Intel Pentium M Processor / Intel Celeron M Processor; Resistor Recommendations - Intel 855GM Design Manual

Platform Design Checklist
16.4.

Intel Pentium M Processor / Intel Celeron M Processor

16.4.1.

Resistor Recommendations

Pin Name System
Pull-up/Pull-down
A20M#
BR0#
COMP0, 27.4 Ω ± 1% pull-
COMP2
down to gnd
COMP1, 54.9 Ω ± 1% pull-
COMP3
down to gnd
DPSLP#
FERR# 56 Ω pull-up to VCCP
GTLREF 1 K Ω ± 1% pull-up to
VCCP
2 K Ω ± 1% pull-down
to gnd
IERR# 56 Ω pull-up to VCCP
INIT#
IGNNE#
LINT0/INTR
LINT1/NMI
PROCHOT# 56 Ω pull up to VCCP
PSI#
PWRGOOD 330 Ω pull-up to
VCCP
284
Series Voltage
Termination Translation
56 Ω from pull-
up to ICH4-M
pin.
R1 = 1.3 K Ω
R2 = 330 Ω
Rs = 330 Ω
R1 = 1.3 K Ω
R2 = 330 Ω
Rs = 330 Ω
®
Intel
Notes
Point-to-point connection to ICH4-M.
Point-to-point connection to GMCH.
Resistor placed within 0.5" of processor
pin. Trace should be 27.4 Ω ± 15%.
Resistor placed within 0.5" of processor
pin. Trace should be 55 Ω ± 15%.
Connect to GMCH and ICH4-M.
Point-to-point connection to ICH4-M,
with pull-up resistor and series resistor
placed by ICH4-M.
Voltage divider should be placed within
0.5" of processor pin.
IERR# is a 1.05 V signal. Voltage
translation logic and/or series resistor
may be required if used.
Point-to-point connection to ICH4-M.
Voltage transition circuit is required if
connecting to FWH. Signal is T-split from
the ICH4-M to FWH.
See Figure 149.
Point-to-point connection to ICH4-M.
Point-to-point connection to ICH4-M.
Point-to-point connection to ICH4-M.
PROCHOT# is a VCCP signal. This
signal is not used on the CRB. So,
voltage translation logic may be required
if used.
If Voltage Translation is Required:
Driver isolation resistor should be placed
at the beginning of the T-split to the
system receiver.
See Figure 150.
Can be left as NC, if not used for IMVP.
Point-to-point connection to ICH4-M, with
resistor placed by the processor.
855GM/855GME Chipset Platform Design Guide
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