Universal Serial Bus (Usb) Controller - HP Net Vectra Technical Reference Manual

Hp net vectra: reference manual

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2 System Board

Devices on the PCI Bus

Universal Serial Bus (USB) Controller

The OpenHCI USB controller (USB release 1.0) is implemented as part of

the Bridge chip. It is driven from the PCI bus, and provides support for the

two stacked USB connectors on the back panel. Over-current detection and

protection is provided, but shared between the two ports. The specification

is as follows:

• 12 M bps (bits per second) transfer rate

• Supports up to 127 devices (maximum)

• Isochronous and asynchronous data transfer support

• Up to 5 m per cable segment

• Built in power distribution

• Supports daisy-chaining through a tiered-star, multi-drop topology (up to

6 tiers)

USB works only if the USB interface has been enabled within the HP Setup

program. Currently, only the Microsoft Windows 95 operating system

provides support for the USB.

The Microsoft Supplement 2.1 software, which provides support of the

Universal Serial Bus, can be obtained from the Hewlett-Packard World Wide

Web site:

http://www.hp.com/go/vectrasupport/

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