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Intel
®
IXP45X and Intel
®
IXP46X Product Line of Network Processors
February 2007 HDD
Document Number: 305261; Revision: 004 45
General Hardware Design Considerations—Intel
®
IXP45X and Intel
®
IXP46X Product Line of
Network Processors
Table 18. High-Speed, Serial Interface 1
Name
Input
Output
Pull
Up
Down
Recommendations
HSS_TXFRAME1 I/O Yes
Transmit frame.
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-KΩ resistor.
HSS_TXDATA1 OD Yes
Transmit data out. Open Drain output.
When this interface/signal is enabled and is either used or not used in a system design,
the interface/signal should be pulled high with a 10-KΩ resistor to V
CCP
.
HSS_TXCLK1 I/O Yes
Transmit clock.
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-KΩ resistor.
HSS_RXFRAME1 I/O Yes
Receive frame.
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-KΩ resistor.
HSS_RXDATA1 I Yes
Receive data input.
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-KΩ resistor.
HSS_RXCLK1 I/O Yes
Receive clock.
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-KΩ resistor.
Notes:
1. Features disabled/enabled by Soft Fuse must be done during the boot-up sequence. A feature cannot be enabled after
being disabled without asserting a system reset.
2. Features disabled by a specific part number, do not require pull-ups or pull-downs. Therefore, all pins can be left
unconnected.
3. Features enabled by a specific part number — and required to be Soft Fuse-disabled, as stated in Note 1 — only require
pull-ups or pull-downs in the clock-input signals.