Intel 31154 manual Customer Reference Board Stackup, Signal

Customer Reference Board

The IQ31154 CRB is implemented on eight layers. These layers are detailed in Table 22. This example is provided as a reference; each individual 31154 application may vary.

Table 22.	Customer Reference Board Stackup
	Layers	Signal
	Top layer	Signal layer—critical nets (clocks, S/P AD buses)
	2nd layer	Ground plane
	3rd layer	Signal layer
	4th layer	Power plane—(split voltage plane 3.3 and 1.3 for I/O and core)
	5th layer	Power plane—(also a split voltage plane 5 and 12 V)
	6th layer	Signal—(some minor 25 mil wide power runs included)
	7th layer	Ground plane
	8th layer	Signal layer (critical nets)

FR-4, 0.062 in. ± 0.008, 1.0 oz. copper power/GND; ½ oz. copper signal.

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60 Intel® 31154 133 MHz PCI Bridge Design Guide Design Guide