Bus system and computer program

A non-transitory computer readable medium storing a computer program which is executed by a computer for calculating a priority of transmission to be set in a bus system for a semiconductor circuit, in which a plurality of data are transmitted on a networked bus between a first node and at least one second node via a relay device arranged on the bus, wherein:

• the bus system includes a first bus having a first delay and a second bus, different from the first bus, having a second delay, the second delay being longer than the first delay;
• the computer program causes the computer to execute:
• a step of receiving a priority conversion rule for converting a priority to a priority determined based on a transmission delay of the second bus, and an input of information of a predetermined priority;
• and
• a step of calculating a priority of transmission at the relay device based on the predetermined priority and the priority conversion rule,
• wherein for a packet to be transmitted via the bus having the second delay, the priority conversion rule converts the priority so that the priority becomes higher, and
• wherein for a packet not to be transmitted via the bus having the second delay, the priority conversion rule converts the priority so that the priority becomes lower.

A bus system for a semiconductor circuit, in which data is transmitted on a networked bus between a first node and a second node via at least one relay device arranged on the bus, wherein:

• the second node has a processing capacity relatively lower than the relay device;
• the first node and the relay device are connected together via a first bus;
• the relay device and the second node are connected together via a second bus;
• a first classification is defined on the first bus whereby packets are processed by the unit of classes each representing a rigidness of a quality requirement, whereas a second classification is defined on the second bus whereby packets are processed by the unit of the first node;
• the first node includes:
• a first buffer for storing the data;
• and
• a packet generator circuit for generating a plurality of packets by attaching, to the data stored in the buffer, a class specifying a priority of transmission at the relay device;
• and
• the relay device includes:
• a buffer manager circuit for receiving the plurality of packets via the first bus;
• a second buffer for storing the received packets;
• a priority converter circuit for performing a priority process of identifying a first node of a sender of the plurality of packets and converting from the packet process by the unit of classes to the packet process by the unit of the first node;
• and
• a sending controller for sending the data via the second bus in a descending order of the converted priority, which indicates the order in which packets are sent.

A bus system for a semiconductor circuit, in which data is transmitted on a networked bus between a first node and a second node via a plurality of relay devices arranged on the bus, wherein:

• the second node has a processing capacity relatively lower than the relay device;
• the bus system includes an outward path and a return path, independent of each other, as paths along which packets are transmitted;
• the first node and the relay device are connected together via a first bus of the outward path;
• the relay device and the second node are connected together via a second bus of the outward path;
• a first classification is defined on the first bus whereby packets are processed by the unit of classes each representing a rigidness of a quality requirement, whereas a second classification is defined on the second bus whereby packets are processed by the unit of the first node;
• a first relay device is arranged between the first bus and the second bus;
• the first relay device includes:
• a buffer manager circuit for receiving the plurality of packets via the first bus;
• a first buffer for storing the received packets;
• a priority converter circuit for performing a priority process of identifying a first node of a sender of the plurality of packets and converting from the packet process by the unit of classes to the packet process by the unit of the first node;
• and
• a sending controller for sending the data via the second bus in a descending order of the converted priority, which indicates the order in which packets are sent;
• a second relay device is arranged on the return path;
• and
• the second relay device transmits a plurality of packets from the second node to the first node without distinguishing between priorities of transmission of the plurality of packets.