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cPCI-MXS64GX Technical Reference Manual
The PCI-to-PCI bridge allows the Primary and Secondary PCI buses to operate
concurrently. This means that a master and a target on the same PCI bus can communicate
while the other PCI bus is busy. This traffic isolation may increase system performance in
applications where system resources are highly used.
3.2.5. 82371AB PCI-to-ISA Bridge / IDE Xcelerator (PIIX4)
The PCI-to-ISA bridge is configured to support signals to directly drive IDE interfaces,
USB ports, extra communication ports (Serial Ports 3 and 4), and standard Serial Ports (1
and 2), floppy disk drives, mouse and keyboard through a super I/O controller
(FDC37C672).
3.10
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