The Texas Instruments XIO2000AI is a single-function PCI Express to PCI bus translation bridge that 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 nonposted transactions for each enabled virtual channel. For upstream traffic, up to six posted and four nonposted transactions are simultaneously supported for each virtual channel. This report includes a circuit analysis on the Phase-Locked Loop and Clock Generation, the PCI Express Receiver, and the PCI Express Transmitter. The transmitter data selector and coding as well as other standard cell logic is also included.