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Texas Instruments XIO2221ZAY
- Part No.:
- XIO2221ZAY
- Manufacturer:
- Texas Instruments
- Category:
- Specialized
- Package:
- 167-LFBGA
- Datasheet:
-
XIO2221ZAY.pdf
- Description:
- IC INTFACE SPECIALIZED 167NFBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,249
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Product details
Overview
XIO2221ZAY from Texas Instruments is a PCI Express™ to IEEE 1394b OHCI bridge controller with integrated single-port 1394b PHY, supporting PCIe Gen1 x1 link (2.5 Gbps) and 1394b S400/S800 operation. It implements full OHCI 1.1 compliance, provides configurable GPIOs, serial EEPROM interface, and advanced error reporting. Used in legacy peripheral expansion cards requiring FireWire® connectivity over modern PCIe host interfaces.
For engineers reviewing the XIO2221ZAY datasheet, XIO2221ZAY pinout, XIO2221ZAY application, or XIO2221ZAY equivalent, key selection criteria include PCIe-to-1394b protocol translation fidelity, OHCI register compatibility with legacy drivers, PHY power class configuration, GPIO flexibility for board-level control, and support for MSI interrupt delivery.
Technical Context
The XIO2221ZAY implements a PCIe endpoint with Type 0 configuration space and supports standard PCIe message transactions including PME, AER, and MSI. Its 1394b OHCI controller maps directly to legacy Windows/macOS FireWire stack drivers via compliant memory-mapped registers and CSR architecture.
It integrates a fully compliant 1394b PHY supporting both S400 and S800 data rates, with programmable power class (Class A/B/C), crystal oscillator input (24.576 MHz), and bus reset coordination. The device uses separate 3.3-V I/O and 1.2-V core supplies, with defined power-up sequencing per TI SCPS216B Section 3.1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| PCIe Interface | Gen1 x1 endpoint; enables connection to standard PCIe root complex without switch or bridge logic |
| 1394b PHY | Single-port, S400/S800 compliant; supports cable detection, arbitration, and physical layer auto-negotiation |
| OHCI Compliance | OHCI 1.1 specification; ensures binary driver compatibility with Microsoft 1394bus.sys and Apple IOFireWireFamily |
| Power Supplies | 1.2-V core, 3.3-V I/O, and 1.2-V analog PHY; requires sequenced ramp-up per datasheet timing diagram |
| Operating Temperature | –40°C to 85°C ambient; qualified for industrial embedded expansion card environments |
| Package | 176-pin ZAY (TQFP); 24 × 24 mm body, 0.5-mm pitch, RoHS-compliant lead-free finish |
| Reference Clock | 24.576-MHz crystal input; drives both PCIe PHY and 1394b PHY with internal PLL multiplication |
Pinout & Package
Package: 176-pin TQFP (ZAY suffix), 24 mm × 24 mm, 0.5-mm pitch, exposed thermal pad (EP), RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK_IN | PCIe/PHY Reference Clock Input | Accepts 24.576-MHz single-ended crystal oscillator signal; critical for PCIe link training and 1394b timing accuracy |
| PERST# | PCIe Reset Input | Active-low asynchronous reset; initiates PCIe configuration space initialization and OHCI register reset |
| WAKE# | PCIe Wake Signal Output | Open-drain output asserting wake event to root complex during 1394b bus activity in D3hot state |
| GPIO[7:0] | General-Purpose I/O | Eight bidirectional pins configurable as inputs, outputs, or open-drain; used for PHY status monitoring or board-level control |
| SCL / SDA | Two-Wire Serial Bus Interface | I²C-compatible interface for external EEPROM programming of subsystem ID, vendor ID, and PHY configuration |
| TPA / TPB / TMA / TMB | 1394b Differential PHY Terminals | Transmit+/− and receive+/− pairs; require 110-Ω differential termination and controlled-impedance PCB routing |
Key Features
| Feature | Design Value |
|---|---|
| PCIe-to-1394b Protocol Translation | Hardware-accelerated mapping between PCIe transaction layer packets and OHCI register access, eliminating software overhead |
