Intel 31154 manual Pull-Up/Pull-Down Terminations Sheet 2, Secondary PCI Signals

Terminations
Table 5.	Pull-Up/Pull-Down Terminations (Sheet 2 of 9)
Signal		Pull-Up/Pull-Down or Termination (See Note 1)	Comments
P_GNT#		Connect to GNT# of the primary PCI bus.
		Connect to one of the AD lines of the primary PCI	Refer to Section 5.3, “IDSEL Lines” on page 30 for
P_IDSEL#		bus or to the IDSEL# signal of the PCI edge
			more details.
		connector (for add-in card applications).
P_M66EN		Connect to the M66EN signal of the primary PCI
		bus of the PCI add-in card finger.
P_PAR		Connect to PAR of the primary PCI bus.
P_PAR64		Connect to PERR# of the primary PCI bus.
P_PERR#		Connect to PERR# of the primary PCI bus.
P_REQ#		Connect to one of the PCI bus request signals of
		the primary PCI bus.
P_SERR#		Connect to SERR# of the primary PCI bus.
Secondary PCI Signals
S_AD[63:32]		Pull up to VCC33 through external 8.2 KΩ
		resistors.
S_CBE[7:4]#		Pull up to VCC33 through external 8.2 KΩ
		resistors.
S_REQ64#		Pull up to VCC33 through external 8.2 KΩ
		resistors.
S_ACK64#		Pull up to VCC33 through external 8.2 KΩ
		resistors.
S_FRAME#,
S_IRDY#,
S_TRDY#,		Pull up to VCC33 voltage through external 8.2 KΩ
S_STOP#,
		resistors.
S_DEVSEL#,
S_PERR#,
S_SERR#
S_REQ[8:1]#,		Pull up to VCC33 voltage through external 8.2 KΩ
S_REQ0#/BR_GNT#,			Pull-up for both internal and external arbiter mode.
		resistors.
S_GNT0#/BR_REQ#
Secondary GNT#
S_GNT1#,
S_GNT2#,		Connect to GNT# input of the PCI devices on the
S_GNT3#,
		secondary PCI bus.
S_GNT4#,
S_GNT5#,		NC when not used.
S_GNT6#,
S_GNT7#,
S_GNT8#

NOTES:

1.The recommended value for pull-up resistors for PCI applications is 5.6 KΩ (note that the minimum value for PCI 3.3 V signaling RMIN = 2.42 KΩ, RTYP = 8.2 KΩ, as per the PCI Local Bus Specification, Revision 2.3, section 4.3.3).

2.The recommended value for pull-up resistors for PCI-X applications is 8.2 KΩ. For PCI-X, the minimum pull-up resistor value is 5 KΩ, as per the PCI-X Addendum to the PCI Local Bus Specification, Revision 1.0b, section 9.7.

3.For plug-in card implementations, the pull-up must be on the motherboard.

4.Connect PVIO and SVIO pull-up resistors to 5 V or 3.3 V power supply through an external resistor—25 Ω (5 V) or

0 Ω (3.3 V), depending on the signaling level of the primary/secondary PCI bus. Refer to the power-sequencing guidelines in Section 8.2 on page 58.

20 Intel® 31154 133 MHz PCI Bridge Design Guide Design Guide