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20 Intel
®
31154 133 MHz PCI Bridge Design Guide Design Guide
Terminations
P_GNT# Connect to GNT# of the primary PCI bus.
P_IDSEL#
Connect to one of the AD lines of the primary PCI
bus or to the IDSEL# signal of the PCI edge
connector (for add-in card applications).
Refer to Section 5.3, “IDSEL Lines” on page 30 for
more details.
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#,
S_STOP#,
S_DEVSEL#,
S_PERR#,
S_SERR#
Pull up to VCC33 voltage through external 8.2 KΩ
resistors.
S_REQ[8:1]#,
S_REQ0#/BR_GNT#,
S_GNT0#/BR_REQ#
Pull up to VCC33 voltage through external 8.2 KΩ
resistors.
Pull-up for both internal and external arbiter mode.
Secondary GNT#
S_GNT1#,
S_GNT2#,
S_GNT3#,
S_GNT4#,
S_GNT5#,
S_GNT6#,
S_GNT7#,
S_GNT8#
Connect to GNT# input of the PCI devices on the
secondary PCI bus.
NC when not used.
Table 5. Pull-Up/Pull-Down Terminations (Sheet 2 of 9)
Signal Pull-Up/Pull-Down or Termination (See Note 1) Comments
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 R
MIN
=2.42KΩ, R
TYP
=8.2KΩ, 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
.