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®
Intel
855GME Chipset and Intel
6.3.2.3
DVOB and DVOC Routing Guidelines
Table 51
Table 51. DVOB and DVOC Routing Guideline Summary
Signal Group
Motherboard Topology
Reference Plane
Characteristic Trace Impedance (Zo)
Nominal Trace Width
Minimum Spacing to Trace Width Ratio
Minimum Isolation Spacing to non-DVO Signals
Minimum Spacing to Other DVO Signals
Minimum Spacing of DVOBCLK [1:0] or
DVOCCLK[1:0] to any other signals
Package Length Range – P1
Total Length –
Data to Clock Strobe Length Matching
Requirements
CLK0 to CLK1 Length Matching Requirements
The routing guideline recommendations in this section apply for both interfaces. Refer to
for GMCH DVOB package lengths and
•
All signals shall be routed as striplines (inner layers).
•
All signals in a signal group shall be routed on the same layer. Routing studies have shown that
these guidelines may be met. The trace length and trace spacing requirements must not be
violated by any signal.
•
Route the DVOBCLK[1:0] or DVOCCLK[1:0] signal pairs 4 mils wide and 8 mils apart with
a max trace length of 6 inches. This signal pair shall be a minimum of 12 mils from any
adjacent signals.
•
To break out of the 82855GME, the DVOB and/or DVOC data signals may be routed with a
trace width of 4 mils and a trace spacing of 7 mils. The signals shall be separated to a trace
width of 4 mils and a trace spacing of 8 mils within 0.3 inches of the GMCH component.
Table 52. DVOB Interface Package Lengths (Sheet 1 of 2)
Signal
DVOBBLANK#
DVOBCCLKINT
DVOBCINTR#
DVOBCLK
DVOBCLK#
DVOBD[0]
provides the DVOB and DVOC routing guideline summary.
Parameter
Pin Number
L2
M3
G2
P3
P4
R3
January 2007
®
6300ESB ICH Embedded Platform Design Guide
Integrated Graphics Display Port
DVOBD [11:0], DVCBD [11:0]
Point to point
Ground Referenced
55 Ω ± 15%
Inner layers: 4 mils
2:1 (e.g., 8 mil space to 4 mil trace)
20 mils
12 mils (See exceptions for breakout region below.)
12 mils
Refer to
Table 52
and
Max 6"
+ 100 mils (Refer to
requirements.)
+ 10 mils (Refer to
Table 50
requirements.)
Table 53
for GMCH DVOC package lengths.
Package Length (mils)
583
520
712
475
439
489
Definition
Table 53
for package lengths.
Table 50
for length matching
for length matching
Table 52
165
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