January 2007 165
Intel
®
855GME Chipset and Intel
®
6300ESB ICH Embedded Platform Design Guide
Integrated Graphics Display Port
6.3.2.3 DVOB and DVOC Routing Guidelines
Table 51 provides the DVOB and DVOC routing guideline summary.
The routing guideline recommendations in this section apply for both interfaces. Refer to Table 52
for GMCH DVOB package lengths and Table 53 for GMCH DVOC package lengths.
• 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 51. DVOB and DVOC Routing Guideline Summary
Parameter Definition
Signal Group DVOBD [11:0], DVCBD [11:0]
Motherboard Topology Point to point
Reference Plane Ground Referenced
Characteristic Trace Impedance (Zo) 55
Ω ±15%
Nominal Trace Width Inner layers: 4 mils
Minimum Spacing to Trace Width Ratio 2:1 (e.g., 8 mil space to 4 mil trace)
Minimum Isolation Spacing to non-DVO Signals 20 mils
Minimum Spacing to Other DVO Signals 12 mils (See exceptions for breakout region below.)
Minimum Spacing of DVOBCLK [1:0] or
DVOCCLK[1:0] to any other signals
12 mils
Package Length Range – P1 Refer to Table 5 2 and Table 53 for package lengths.
Total Length – Max 6”
Data to Clock Strobe Length Matching
Requirements
+ 100 mils (Refer to Ta ble 50 for length matching
requirements.)
CLK0 to CLK1 Length Matching Requirements
+ 10 mils (Refer to Table 50 for length matching
requirements.)
Table 52. DVOB Interface Package Lengths (Sheet 1 of 2)
Signal Pin Number Package Length (mils)
DVOBBLANK# L2 583
DVOBCCLKINT M3 520
DVOBCINTR# G2 712
DVOBCLK P3 475
DVOBCLK# P4 439
DVOBD[0] R3 489
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