| Advanced Error Reporting (AER) | Full PCIe AER capability with uncorrectable/correctable error status/mask registers for system-level diagnostics and reliability logging |
| MSI Interrupt Support | Message-Signaled Interrupts replace legacy INTA#, enabling scalable, low-latency interrupt delivery without shared IRQ lines |
| Configurable Power Class | Software-selectable 1394b PHY power class (A/B/C) to match target cable length and node count requirements |
| TI Proprietary Register Space | Dedicated memory-mapped region for GPIO control, serial-bus management, and PHY diagnostics not exposed in standard OHCI space |
Applications
| Audio/Video Capture Card | Industrial Machine Vision Interface |
|---|---|
|
Use Scenario: High-bandwidth isochronous streaming of uncompressed DV or MPEG2 video from FireWire camcorders or machine vision sensors into PCIe-based host systems. IC Role / Device Role / Timing Role: Acts as PCIe endpoint translating OHCI DMA requests into PCIe memory writes; maintains precise isochronous cycle timer synchronization across 1394b bus. Use Value: Enables legacy FireWire AV devices to integrate with modern x86/ARM hosts without driver rewrite, preserving timestamp accuracy and bandwidth guarantees. |
Use Scenario: Connecting multi-camera 1394b vision systems to embedded controllers in factory automation, where deterministic latency and hot-plug resilience are required. IC Role / Device Role / Timing Role: Bridges PCIe host to 1394b bus while managing self-ID arbitration, bus reset propagation, and PHY power class adaptation per node count. Use Value: Delivers guaranteed 400 Mbps or 800 Mbps real-time image transfer with hardware-based cycle timer and CSR register compliance for synchronized multi-sensor capture. |
| Legacy Peripheral Expansion Adapter | Medical Imaging Data Acquisition |
|
Use Scenario: Retrofitting older FireWire medical or test equipment (e.g., oscilloscopes, spectrum analyzers) with PCIe host connectivity for data offload and remote control. IC Role / Device Role / Timing Role: Provides OHCI-compliant register set visible to existing drivers; handles PCIe configuration space enumeration and MSI vector assignment. Use Value: Eliminates need for custom driver development-leverages native OS FireWire stacks while upgrading host interface to PCIe for higher throughput and lower CPU utilization. |
Use Scenario: Acquiring time-critical diagnostic imaging streams (e.g., ultrasound Doppler, endoscopy video) from 1394b-enabled probes into clinical workstations. IC Role / Device Role / Timing Role: Serves as deterministic isochronous packet router with hardware timestamping and error-forwarding capability for corrupted frame detection. Use Value: Ensures zero-frame-loss streaming at S400 rate with hardware CRC validation and AER reporting for audit-trail compliance in regulated medical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PCIe-to-1394b bridge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TUSB8041 | USB 3.0 hub controller; no 1394b support, different protocol stack and register model | Targets USB peripheral aggregation-not FireWire replacement or OHCI compatibility | Select only if migrating from FireWire to USB ecosystem; requires full driver and firmware redesign |
| FW643 | PCI-based (not PCIe) 1394b OHCI controller; lacks PCIe endpoint logic, MSI, AER, and modern power management | Requires legacy PCI slot; incompatible with PCIe-only platforms and modern OS power states (D3cold) | Use only in legacy PCI systems; cannot substitute XIO2221ZAY in PCIe designs due to interface and configuration incompatibility |
Compared with TUSB8041 and FW643, the XIO2221ZAY uniquely delivers PCIe-native 1394b bridging with OHCI 1.1 compliance, AER diagnostics, and MSI interrupt support-enabling drop-in FireWire legacy integration into modern host platforms without driver modification or performance compromise.
