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Improving the Performance of the USB 2.0 Host Controller by Effective Port Sharing Mechanism for Devices residing on different Root Hub Ports

IP.com Disclosure Number: IPCOM000030397D
Original Publication Date: 2004-Aug-10
Included in the Prior Art Database: 2004-Aug-10

Publishing Venue

IBM

Abstract

Disclosed is a design to improve the performance of USB2.0 Host Controller (HC) by effective Root Hub (RH) port sharing mechanism for Isochronous transfer. When multiple devices are connected to different ports of the Root Hub, for a given data payload and for an Isochronous IN transaction (Device to Host Transfer) on port Pn, the bandwidth for devices residing on ports other than port Pn is wasted when a transaction error is encountered in the received data packet. This paper explains about effective utilization of bandwidth by port sharing mechanism.