This 4.5.1 seems form "PCI-to-PCI Bridge Architecture Specification", the full document can be download from below link: https://cds.cern.ch/record/551427/files/cer-2308933.pdf
This 4.5.1 seems form "PCI-to-PCI Bridge Architecture Specification", the full document can be download from below link: https:/ /cds.cern. ch/record/ 551427/ files/cer- 2308933. pdf