PATH
For PCI-to-PCI bridges, the standard PCI configuration header (the first 64 bytes of PCI configuration space) is different from that of standard PCI devices. Figure 4-2 gives a map of the registers in the portion of a PCI-to-PCI bridge's configuration space defined by the PCI specification. In Figure 4-2, read-only registers are shaded; all other registers are read/write.
Figure 4-2 PCI-to-PCI bridge register map
