Extension of USB functionality through shadowing of a remote USB host controller

Abstract

A KVM extension configuration that includes a host connected to a transmitter for transmitting communication signals across a KVM extension to a receiver where user interface devices are located. The host has a motherboard that supports USB communications. The KVM extension configuration includes a USB host controller at the receiver that initiates data reads and writes to the host as delayed transactions and supports USB protocol communication with a plurality of the user interface devices. The configuration also includes a transmitter core in the transmitter having shadow registers that include content that is copied from the configuration registers of the USB host controller at the receiver. The host successfully carries out USB communications with the transmitter through the use of the content of the shadow registers. In addition, the receiver periodically synchronizes the content of the shadow registers with content from the configuration registers of the USB host controller.

Dependencies are inferred from the claim text.