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Tier Based Bandwidth Calculation for devices Connected either directly or through hubs to USB 2.0 Host Controller.

IP.com Disclosure Number: IPCOM000021779D
Original Publication Date: 2004-Feb-09
Included in the Prior Art Database: 2004-Feb-09

Publishing Venue

IBM

Abstract

Disclosed is a design to improve the performance of USB 2.0 Host Controller (HC) by Tier based Bandwidth Calculation. Traditionally, for devices residing anywhere in the USB topology, the worst case delay is taken into account for Bandwidth Calculation. This becomes an overhead if the devices are connected directly to the HC Ports. A new method is disclosed here, wherein a device residing on different location in the bus topology, the bandwidth is calculated by tier based delay from the HC till the point where the device resides.