Guide

Platform Design Checklist
R
254 Intel
®
852GM Chipset Platform Design Guide
14.7.4.3. DAC
Pin Name System Pull-up /Pull-down In Series Notes
9
REFSET
127
Ω 1% pull-down to gnd
RED # Connect to gnd Need to connect to RED’s return path
BLUE # Connect to gnd Need to connect to BLUE’s return path
GREEN# Connect to gnd Need to connect to GREEN’s return path
RED On GMCH side of ferrite bead:
75
Ω 1% pull-down to gnd, 3.3 pF
cap to gnd, ESD diode protection
for Vcc1_5
On VGA side of ferrite bead:
3.3 pF cap to gnd
Ferrite bead:
75
Ω at
100 MHz
Ferrite bead for EMI suppression between
GMCH and VGA connector.
BLUE On GMCH side of ferrite bead:
75
Ω 1% pull-down to gnd, 3.3 pF
cap to gnd, ESD diode protection
for Vcc1_5
On VGA side of ferrite bead:
3.3 pF cap to gnd
Ferrite bead:
75
Ω at
100 MHz
Ferrite bead for EMI suppression between
GMCH and VGA connector.
GREEN On GMCH side of ferrite bead:
75
Ω 1% pull-down to gnd, 3.3 pF
cap to gnd, ESD diode protection
for Vcc1_5
On VGA side of ferrite bead:
3.3 pF cap to gnd
Ferrite bead:
75
Ω at
100 MHz
Ferrite bead for EMI suppression between
GMCH and VGA connector.
HSYNC On VGA side of seires resistor:
33 pF cap to gnd
39
Ω
Use unidirectional buffer to prevent potential
electrical overstress and illegal operation of
the GMCH.
VSYNC On VGA side of series resistor:
33 pF cap to gnd
39
Ω
Use to unidirectional buffer to prevent potential
electrical overstress and illegal operation of
the GMCH.
14.7.5. Miscellaneous
Pin Name System
Pull-up/Pull-down
Notes
9
EXTTS
10 k
Ω 1% pull-up to Vcc3_3
DPWR# (pin
AA22)
Connect to DPWR# pin of Intel Celeron M processor.
Leave as NC for all other processors.
LCLKCTLB
1 k
Ω pull-up to Vcc3_3 for Intel 852GM
GMCH.
Strap option for Mobile Intel
®
Pentium
®
4 Processor-
M
LCLKCTLA Leave as NC if not used.
GST1, GST0
Leave as NC or 1 k
Ω pull-up to Vcc1_5
These pins have internal pull-down. See Table 99
below for configuration options.