Apple Xserve G5 Spezifikationen PDF herunterladen (Seite 31)

This chapter describes the Xserve G5’s built-in I/O devices and the ports for connecting external I/O

devices. Each of the following sections describes an I/O port or device.

USB Ports

The Xserve G5 has two external Universal Serial Bus (USB) 2.0 ports. The USB ports are off of the USB

controller connected to the PCI bus, bridged by K2. All USB ports are fully compliant with the USB

2.0 specification, including support for high-speed (480 Mbps) devices using an Enhanced Host

Controller Interface (EHCI). Ports are automatically routed to a companion Open Host Controller

Interface (OHCI) controller when a classic-speed (full-speed or low-speed) USB device is attached to

a root hub port.

For low-speed and full-speed devices, the USB register set complies with the OHCI specification. For

high-speed devices, the USB register set complies with the EHCI specification.

For more information about USB, refer to sources listed in “USB Interface” (page 48).

USB Connectors

The USB ports use USB Type A connectors, which have four pins each. Two of the pins are used for

power and two for data. Figure 3-1 (page 31) shows the connector and Table 3-1 (page 32) shows the

signals and pin assignments.

Figure 3-1 USB connector

USB Ports 31

CHAPTER 3

Input and Output Devices

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Apple Xserve G5 Spezifikationen Seite 31