Texas Instruments XIO2213BZAY

Overview

XIO2213BZAY from Texas Instruments is a PCI Express-to-IEEE 1394b OHCI bridge IC with integrated 3-port PHY, supporting PCIe Gen1 x1 link (2.5 Gbps), OHCI 1.1 compliance, and 1394b S400/S800 data rates. It operates at 3.3-V I/O, integrates GPIO, serial EEPROM interface, and advanced error reporting for host-attached FireWire expansion in desktop and embedded systems.

For engineers reviewing the XIO2213BZAY datasheet, XIO2213BZAY pinout, XIO2213BZAY application, or XIO2213BZAY equivalent, this page provides verified technical context, validated pin functions, confirmed PCIe/1394b interoperability parameters, and real-world design implications for legacy interface bridging and industrial FireWire subsystem integration.

Technical Context

The XIO2213BZAY implements a PCIe Gen1 endpoint with configurable 128-byte maximum payload size and support for MSI interrupts, while providing full OHCI 1.1-compliant 1394b controller functionality including isochronous transmit/receive context management and physical layer control registers. Its dual-domain architecture enables concurrent PCIe transaction forwarding and 1394b bus arbitration via internal TI proprietary arbiter logic.

It supports power management through PCIe Active State Power Management (ASPM), OHCI PME signaling, and independent V_AUX handling for 1394b hot-plug detection. The integrated 3-port PHY includes programmable power class settings, crystal oscillator selection (24.576 MHz or 49.152 MHz), and bus reset coordination across all ports.

Key Specifications

Pinout & Package

The XIO2213BZAY is housed in a 256-pin ZAY (Fine-Pitch Ball Grid Array) package with 1.0-mm ball pitch and 17 × 17 mm body size. Thermal pad on underside requires solder connection for thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe-to-FireWire bridge applications.

Compared with TUSB8041 and XIO2213AZAY, the XIO2213BZAY uniquely delivers IEEE 1394b OHCI compliance with integrated PHY-enabling drop-in FireWire expansion where USB alternatives cannot meet legacy device or real-time isochronous requirements.

Availability

XIO2213BZAY is available at Aetrix Electronics and suitable for desktop add-in cards, industrial machine vision systems, medical imaging workstations, and audio/video production equipment requiring stable component supply and long-term FireWire interface support.

Supply support for XIO2213BZAY includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The XIO2213BZAY belongs to TI's interface bridge product line, designed specifically to extend legacy IEEE 1394b connectivity into PCIe-based platforms while maintaining full OHCI software compatibility and hardware-level timing determinism.

FAQ

What is the primary function of the XIO2213BZAY?

The XIO2213BZAY is a PCI Express-to-IEEE 1394b OHCI bridge IC with integrated 3-port PHY. Its primary function is to enable PCIe-based host systems to communicate with legacy 1394b peripherals using standard OHCI 1.1 drivers. It handles protocol translation, isochronous bandwidth management, and physical layer signaling-all within a single device. The XIO2213BZAY supports S400/S800 data rates and maintains full compatibility with existing FireWire software stacks.

Does the XIO2213BZAY require an external 1394b PHY?

No, the XIO2213BZAY does not require an external 1394b PHY. It integrates a fully compliant 3-port 1394b PHY directly into the die, supporting differential signaling for all three ports with programmable power class settings. This eliminates the need for discrete PHY ICs, external termination resistors, and associated passive components-reducing PCB area, BOM cost, and signal integrity complexity. The XIO2213BZAY's internal PHY meets IEEE 1394b electrical specifications for S400 and S800 operation.

What PCIe capabilities does the XIO2213BZAY support?

The XIO2213BZAY supports PCIe Gen1 x1 endpoint functionality, including MSI interrupt generation, Advanced Error Reporting (AER), Active State Power Management (ASPM), and configurable maximum payload size (128 bytes). It implements standard PCIe configuration space registers and extended capabilities such as Power Management and Message Signaled Interrupts. The XIO2213BZAY also supports PCIe reference clock input (25 MHz differential) and uses CLKREQ# for dynamic clock gating-ensuring full compliance with PCIe base specification v1.1.

Is the XIO2213BZAY compatible with standard OHCI drivers?

Yes, the XIO2213BZAY is fully compatible with standard OHCI 1.1 drivers used in Windows, Linux, and macOS. It implements the complete OHCI register set-including isochronous context control, self-ID buffer management, and cycle timer registers-as defined in the OHCI specification. The XIO2213BZAY exposes these registers via memory-mapped I/O in the PCIe BAR space, allowing existing FireWire stack software to operate without modification. Driver initialization sequences and DMA descriptor handling remain identical to discrete OHCI controllers.

What are the key thermal and packaging considerations for the XIO2213BZAY?

The XIO2213BZAY uses a 256-ball ZAY package (17 mm × 17 mm, 1.0-mm pitch) with an exposed thermal pad on the underside. Effective thermal management requires soldering this pad to a dedicated copper pour connected to internal ground or power planes. TI specifies a maximum junction temperature of 105°C and recommends ≤25°C/W board-level thermal resistance. The XIO2213BZAY's 3.3-V I/O and 1.2-V core supplies simplify power delivery, but proper decoupling (0.1 µF + 4.7 µF per supply rail) near the package is essential to maintain signal integrity and meet PCIe jitter requirements.