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Intel
®
31154 133 MHz PCI Bridge Design Guide Design Guide 51
PCI-X Layout Guidelines
7.2.3.1 Embedded Intel
®
31154 133 MHz PCI Bridge Application at 66 MHz
Figure 14 shows an 31154 in a stand-alone embedded application. In this application the 31154 is
shown driving four loads. Additional loads might be possible with careful simulation. Table 19
shows the corresponding wiring lengths to use as a reference.
Figure 14. Embedded Intel
®
31154 133 MHz PCI Bridge Wiring for 66 MHz
Table 19. Wiring Lengths for Embedded 66 MHz Design
Segment
Lower AD Bus Upper AD Bus
Units
Minimum Length Maximum Length Minimum Length Maximum Length
W15757inches
W2 0.75 1.5 1.75 2.75 inches
W3 0.1 0.1 – – inches
W4 1.725 1.725 – – inches
W51111inches
W6 0.75 1.5 1.75 2.75 inches
W71111inches
W8 0.75 1.5 1.75 2.75 inches
W91111inches
W10 0.75 1.5 1.75 2.75 inches
B3247-01
W1
I/O Buffer
PCI Agent 2
PCI Agent 1
PCI Agent 3
W3
IDSEL
W4
W2
W5
W7
PCI Agent 4
W9
W6
W8
W10