TI’s PCI Express bridge chip, the XIO2000A, is an industry first. It is designed for seamless migration from the legacy PCI to the PCI Express interface. It bridges an x1 PCI Express bus to a 32-bit, 33/66-MHz PCI bus capable of supporting up to six PCI devices downstream. The XIO2000Afully supports PCI Express rates of 2.5 Gbps. Its architecture supports the PCI 2.3 interface. The chip’s design enables PC and I/O add-on card manufacturers to begin transitioning to native PCI Express technology while preserving compatibility with existing PCI system software and firmware.