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®
Intel
855GME Chipset and Intel
When choosing cables, it is important to remember:
•
Use controlled impedance media. The differential impedance of cable LVDS uses shall be
100 Ω . Cables shall 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 47. LVDS Package Lengths
Signal Group
CHANNEL
A
6.3
Digital Video Out Port
The GMCH DVO port interface supports a wide variety of third party DVO-compliant devices
(e.g., TV encoder, TMDS transmitter or integrated TV encoder and TMDS transmitter). The
82855GME has two dedicated Digital Video Out Ports (DVOB and DVOC). Intel's DVO port is a
1.5 V only interface that may support transactions up to 165 MHz. Some of the DVO port
command signals may require voltage translation circuit depending on the third party device.
®
6300ESB ICH Embedded Platform Design Guide
Package
GMCH Signal
Trace Length
Name
(mils)
ICLKAP
503.7
ICLKAM
498.8
IYAP0
399.6
IYAM0
385.4
IYAP1
487.5
IYAM1
466.2
IYAP2
572.6
IYAM2
566.2
IYAP3
643.2
IYAM3
637.8
January 2007
Integrated Graphics Display Port
GMCH Signal
Signal Group
Name
ICLKAP
ICLKAM
IYBP0
IYBM0
IYBP1
CHANNEL
B
IYBM1
IYBP2
IYBM2
IYBP3
IYBM3
Package
Trace Length
(mils)
502.0
499.1
359.8
353.7
524.7
516.6
623.3
604.2
441.8
441.7
161
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