Texas Instruments XIO2001ZGU

Overview

XIO2001ZGU 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 six subordinate PCI bus masters, and delivers six configurable PCI clock outputs (25/33/50/66 MHz) - enabling legacy PCI expansion in modern PCIe-based enterprise servers and industrial control systems.

For engineers reviewing the XIO2001ZGU datasheet, XIO2001ZGU pinout, XIO2001ZGU application, or XIO2001ZGU equivalent, key selection criteria include its nFBGA-169 (ZWS) package compatibility, dual-reference-clock support (100-MHz differential or 125-MHz single-ended), ECRC-enabled advanced error reporting, and integrated AUX power switch for VAUX-only drain during main power-off states.

Technical Context

The XIO2001ZGU implements a robust pipeline architecture to minimize transaction latency, supporting up to eight posted and four non-posted downstream transactions and six posted and four non-posted upstream transactions. Its PCI Express interface operates at Gen1 ×1 speed with full compliance to Advanced Error Reporting, including ECRC generation and checking.

On the PCI side, it integrates an internal arbiter supporting up to six external PCI masters and provides full 66-MHz/32-bit throughput. Clock management includes six buffered PCI clock outputs and support for both 3.3-V and 5.0-V PCI bus signaling (with 5.0-V limited to 25/33 MHz), while power management features L0s/L1 ASPM, D1/D2/D3hot/D3cold states, and wake/beacon signaling.

Key Specifications

Pinout & Package

Package: 169-ball ZWS nFBGA (12.0 mm × 12.0 mm), lead-free, RoHS-compliant. Thermal pad on underside for enhanced heat dissipation in high-throughput bridge applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PLX PEX8112-AB50BC and Pericom PI7C9X2G304, the XIO2001ZGU uniquely combines native PCI 2.3 compliance, integrated VAUX switching, and dual-reference-clock flexibility - making it optimal for cost-sensitive, space-constrained legacy PCI integration where full Gen2 bandwidth or PCI-X support is unnecessary.

Availability

XIO2001ZGU is available at Aetrix Electronics and suitable for enterprise server expansion, industrial backplane design, and embedded retail terminal development requiring stable component supply and long-term lifecycle support.

Supply support for XIO2001ZGU 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 for industrial, automotive, and enterprise markets.

The XIO2001ZGU belongs to TI's PCI Express bridge product line, designed specifically to extend the life of legacy PCI peripherals in modern PCIe-based systems while meeting enterprise-grade reliability and power management requirements.

FAQ

What is the package type and pin count of the XIO2001ZGU?

The XIO2001ZGU uses a 169-ball ZWS nFBGA package (12.0 mm × 12.0 mm) with exposed thermal pad. This is distinct from other XIO2001 variants: ZAJ uses 144-ball nFBGA, and PNP uses 128-pin HTQFP. The ZGU suffix explicitly denotes the ZWS package per TI's orderable addendum.

Does the XIO2001ZGU support both 3.3-V and 5.0-V PCI bus signaling?

Yes, the XIO2001ZGU supports 3.3-V and 5.0-V PCI bus I/O tolerance via PCIR clamp rails. However, 5.0-V operation is restricted to 25 MHz or 33 MHz modes only - 66-MHz operation requires 3.3-V signaling. This is enforced by the M66EN and PCLK66_SEL pin configuration.

How does the XIO2001ZGU handle PCIe reference clock selection?

The XIO2001ZGU selects between 100-MHz differential and 125-MHz single-ended reference clocks using the REFCLK125_SEL pin. When low, it uses REFCLK+/REFCLK− differential pair; when high, it uses REFCLK+ as single-ended input with REFCLK− tied to VSS via capacitor. Both configurations are supported without external clock synthesis.

What power management features are implemented in the XIO2001ZGU?

The XIO2001ZGU implements D1/D2/D3hot/D3cold device states, L0s/L1 Active State Power Management, CLKRUN signaling, and WAKE output for link reactivation. It also includes an integrated AUX power switch that drains VAUX only when main power is off - satisfying PCIe power budget extensions for add-in cards.

Can the XIO2001ZGU operate without external PCI arbitration logic?

Yes, the XIO2001ZGU includes an internal PCI arbiter supporting up to six external PCI masters with configurable 2-level prioritization. External arbitration is optional and enabled only when EXT_ARB_EN is asserted high; otherwise, the internal arbiter manages GNT/REQ signals directly on the PCI bus.