Texas Instruments XIO2000AZAV

Overview

XIO2000AZAV from Texas Instruments is a PCI Express to PCI bus translation bridge IC that enables legacy PCI peripherals to operate in PCIe-based host systems. It supports PCIe 1.0a (2.5 GT/s) upstream and 33 MHz 32-bit PCI bus downstream, features integrated configuration space translation, advanced error reporting, and hardware-accelerated lock conversion. It is used in industrial control backplanes and embedded computing upgrades where PCIe-to-PCI protocol bridging is required.

For engineers reviewing the XIO2000AZAV datasheet, XIO2000AZAV pinout, XIO2000AZAV application, or XIO2000AZAV equivalent, this page provides verified technical context, validated pin functions, confirmed PCIe/PCI timing compliance, and real-world deployment constraints for system integration and BOM replacement.

Technical Context

The XIO2000AZAV implements a full-function PCIe-to-PCI bridge with dual-domain clocking: a 100 MHz differential PCIe reference clock input and a 33 MHz PCI bus clock output. It handles Type 0/Type 1 configuration transactions, translates PCI Express Message Signaled Interrupts (MSI) into PCI INTx assertions, and forwards PME events across domains.

It supports PCI Express Advanced Error Reporting (AER), per-VC arbitration via 128-phase weighted round-robin (WRR), and four configurable upstream isochronous windows for time-sensitive traffic. The device includes a two-wire serial-bus interface for EEPROM configuration and GPIO control registers for board-level signaling coordination.

Key Specifications

Pinout & Package

Package: 324-pin MicroStar BGA (ZAV), 27 mm × 27 mm, 1.0 mm ball pitch, bottom-side thermal pad, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCI Express-to-PCI bridge applications.

Compared with PEX8112-AA66BCF and PI7C9X2G304SV, the XIO2000AZAV delivers unique value in deterministic isochronous bandwidth allocation and comprehensive AER diagnostics-critical for industrial and medical systems where timing predictability and field-failure traceability are mandatory.

Availability

XIO2000AZAV is available at Aetrix Electronics and suitable for industrial backplane upgrades, embedded medical imaging systems, and avionics data acquisition modules requiring stable component supply and long-term lifecycle support.

Supply support for XIO2000AZAV 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 specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The XIO2000A family was designed specifically for high-reliability PCIe-to-PCI protocol bridging in mission-critical embedded systems where deterministic timing, error visibility, and long-term manufacturability are essential.

FAQ

What is the primary function of the XIO2000AZAV in a system architecture?

The XIO2000AZAV serves as a protocol translation bridge between a PCI Express host (upstream) and legacy PCI peripherals (downstream). It performs real-time translation of PCIe packets to PCI transactions-including configuration, memory, and I/O cycles-while maintaining timing integrity, interrupt mapping, and power management state synchronization. Its role is foundational in extending the life of PCI-based hardware in modern PCIe platforms.

Does the XIO2000AZAV support PCIe 2.0 or higher data rates?

No, the XIO2000AZAV is compliant only with PCI Express 1.0a specifications and operates at 2.5 GT/s on a single lane. It does not support PCIe 2.0 (5 GT/s) or later generations. This limitation is inherent to its silicon design and documented in the SCPS155C data manual. Systems requiring higher bandwidth must consider newer-generation bridges or alternate architectures.

How does the XIO2000AZAV handle PCI bus lock cycles in PCIe environments?

The XIO2000AZAV implements hardware-accelerated lock conversion, translating PCIe locked read/write sequences directly into native PCI lock cycles without CPU intervention. This preserves atomicity and ordering guarantees required by legacy PCI devices-such as shared memory-mapped peripherals-and avoids software emulation overhead or timing violations that could occur with generic transaction translation.

Can the XIO2000AZAV be used with 66 MHz PCI buses?

No, the XIO2000AZAV supports only 33 MHz PCI bus operation. Its electrical characteristics, timing parameters, and PCI interface logic are specified exclusively for 33 MHz, 32-bit PCI per PCI Local Bus Specification Revision 2.3. Attempting to run at 66 MHz violates setup/hold timing margins and is not supported by the device's internal clocking architecture or qualification testing.

What package type and thermal characteristics apply to the XIO2000AZAV?

The XIO2000AZAV uses a 324-pin MicroStar BGA package (ZAV suffix), measuring 27 mm × 27 mm with 1.0 mm ball pitch. It features an exposed thermal pad on the underside for enhanced heat dissipation and is rated for operation from –40°C to +85°C ambient. Thermal resistance (θ_JA) is 22.5°C/W under JEDEC JESD51-7 conditions, requiring appropriate PCB copper area and via stitching for reliable thermal performance.