Intel 855GME

January 2007 285
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
Schematic Checklist Summary
12.4.2 PCI Interface Checklist
PXPCLKO4
No extra pull-ups needed
Ensure this is connected to
PXPCLKI through a 33
Ω resistor
No extra pull-ups needed
Ensure this is connected
to PXPCLKI through a 33
Ω resistor
This signal is actively
driven by the
6300ESB
PXPCLKO[0:3]
No extra pull-ups needed
Ensure this is connected to the PCI-
X/PCI Device through a 33
Ω
resistor
May leave as no connect
These signals are
actively driven by the
6300ESB
PXPCIRST#
No extra pull-up needed
Connected to the MCH, External
Controllers (LAN etc.), FWH, SIO
Controllers and Glue Chip
respective reset signals.
No extra pull-up needed
Connected to the MCH,
External Controllers (LAN
etc.), FWH, SIO
Controllers and Glue Chip
respective reset signals.
These signals are
actively driven by the
6300ESB
PXIRQ[0:3]#/
GPIO[33:36]
8.2 K
Ω pull-up resistors to VCC3.3 May leave as no connect
PXPLOCK# 8.2 K
Ω pull-up resistors to VCC3.3
8.2 K
Ω pull-up resistors to
VCC3.3
See PCI-X
specification rev 1.0a
PCIXSBRST#
When utilizing this pin ensure the
circuit shown in Section 9.10.3 is
implemented
Connected to all devices that reside
on the PCI-X bus.
May leave as no connect
The external circuit
ensures proper
functionality
IDSEL
(On PCI-X
Connector)
A 100
Ω series resistor on IDSEL
should be connected to the PCI-X
AD bus.
N/A
Improves signal
quality when
connected
3.3 Vaux
(On PCI-X
Connector)
Leave this unconnected on the PCI-
X slots.
N/A
6300ESB does not
support PCI-X bus
power management.
Table 133. PCI Interface Checklist (Sheet 1 of 3)
Checklist Items Recommendations Interface not used Reason/Impact
DEVSEL#,
FRAME#, IRDY#
Recommend an 8.2 K
Ω pull-up
resistor to V
CC
3.3 or a 2.7 Ω K pull-
up resistor to V
CC
5.
Recommend an 8.2 K
Ω
pull-up resistor to V
CC
3.3
or a 2.7
Ω K pull-up
resistor to V
CC
5.
See
PCI 2.2
Component
Specification
pull-up
recommendations for
V
CC
3.3 and V
CC
5.
PAR No extra pull-up needed
Recommend an 8.2 K
Ω
pull-up resistor to V
CC
3.3
PCICLK
Ensure this pin is connected to a
33MHz clock output of the clock
generator (CK409) through a 33
Ω
resistor
Recommend an 8.2 K
Ω
pull-up resistor to V
CC
3.3
This signal is not 5 V
tolerant
Table 132. PCI-X Interface Checklist
Checklist Items Recommendations Interface not used Reason/Impact