Pci universal bridge for Dreamcast or G2bus <-> pci

 Hello.
  Recently I am dealt with a problem of construction PCI of the bridge for DC. 
  Similar  BBA. 
  Having seen a code from dreamcast/dev/g2 and written test fragments for the analysis of conditions of  bus G2.
  I managed to develop the electronic scheme of the device.
  It consists from:
                      interface G2 
                      interface PCI 
                     SRAM Bufer for PCI DMA 
                     operating logic
 At present I am engaged in its debugging. 
 At the first stage the main thing is debugging of a part responsible for access to configuration space PCI and io ports.
 For me there is opened a question with realization of interruptions.