Intel 41110 manual PCI 66 MHz Embedded Topology, PCI 66 MHz Embedded Table

PCI-X Layout Guidelines

8.6.4PCI 66 MHz Embedded Topology

Figure 20 and Table 13 provide routing details for a topology with an embedded PCI 66 MHz design.

Figure 20. PCI 66 MHz Embedded Topology

EM1	EM3
TL EM1	TL EM3
TL1	TL2
TL EM2	TL EM4
EM2	EM4

B2722 -01

Table 13.	PCI 66 MHz Embedded Table
	Parameter	Routing Guideline for Lower AD Bus
	Reference Plane	Route over an unbroken ground plane
	Board Impedance	60 Ω +/- 15%
	Microstrip Trace Spacing	18 mils center to center
	Stripline Trace Spacing	12 mils center to center
	Group Spacing	Spacing from other groups: 25 mils min, edge to edge
	Breakout	5 mils on 5 mils spacing. Maximum length of breakout
		region can be 500 mils.
	Trace Length 1 TL1: From 41110 signal Ball to first	5.0” max
	junction
	Trace Length TL2 between junctions	0.5” min - 3.5” max
	Trace Length TL_EM1 to TL_EM4 from junction to	2.0” min - 3.0” max
	embedded devices
	Length Matching Requirements	Clocks coming from the clock driver must be length
		matched to within 25 mils.
	Number of vias	4 vias max.

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Intel® 41110 Serial to Parallel PCI Bridge Design Guide 39