Tài liệu the PCI Bus demystified phần 9

Figure 9-10 shows a solution to that problem utilizing pallet
bridge boards. The host processor resides in the system slot of
Segment B and bridges directly to Segments A and C. Note that
Segment A must have its system slot on the right and that two
different bridge boards are required — one that bridges from right
to left and another that bridges from left to right. In practice, the
same PC board can be used for both forms with different mounting
locations for the connectors.