Intel 41110 manual PCI/PCI-X Interface Signals Sheet 2, Miscellaneous Signals

			Design Guide Checklist
Table 20. PCI/PCI-X Interface Signals (Sheet 2 of 2)
	Signals	Recommendations	Reason/Impact
		Controls frequency of the PCI segment when running
		in conventional PCI mode (33 MHz or 66 MHz):
	A_M66EN	0 = 33 MHz PCI
		1 = 66 MHz PCI	Sampled on the rising edge of
		• Pull-up using a 8.2KΩ resistor when the PCI bus is	PERST#.
		to operate at 66 MHz and not already pulled up by
		system board. This signal is grounded for 33 MHz
		operation.
			• Design without secondary PCI/PCI-
			X Slot
			— If there is at least one legacy
			PCI device on the PCI/PCI-X
			bus, tie this pin directly to
			GND.
			— If all devices are PCI-X
			capable and there is at least
			one PCI-X device that only
	A_PCIXCAP	Connects directly to the PCIXCAP pin on the PCI slot.	supports maximum PCI-X
			66MHz on the secondary PCI
		Ω	bus, pull down to GND
		Connect to VCC33 through an 8.2K pullup resistor.	through 10KΩ series resistor
			parallel with a 0.01uF
			capacitor.
			— If all secondary PCI-X
			devices (and the bus loading)
			support PCI-X 133MHz,
			connect PCIXCAP to 3.3V
			through an 8.2K Ω resistor
		The series resistor on IDSEL should be 200Ω ±5% if it
	IDSEL	is exclusively PCIX mode. If it is PCI mode or mixed
		PCI/ PCIX mode is intended, 510 ohms is
		recommended.

Table 21. Miscellaneous Signals

Signals	Recommendations	Reason/Impact
RSTIN#	Used for debug purposes. Connect to VCC33 through
	an 8.2KΩ pullup resistor for normal operation.
A_STRAP0,
A_STRAP1,	These signals REQUIRE external pull-downs to GND
A_STRAP2,
	on the board 8.2KΩ unless otherwise stated.
A_STRAP6,
RESERVED [8:1]

Intel® 41110 Serial to Parallel PCI Bridge Design Guide 57