82801DB datasheet(45/587 Pages) INTEL

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Intel® 82801DB ICH4 Datasheet

Signal Description

2.9

USB Interface

Table 2-9. USB Interface Signals

Name

Type

Description

USBP0P,

USBP0N,

USBP1P,

USBP1N

I/O

Universal Serial Bus Port 1:0 Differential: These differential pairs are used to

transmit data/address/command signals for ports 0 and 1. These ports can be

routed to USB UHCI controller #1 or the USB EHCI controller.

NOTE: No external resistors are required on these signals. The Intel® ICH4

integrates 15 k

Ω pull-downs and provides an output driver impedance

of 45

Ω which requires no external series resistor

USBP2P,

USBP2N,

USBP3P,

USBP3N

I/O

Universal Serial Bus Port 3:2 Differential: These differential pairs are used to

transmit data/address/command signals for ports 2 and 3. These ports can be

routed to USB UHCI controller #2 or the USB EHCI controller.

NOTE: No external resistors are required on these signals. The ICH4

integrates 15 k

Ω pull-downs and provides an output driver impedance

of 45

Ω which requires no external series resistor

USBP4P,

USBP4N,

USBP5P,

USBP5N

I/O

Universal Serial Bus Port 5:4 Differential: These differential pairs are used to

transmit data/address/command signals for ports 4 and 5. These ports can be

routed to USB UHCI controller #3 or the USB EHCI controller.

NOTE: No external resistors are required on these signals. The ICH4

integrates 15 k

Ω pull-downs and provides an output driver impedance

of 45

Ω which requires no external series resistor

OC[5:0]#

Overcurrent Indicators: These signals set corresponding bits in the USB

controllers to indicate that an overcurrent condition has occurred.

USBRBIAS

USB Resistor Bias: Analog connection point for an external resistor to ground.

USBRBIAS should be connected to USBRBIAS# as close to the resistor as

possible.

USBRBIAS#

USB Resistor Bias Complement: Analog connection point for an external

resistor to ground. USBRBIAS# should be connected to USBRBIAS as close to

the resistor as possible.

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