XIO2001 PCIe to PCI Bus Translation Bridge Texas Instruments XIO2001 PCI Express (PCIe) to PCI Bus Translation Bridge is fully compliant to the PCI Express to PCI/PCI-X Bridge Specification, Revision 1.0. For downstream traffic, the bridge simultaneously supports up to eight posted and four non-posted transactions. For upstream traffic, up to six posted and four non-posted transactions are simultaneously supported. The PCI Express interface is fully compliant to the PCI Express Base Specification, Revision 2.0.