January 2007 161
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
Integrated Graphics Display Port
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.
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.
Table 47. LVDS Package Lengths
Signal Group
GMCH Signal
Name
Package
Trace Length
(mils)
Signal Group
GMCH Signal
Name
Package
Trace Length
(mils)
CHANNEL
A
ICLKAP 503.7
CHANNEL
B
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
IYAM3 637.8 IYBM3 441.7
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