Intel IXP43X manual Signal Interface, PCI Controller Sheet 1 of

Intel® IXP43X Product Line of Network Processors—Hardware Design Guidelines

3.11.1Signal Interface

Table 17.	PCI Controller (Sheet 1 of 2)
Name		Type	Pull
			Up/	Recommendations
		Field
			Down
				PCI Address/Data bus.
PCI_AD[31:0]		I/O	Yes	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-KΩresistor.
				PCI Command/Byte Enables.
PCI_CBE_N[3:0]		I/O	Yes	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-KΩresistor.
				PCI Parity.
PCI_PAR		I/O	Yes	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-KΩresistor.
				PCI Cycle Frame.
PCI_FRAME_N		I/O	Yes	When this interface/signal is enabled and is being used or not being used in a system design,
				the interface/signal should be pulled high with a 10-KΩresistor.
				PCI Target Ready.
PCI_TRDY_N		I/O	Yes	When this interface/signal is enabled and is being used or not being used in a system design,
				the interface/signal should be pulled high with a 10-KΩresistor.
				Initiator Ready.
PCI_IRDY_N		I/O	Yes	When this interface/signal is enabled and is being used or not being used in a system design,
				the interface/signal should be pulled high with a 10-KΩresistor.
				Stop.
PCI_STOP_N		I/O	Yes	When this interface/signal is enabled and is being used or not being used in a system design,
				the interface/signal should be pulled high with a 10-KΩresistor.
				Parity Error.
PCI_PERR_N		I/O	Yes	When this interface/signal is enabled and is being used or not being used in a system design,
				the interface/signal should be pulled high with a 10-KΩresistor.
				System Error.
PCI_SERR_N		I/O	Yes	When this interface/signal is enabled and is being used or not being used in a system design,
				the interface/signal should be pulled high with a 10-KΩresistor.
				Device Select:
PCI_DEVSEL_N		I/O	Yes	When this interface/signal is enabled and is being used or not being used in a system design,
				the interface/signal should be pulled high with a 10-KΩresistor.
				Initialization Device Select.
PCI_IDSEL		I	Yes	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-KΩresistor.
				Arbitration Request.
PCI_REQ_N[3:1]		I	Yes	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-KΩresistor.
				Arbitration Request:
PCI_REQ_N[0]		I/O	Yes	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-KΩresistor.
PCI_GNT_N[3:1]		O	No	Arbitration Grant.
				Arbitration Grant.
PCI_GNT_N[0]		I/O	Yes	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-KΩresistor.

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.

Intel® IXP43X Product Line of Network Processors
HDG	April 2007
46	Document Number: 316844; Revision: 001US