Guide

Hub Interface
R
152 Intel
®
852GM Chipset Platform Design Guide
Table 64. Recommended Resistor Values for HLVREF and PSWING Divider Circuits for GMCH
Signal
Name
Recommended Resistor Values VCCHI Capacitor
HLVREF
(350 mV)
R4 = 243 Ω ± 1%
R5 = 100
Ω ± 1%
VCCHI=1.2 V C3 = 0.1 µF (near divider)
C6 = 0.01 µF (near component)
PSWING
(800 mV)
R6 = 49.9 Ω ± 1%
R7 = 100
Ω ± 1%
VCCHI=1.2 V C1 = 0.1 µF (near divider)
C5 = 0.01 µF (near component)
9.4. Hub Interface Decoupling Guidelines
To improve I/O power delivery, use two 0.1-µF capacitors per each component (i.e. the ICH4-M and
GMCH). These capacitors should be placed within 50 mils from each package, adjacent to the rows that
contain the Hub Interface. If the layout allows, wide metal fingers running on the V
SS
side of the board
should connect the V
CC
HI side of the capacitors to the V
CC
HI power pins. Similarly, if layout allows,
metal fingers running on the V
CC
HI side of the board should connect the groundside of the capacitors to
the V
SS
power pins.