Design Guide

Integrated Graphics Display Port
R
Intel
®
855GM/855GME Chipset Platform Design Guide 167
• Use controlled impedance media. The differential impedance of cable LVDS uses should be 100 Ω
± 15%. Cables should not introduce major impedance discontinuities that cause signal reflection.
• Balanced cables (twisted pair) are usually better than unbalanced cables (ribbon cable, multi-
conductor) for noise reduction and signal quality.
• Cable length must be less than 16 inches.
Table 60. LVDS Package Lengths
Signal Group
GMCH Signal
Name
Package Trace
Length (mils)
Signal Group
GMCH Signal
Name
Package Trace
Length (mils)
ICLKAP 503.7 ICLKAP 502.0
ICLKAM 498.8 ICLKAM 499.1
IYAP0 399.6 IYBP0 359.8
IYAM0 385.4 IYBM0 353.7
IYAP1 487.5 IYBP1 524.7
IYAM1 466.2 IYBM1 516.6
IYAP2 572.6 IYBP2 623.3
IYAM2 566.2 IYBM2 604.2
IYAP3 643.2 IYBP3 441.8
CHANNEL
A
IYAM3 637.8
CHANNEL
B
IYBM3 441.7