accumulating data imported from the selected input port in a buffer connected to an output port, comprising:

priority setting means for setting a data import priority of a plurality of said input ports;
and
port selecting means for switching the selection of a plurality of said input ports in accordance with the set data import priority,
wherein said priority setting means set a new data import priority without depending on a data import priority of a plurality of said input ports in a immediately previous data import timing so that said port selecting means impartially selects a plurality of said input ports.

1 more element

A data switching method for selecting any of a plurality of input ports and accumulating data imported from the selected input port in a buffer connected to an output port, said method comprising the steps of:

setting a data import priority of a plurality of said input ports;
and
switching the selection of a plurality of said input ports in accordance with the set data import priority,
wherein said step of setting the priority sets a new data import priority so that a plurality of said input ports are impartially selected by said step of switching the selection of said input ports without depending on a data import priority of a plurality of said input ports in a previous data import timing.

1 more element

Dependencies are inferred from the claim text.

Data switching apparatus and data switching method

Life of this patent

Data switching apparatus and data switching method

Life of this patent

Abstract

Claims20