Bus connecting device for connecting host with external device

摘要

A detecting unit detects a connection of an external device to a connection port and stores the connection in a bridge state storage unit. This setting is autonomously completed by a device before an initial configuration is started by a host. A data transfer unit receives initial configuration data of a link-connection bridge from the host. Data is transferred to the linked-uplink-connection bridge with reference to the bridge state storage unit, data to a bridge which is not linked up is wasted, or an Unsupported Request is returned to the host to represent the absence of the link-connection bridge.

主权项

1. A bus connecting device connecting a host with an external device, comprising:
a bridge for connecting to the external device; a detecting unit for detecting the bridge linked up by connection of the external device before an initial configuration from the host is started in an initial configuration state of a system including the host and the external device, the detecting unit detecting the linked-up bridge by training of links subsequent to a power-on of the system or return from a device reset state; and a setting unit for setting the bridge which is linked up, as a target for an initial configuration from the host.