
Package Information
May 2005
Intel IXP45X and Intel IXP46X Product Line of Network Processors Datasheet
84
Document Number: 306261-002
USB_HNEG
Z
VB
I/O
Negative signal of the differential USB receiver/driver for the USB host interface.
NOTE:
This pin requires an 20
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-K
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_HPEN
Z
VO
O
Enable to the external VBUS power source
USB_HPWR
Z
VI
I
External VBUS power is in over current condition
When this interface/signal is enabled and is not being used in a system design, the interface/signal
should be pulled high with a 10-K
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.
Table 22.
Oscillator Interface
Name
Power
on
Reset
Normal
After
Reset
Until
Software
Enables
Normal
After
Software
Enables
Type
Description
OSC_IN
n/a
VI
I
33.33-MHz, sinusoidal input signal. Can be driven by an oscillator.
OSC_OUT
n/a
VO
O
33.33-MHz, sinusoidal output signal. Left disconnected when being driven by an oscillator.
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,
Table 21.
USB Host/Device Interfaces (Sheet 2 of 2)
Name
Power
on
Reset
Normal
After
Reset
Until
Software
Enables
Normal
After
Software
Enables
Type
Description
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 14.
For a legend of the Type codes, see Table 10 on page 46.
Please refer to the Intel
IXP45X and Intel IXP46X Product Line of Network Processors Hardware Design Guidelines for additional board design details.