Bridge, information processing device , and access control method

An information processor comprising:

• a processor unit;
• a peripheral device;
• and
• a bridge connecting the processor unit and the peripheral device, wherein
• the bridge comprises:
• a downstream port connected to the peripheral device;
• and
• a router operative to route access from the peripheral device to a memory of the processor unit via the downstream port, to upstream channels each assigned a memory bandwidth available for access to the memory of the processor unit, the upstream channels being virtual channels supported by the processor unit, wherein
• the downstream port supports a plurality of downstream channels provided used for the access by the peripheral device, the downstream channels being virtual channels provided for interfacing with the peripheral device,
• the router is provided with a table storing identifiers of the downstream channels and identifiers of the upstream channels in association with each other, and refers to the table so as to allocate to the peripheral device the upstream channel corresponding to the downstream channel used by the peripheral device, in response to the access from the peripheral device, and
• the processor unit is provided with an access controller operative to route the access, to which one of the upstream channels is allocated, to the memory at the memory bandwidth allocated to the upstream channel.