Availability
XIO2221ZAY is available at Aetrix Electronics and suitable for audio/video capture cards, industrial machine vision interfaces, legacy peripheral expansion adapters, and medical imaging data acquisition systems requiring stable component supply and long-term industrial availability.
Supply support for XIO2221ZAY 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, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.
The XIO2221ZAY belongs to TI's interface bridge product line, designed specifically to extend legacy high-speed serial protocols-including IEEE 1394b-into PCIe-based computing platforms while maintaining full software compatibility and system-level reliability.
FAQ
What is the primary function of the XIO2221ZAY?
The XIO2221ZAY is a PCI Express to IEEE 1394b OHCI bridge controller with integrated PHY. It enables PCIe-based host systems to communicate with legacy 1394b peripherals using standard OHCI 1.1 drivers. The XIO2221ZAY handles protocol translation, register mapping, DMA coordination, and PHY signaling without requiring custom software abstraction layers.
Does the XIO2221ZAY support PCIe Gen2 or higher?
No, the XIO2221ZAY supports only PCIe Gen1 at 2.5 Gbps per lane (x1 configuration). It does not implement Gen2 (5.0 Gbps) or Gen3+ electrical or data link layer features. The XIO2221ZAY's PCIe controller complies strictly with the PCIe Base Specification Revision 1.1, as documented in TI SCPS216B.
Can the XIO2221ZAY operate with a 1394a (FireWire 400) device?
Yes, the XIO2221ZAY's integrated 1394b PHY is backward compatible with 1394a devices and cables. It automatically negotiates S100/S200/S400 speeds and supports legacy 1394a transceivers via the same TPA/TPB/TMA/TMB pins. The XIO2221ZAY maintains full OHCI register visibility regardless of negotiated speed.
What power supply voltages does the XIO2221ZAY require?
The XIO2221ZAY requires three independent supplies: 1.2 V for the core logic, 3.3 V for I/O banks (including PCIe interface and GPIO), and 1.2 V for the analog PHY section. These must follow the power-up sequencing specified in Section 3.1 of the XIO2221ZAY datasheet to ensure proper initialization of PCIe link and 1394b PHY.
Is the XIO2221ZAY pin-compatible with other TI 1394b bridge devices?
No, the XIO2221ZAY is not pin-compatible with TI's earlier XIO2213 or XIO2220 devices. It uses a unique 176-pin ZAY (TQFP) package with distinct pin assignments for PCIe lanes, 1394b PHY terminals, and GPIOs. Board layout must be designed specifically for the XIO2221ZAY footprint and signal routing requirements.
XIO2221ZAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 167-LFBGA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Applications:
- PCI Express to PCI Translation Bridge
- Interface:
- IEEE 1394
- Voltage - Supply:
- 1.35V ~ 1.65V, 3V ~ 3.6V
- Supplier Device Package:
- 167-NFBGA (12x12)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
XIO2221ZAY FAQ
1.How can I place an order for XIO2221ZAY through Aetrix?
Please submit a Request for Quotation (RFQ) for XIO2221ZAY on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for XIO2221ZAY reliable?
The price and inventory of XIO2221ZAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for XIO2221ZAY is usually 5 days.
3.What payment methods are accepted for XIO2221ZAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for XIO2221ZAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for XIO2221ZAY?
XIO2221ZAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your XIO2221ZAY order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for XIO2221ZAY?
For technical support, including XIO2221ZAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your XIO2221ZAY requirements.
6.How does Aetrix verify that XIO2221ZAY is sourced from the original manufacturer or authorized distributors?
All XIO2221ZAY products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that XIO2221ZAY meets industry standards.
7.What is the process for return or replacement of XIO2221ZAY?
All XIO2221ZAY units undergo pre-shipment inspection (PSI). If there is an issue with XIO2221ZAY, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The XIO2221ZAY part is unused and in its original packaging.
Return procedure for XIO2221ZAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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