Bus system and relay device

Abstract

The purpose of the present invention is to determine the necessary bus bandwidth for a performance guarantee for requested performance differing for each piece of traffic transmitted on a network-on-chip (NoC) bus without over-estimating, and furthermore increase the usage efficiency of the surplus bandwidth thereof. In a NoC bus system, data is transmitted between a first node and a second node via a relay device. The data includes performance guarantee data that guarantees at least one of throughput and permitted delay time. The first node generates a plurality of packets that include the transmitted data as well as identification information for identifying the requested performance for the transmitted data, and controls the transmission of the plurality of packets. The relay device includes a buffer unit that separates received packets with respect to each requested performance on the basis of the identification information and stores the separated packets, and a relay control unit that controls the transmission of each packet stored in the buffer unit by using a transmission rate greater than or equal to the total value of all transmission rates that the first node should guarantee corresponding to each piece of identification information.

Description

technical field [0001] The present invention relates to a technique for controlling a communication bus in a bus system equipped with a networked communication bus (distributed bus) provided on a semiconductor integrated circuit. Background technique [0002] NoC (Network-on-Chip; Network on Chip) is a networked communication bus provided on a semiconductor chip which is an integrated circuit of a semiconductor. In the NoC, the bus is connected by a repeater (router), and the same bus is used to transfer traffic sent from a plurality of hosts. Thereby, the number of buses can be reduced, and the buses can be efficiently used. [0003] However, in the NoC, since the bus is shared among the traffic of a plurality of hosts, performance guarantee (throughput guarantee and delay guarantee) becomes difficult. [0004] Multiple hosts independently run services requiring different performance. Therefore, in the same bus, for example, services that want to be transmitted with a sh...

AI Technical Summary

Problems solved by technology

As a result, there is a problem that high priority traffic can be affected by interference from low priority traffic

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