Design Guide

Intel Pentium M/Celeron M Front Side Bus Design Guidelines
R
62 Intel
®
855GM/855GME Chipset Platform Design Guide
compensation resistors on the secondary side. The use of 18-mil wide dog bones and traces is used to
achieve the Zo = 27.4-Ω target to ensure proper operation of the PSB. See Figure 27 for more details.
Figure 25. Processor COMP[3:0] Resistor Layout
VCCP
VCCP
COMP[2]
COMP[3]
A
A1
Y2
GND
pins
VCCA=1.8
SECONDARY SIDE
VCCPVCCP
VCCP
One
GND Via
COMP[0]
COMP[1]
COMP[2]COMP[2]
COMP[3]COMP[3]
PRIMARY SIDE
VCCA
Figure 26. Processor COMP[1:0] Resistor Alternative Primary Side Layout
PRIMARY SIDE
COMP[1]
COMP[0]
VCCP
VCCA=1.8v
GND
PRIMARY SIDE
COMP[1]
COMP[0]
VCCP
VCCA
GND
Via