IXP46X datasheet(71/148 Pages) INTEL

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Package Information

August 2006

Intel® IXP45X and Intel® IXP46X Product Line of Network Processors Datasheet

Document Number: 306261-004US

Table 20.

USB Host/Device Interfaces (Sheet 1 of 2)

Name

Power

Reset†

Normal

After

Reset

Until

Software

Enables

Possible

Configur

ations

After

Software

Enables

Type†

Description

USB_DPOS

I/O

Positive signal of the differential USB receiver/driver for the USB device interface.

Note:

This pin requires an 18Ω external series resistor. This resistor is located after the pin, but before

the pull-down resistor.

When this interface/signal is enabled and is not being used in a system design, the interface/signal

should be pulled low with a 10-KΩ resistor. When this interface is disabled via the USB Device soft fuse

(refer to Expansion Bus Controller chapter of the Intel® IXP45X and Intel® IXP46X Product Line of

Network Processors Developer’s Manual) and is not being used in a system design, this interface/signal

is not required for any connection.

USB_DNEG

I/O

Negative signal of the differential USB receiver/driver for the USB device interface.

Note:

This pin requires an 18Ω external series resistor. This resistor is located after the pin, but before

the pull-down resistor.

When this interface/signal is enabled and is not being used in a system design, the interface/signal

should be pulled low with a 10-KΩ resistor. When this interface is disabled via the USB Device soft fuse

(refer to Expansion Bus Controller chapter of the Intel® IXP45X and Intel® IXP46X Product Line of

Network Processors Developer’s Manual) and is not being used in a system design, this interface/signal

is not required for any connection.

USB_HPOS

I/O

Positive signal of the differential USB receiver/driver for the USB host interface.

Note:

This pin requires an 20Ω external series resistor. This resistor is located after the pin, but before

the pull-down resistor.

When this interface/signal is enabled and is not being used in a system design, the interface/signal

should be pulled low with a 10-KΩ resistor. When this interface is disabled via the USB Device soft fuse

(refer to Expansion Bus Controller chapter of the Intel® IXP45X and Intel® IXP46X Product Line of

Network Processors Developer’s Manual) and is not being used in a system design, this interface/signal

is not required for any connection.

USB_HNEG

I/O

Negative signal of the differential USB receiver/driver for the USB host interface.

Note:

This pin requires an 20Ω external series resistor. This resistor is located after the pin, but before

the pull-down resistor.

When this interface/signal is enabled and is not being used in a system design, the interface/signal

should be pulled low with a 10-KΩ resistor. When this interface is disabled via the USB Device soft fuse

(refer to Expansion Bus Controller chapter of the Intel® IXP45X and Intel® IXP46X Product Line of

Network Processors Developer’s Manual) and is not being used in a system design, this interface/signal

is not required for any connection.

Note:

This table discusses all features supported on the Intel® IXP45X and Intel® IXP46X Product Line of Network Processors. For details on feature support listed by processor,

see Table 1 on page 13.

†

For a legend of the Type codes, see Table 8 on page 43.

††

Please refer to the Intel® IXP45X and Intel® IXP46X Product Line of Network Processors Hardware Design Guidelines for additional board design details.

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