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48 Intel
®
31154 133 MHz PCI Bridge Design Guide Design Guide
PCI-X Layout Guidelines
7.2.2.1 Embedded Intel
®
31154 133 MHz PCI Bridge Application at 100 MHz
Figure 12 shows the PCI-X layout for a embedded 133 MHz design. In this application the 31154
is driving three loads. Table 17 shows the corresponding wiring lengths to use as a reference.
Figure 12. Embedded Intel
®
31154 133 MHz PCI Bridge Design 100 MHz PCI-X Layout
Table 17. Wiring Lengths for Embedded 100 MHz Design
Segment
Lower AD Bus Upper AD Bus
Units
Minimum Length Maximum Length Minimum Length Maximum Length
W1 3.5 6 3.5 6.0 inches
W2 2.5 5.0 1.5 4.0 inches
W3 0.75 1.5 1.75 2.75 inches
W4 0.1 0.1 – – inches
W5 1.725 1.725 – – inches
W6 3.25 6.5 3.25 6.75 inches
W7 3.25 6.5 3.25 6.75 inches
B3062-02
I/O Buffer
PCI
Agent 1
PCI Agent 2
PCI Agent 3
W4
IDSEL
W5
W3W1 W2
W6
W7