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[pci] HOST bridge with all 6 PCI images

hi :
   I am reading the pci_design_document.Now a simple question 
confused me.It is said that If PCI bridge is implemented as HOST bridge 
with all 6 PCI images (PCI_IMAGE6) , then there is no Read-Only port 
connection between Configuration space and PCI Target Unit.Dose it  
mean in that way the pci target can not read the configuration spae?
Why this way?Can anybody explain it .Thanks a lot in adavance! 
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