The Texas Instruments XIO2213A is a PCI Express to PCI translation bridge where the PCI bus interface is internally connected to a 1394b open host controller link-layer controller with a three-port 1394b PHY. The PCI-Express to PCI translation bridge is fully compatible with the PCI Express to PCI/PCI-X Bridge Specification, Revision 1.0. Also, the bridge supports the standard PCI-to-PCI bridge programming model. The 1394b OHCI controller function is fully compatible with IEEE Standard 1394b and the latest 1394 Open Host Controller Interface (OHCI) Specification.The XIO2213A simultaneously supports up to four posted write transactions, four non-posted transactions, and four completion transactions pending in each direction at any time. Each posted write data queue and completion data queue can store up to 8K bytes of data. The non-posted data queues can store up to 128 bytes of data.The PCI Express interface supports a x1 link operating at full 250 MB/s packet throughput in each direction simultaneously. Also, the bridge supports the advanced error reporting capability including ECRC as defined in the PCI Express Base Specification, Revision 1.1. Supplemental firmware or software is required to fully utilize both of these features. Robust pipeline architecture is implemented to minimize system latency. If parity errors are detected, then packet poisoning is supported for both upstream and downstream operations.The PCIe Power management (PM) features include active state link PM, PME mechanisms, and all conventional PCI D-states. If the active state link PM is enabled, then the link automatically saves power when idle using the L0s and L1 states. PM active state NAK, PM PME, and PME-to-ACK messages are supported. The bridge is compliant with the latest PCI Bus Power Management Specification and provides several low-power modes, which enable the host power system to further reduce power consumptionEight general-purpose inputs and outputs (GPIOs), configured through accesses to the PCI Express configuration space, allow for further system control and customization.Deep FIFOs are provided to buffer 1394 data and accommodate large host bus latencies. The device provides physical write posting and a highly tuned physical data path for SBP-2 performance. The device is capable of transferring data between the PCI Express bus and the 1394 bus at 100M bits/s, 200M bits/s, 400M bits/s, and 800M bits/s. The device provides three 1394 ports that have separate cable bias (TPBIAS). As required by the 1394 Open Host Controller Interface Specification, internal control registers are memory-mapped and nonprefetchable. This configuration header is accessed through configuration cycles specified by PCI Express, and it provides plug-and-play (PnP) compatibility.The PHY-layer provides the digital and analog transceiver functions needed to implement a three-port node in a cable-based 1394 network. Each cable port incorporates two differential line ......