APPARATUS AND METHOD FOR CONTROLLING THE NUMBER OF LANES USED FOR TRANSFERRING DATA BETWEEN INFORMATION PROCESSING APPARATUSES

摘要

First and second apparatuses are connected with each other through a communication path provided with a plurality of lanes used for data transfer that is performed between the first and second apparatuses. Prior to data transfer, transfer-control information is exchanged between the first and second apparatuses according to a predetermined communication protocol. Upon detecting transfer-control information, the first apparatus notifies the second apparatus of a lane-control instruction to increase a second lane-counter indicating a number of lanes used by the second apparatus, and increases a first lane-counter indicating a number of lanes used by the first apparatus so that the first lane-counter is greater than a number of lanes that have been used when detecting the transfer-control information. Upon detecting the lane-control instruction, the second apparatus increases the second lane-counter so that the second lane-counter is greater than a number of lanes that have been used when detecting the instruction.

主权项

1. An information processing system comprising:
a first apparatus; and a second apparatus, wherein the first apparatus and the second apparatus are connected with each other through a communication path provided with a plurality of lanes used for transferring data between the first and second apparatuses; the first apparatus is configured:
to detect transfer-control information prior to data transfer that transfers data between the first and second apparatuses, the transfer-control information being exchanged, prior to the data transfer, between the first and second apparatuses, according to a predetermined communication protocol,to notify the second apparatus of a lane-control instruction to increase a second lane-counter indicating a number of lanes used by the second apparatus, andto increase a first lane-counter indicating a number of lanes used by the first apparatus so that the first lane-counter is greater than a number of lanes that have been used when detecting the transfer-control information; and the second apparatus is configured to, upon detecting the lane-control instruction to increase the second lane-counter notified from the first apparatus, increase the second lane-counter so that the second lane-counter is greater than a number of lanes that have been used when detecting the instruction.