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Intel
®
IXP45X and Intel
®
IXP46X Product Line of Network Processors
February 2007 HDD
Document Number: 305261; Revision: 004 31
General Hardware Design Considerations—Intel
®
IXP45X and Intel
®
IXP46X Product Line of
Network Processors
3.5.1 Signal Interface MII
Table 8. MII NPE A Signal Recommendations
Name
Input/
Output
Pull
Up
Down
Recommendations
ETHA_TXCLK I 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.
ETHA_TXDATA[3:0] O No Transmit Data.
ETHA_TXEN O No Transmit Enable.
ETHA_RXCLK I 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.
ETHA_RXDATA[3:0] I Yes
Receive Data.
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.
ETHA_RXDV I Yes
Receive Data Valid.
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.
ETHA_COL I Yes
Collision Detect.
If operating in a full duplex mode and there is no requirement to use the Collision
Detect signal, then the pin must be pulled low with a 10-KΩ resistor.
ETHA_CRS I Yes
Carrier Sense.
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.
Table 9. MII NPE B Signal Recommendations (Sheet 1 of 2)
Name
Input/
Output
Pull
Up/
Down
Recommendations
ETHB_TXCLK I 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.
ETHB_TXDATA[3:0] O No Transmit Data.
ETHB_TXEN O No Transmit Enable.
ETHB_RXCLK I 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.
ETHB_RXDATA[3:0] I Yes
Receive Data.
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.
ETHB_RXDV I Yes
Receive Data Valid.
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.