Texas Instruments XIO2001IZGUR

Overview

XIO2001IZGUR from Texas Instruments is a single-function PCI Express to PCI bus translation bridge compliant with PCI Express Base Specification 2.0 and PCI Local Bus Specification 2.3. It provides full ×1 PCIe throughput (250 MB/s bidirectional), supports 32-bit/66-MHz PCI bus operation, and integrates an internal arbiter for up to six external PCI masters. It is deployed in enterprise server add-in cards requiring legacy PCI device integration via modern PCIe host interfaces.

For engineers reviewing the XIO2001IZGUR datasheet, XIO2001IZGUR pinout, XIO2001IZGUR application, or XIO2001IZGUR equivalent, key selection considerations include its dual-voltage PCI bus I/O tolerance (3.3-V/5.0-V), support for Active-State Power Management (L0s/L1), advanced error reporting with ECRC, and configurable clock outputs (25/33/50/66 MHz).

Technical Context

The XIO2001IZGUR implements a robust pipeline architecture to minimize transaction latency between PCIe and PCI domains. It handles up to eight posted and four non-posted downstream transactions, and six posted and four non-posted upstream transactions simultaneously.

Its PCI Express interface uses a high-speed differential transceiver (TXP/TXN, RXP/RXN) with 100-MHz differential or 125-MHz single-ended reference clock support. The PCI bus side features full 32-bit/66-MHz timing compliance, LOCK support, and integrated arbitration logic with configurable priority for subordinate masters.

Key Specifications

Pinout & Package

Package: Lead-free 144-ball ZAJ nFBGA (7.00 mm × 7.00 mm), RoHS-compliant, thermal pad exposed on bottom.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PEX8112-AA50BCF and PI7C9X2G304SV, the XIO2001IZGUR uniquely combines 5.0-V PCI bus tolerance, integrated VAUX power switching, and full D3cold support-making it optimal for enterprise and industrial systems requiring legacy voltage compatibility and rigorous power-state compliance.

Availability

XIO2001IZGUR is available at Aetrix Electronics and suitable for enterprise server add-in cards, industrial control backplanes, retail point-of-sale terminals, and medical imaging subsystems requiring stable component supply and long-term lifecycle support.

Supply support for XIO2001IZGUR 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 leader specializing in analog, embedded processing, and connectivity solutions with over 50 years of innovation in industrial, automotive, and enterprise infrastructure markets.

The XIO2001IZGUR belongs to TI's PCI Express bridge product line, designed specifically to enable seamless integration of legacy PCI peripherals into modern PCIe-based computing platforms while meeting stringent power, timing, and reliability requirements.

FAQ

What is the primary function of the XIO2001IZGUR?

The XIO2001IZGUR is a single-function PCI Express to PCI bus translation bridge that enables communication between a PCIe host and legacy PCI peripherals. It fully complies with PCI Express Base Specification 2.0 and PCI Local Bus Specification 2.3. The XIO2001IZGUR handles protocol conversion, timing synchronization, address decoding, and arbitration-allowing systems like enterprise servers or industrial controllers to retain investment in PCI-based hardware while upgrading to PCIe infrastructure.

Does the XIO2001IZGUR support 5.0-V PCI bus signaling?

Yes, the XIO2001IZGUR supports both 3.3-V and 5.0-V PCI bus I/O tolerance on its AD[31:0], C/BE[3:0], and control signals. This is achieved via the PCIR pins, which connect to the secondary PCI bus clamp rail through 1-kΩ resistors. The XIO2001IZGUR operates at 25 MHz or 33 MHz when 5.0-V signaling is used, ensuring compatibility with legacy 5-V PCI cards without level-shifting circuitry.

How does the XIO2001IZGUR manage power states during PCIe link idle periods?

The XIO2001IZGUR implements Active-State Power Management (ASPM) with L0s and L1 states to reduce power when PCIe packet activity is idle. It also supports D1, D2, D3hot, and D3cold device states. The WAKE and PME pins provide event-driven reactivation of main power rails and clocks. The XIO2001IZGUR's integrated AUX power switch ensures VAUX power is drained only when main power is off-critical for hot-swap and battery-backed applications.

Can the XIO2001IZGUR be used with an external PCI arbiter?

Yes, the XIO2001IZGUR supports external arbitration via the EXT_ARB_EN pin. When EXT_ARB_EN is asserted high, the internal arbiter is disabled and the bridge operates in passive mode, allowing an external arbiter to manage PCI bus grants and requests. In this configuration, REQ0 functions as the bridge's GNT signal, and GNT0 serves as the bridge's REQ. The XIO2001IZGUR retains full transaction handling capability regardless of arbitration mode.

What clock output frequencies does the XIO2001IZGUR provide for the PCI bus?

The XIO2001IZGUR provides six buffered PCI clock outputs (CLKOUT0–CLKOUT6) configurable for 25 MHz, 33 MHz, 50 MHz, or 66 MHz operation. Frequency selection is controlled by M66EN and PCLK66_SEL pins. When 66-MHz mode is enabled (M66EN = 1), CLKOUT6 must be connected to the CLK input to synchronize the PCI bus core. The XIO2001IZGUR ensures jitter performance and drive strength meet PCI timing requirements across all supported frequencies.