Cpu Signals Checklist - Intel 855GME Design Manual

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®
Intel
855GME Chipset and Intel
Table 138.
Power Management Checklist (Sheet 2 of 2)
Checklist Items
SYS_RESET#
THRM#
THRMTRIP#
VRMPWRGD
12.4.8

CPU Signals Checklist

Note: Ensure processor recommendations for the following signals are taken into consideration as well as
the following recommendations.
Table 139.

CPU Signals Checklist

Checklist Items
A20GATE
A20M#, CPUSLP#
FERR#
IGNNE#
INIT#
INTR, NMI
RCIN#
SERIRQ
SMI#, STPCLK#
®
6300ESB ICH Embedded Platform Design Guide
Recommendations
Recommend an 8.2 K Ω pull-up resistor
to V
3.3. Also recommend a
CCSus
100 Ω to 1 K Ω pull-down resistor
isolated from SYS_RESET# by means
of a normally open switch.
Connect to temperature sensor. Pull-up
when not used (an 8.2 K Ω pull-up
resistor to V
3.3).
CC
A pull-up resistor to the V_CPU_IO well
(62 Ω) . See Processor Design Guide to
insure proper pull-up value.
A 8.2 K Ω pull-up to Vcc3.3
Recommendations
Pull-up signal to V
3.3 through a
CC
10 K Ω resistor.
or
If software control of A20M# is desired,
connect to a GPIO that is driven high at
the rising edge of reset
No external resistors required
Requires a external pull-up resistor to
V_CPU_IO.(62 Ω)
No external resistors required
See
Section 9.13.4
for more infor-
mation.
No external resistors required
Pull-up signals to V
3.3 through a
CC
10 K Ω resistor.
External 8.2 K Ω pull-up resistor to
V
3.3 is recommended.
CC
No external resistors required
January 2007
Schematic Checklist Summary
Reason/Impact
Input to 6300ESB cannot float. This pin
forces an internal reset to the 6300ESB
after the signal is internally debounced.
Input to 6300ESB cannot float. THRM#
polarity bit defaults THRM# to active low,
so pull up.
Input to the 6300ESB cannot float.
Reason/Impact
Typically driven by an open drain external
micro-controller.
If this signal is not used pull-up to V
through a 10 K Ω resistor.
Push/pull buffers now drive the output
signals.
Push/pull buffers now drive the output
signals.
Push/pull buffers now drive the output
signals.
Typically driven by an open drain external
micro-controller.
Push/pull buffers now drive the output
signals.
3.3
CC
291

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