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Intel
®
31154 133 MHz PCI Bridge Design Guide Design Guide 13
Package Information
Package Information 3
The Intel
®
31154 133 MHz PCI Bridge is offered in a 421-lead PBGA package. The mechanical
dimensions for this package are provided in Figure 2 on page 14.
Figure 3 on page 15 and Figure 4 on page 16 show the 421-lead PBGA, mapped by pin function.
These figures are helpful in placing components around the 31154 for the layout of a PCB. To
simplify routing and minimize the number of cross traces, keep this layout in mind when placing
components on your board. The signals, by design, are located on the PBGA package to simplify
signal routing and system implementation. Figure 3 shows the left side of the 31154 ball map, and
Figure 4 shows the right side of the ball map.