Texas Instruments XIO2001ZWS

Overview

XIO2001ZWS from Texas Instruments is a single-function PCI Express to PCI bus translation bridge compliant with PCI Express Base Specification 2.0 and PCI Express to PCI/PCI-X Bridge Specification 1.0. It provides full ×1 PCIe throughput (250 MB/s bidirectional), supports 66-MHz/32-bit PCI local bus operation, and integrates an internal arbiter for up to six external PCI masters - enabling legacy PCI add-in cards in modern PCIe-based enterprise servers and industrial control systems.

For engineers reviewing the XIO2001ZWS datasheet, XIO2001ZWS pinout, XIO2001ZWS application, or XIO2001ZWS equivalent, this device serves as a critical interconnect solution where backward compatibility with 32-bit PCI peripherals is required without redesigning host infrastructure - especially in data center server expansion slots, factory automation backplanes, and ruggedized PC-based controllers.

Technical Context

The XIO2001ZWS implements a robust pipeline architecture to minimize transaction latency between its PCIe ×1 upstream interface and downstream 32-bit PCI bus. It supports simultaneous handling of eight posted and four non-posted transactions downstream, and six posted and four non-posted upstream - preserving bandwidth under mixed memory-mapped I/O and configuration access loads.

Its dual-clock domain design isolates the 100-MHz differential (or 125-MHz single-ended) PCIe reference clock from the configurable 25/33/50/66-MHz PCI bus clocks. Power management includes L0s/L1 active-state link power management, D1/D2/D3hot/D3cold states, and PCI Express Advanced Error Reporting with ECRC support - all implemented in hardware without firmware dependency for basic operation.

Key Specifications

Pinout & Package

Package: 169-ball ZWS nFBGA (12.00 mm × 12.00 mm), lead-free, 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-AB50BCF and PI7C9X110BNDE, the XIO2001ZWS delivers balanced feature depth - including ECRC, L0s/L1 ASPM, and integrated AUX power switching - within a compact 169-ball nFBGA footprint optimized for space-constrained server mezzanine and industrial control modules.

Availability

XIO2001ZWS is available at Aetrix Electronics and suitable for enterprise server expansion, industrial backplane interconnect, and PC-based factory automation requiring stable component supply and long-term lifecycle assurance.

Supply support for XIO2001ZWS 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 focused on analog, embedded processing, and connectivity technologies, serving industrial, automotive, and communications markets with high-reliability silicon solutions.

The XIO2001ZWS belongs to TI's PCI Express bridge product line, designed specifically to extend the life of legacy PCI peripherals in next-generation PCIe infrastructure - emphasizing protocol fidelity, power efficiency, and seamless integration into enterprise and industrial platforms.

FAQ

What is the primary function of the XIO2001ZWS?

The XIO2001ZWS is a single-function PCI Express to PCI bus translation bridge that enables legacy 32-bit PCI add-in cards to operate in modern PCIe-based systems. It handles protocol conversion, timing synchronization, and arbitration between the PCIe ×1 upstream interface and downstream PCI bus - all in hardware without requiring driver modifications. The XIO2001ZWS maintains full compliance with PCI Express Base Specification 2.0 and PCI Local Bus Specification 2.3.

Does the XIO2001ZWS support 66-MHz PCI bus operation?

Yes, the XIO2001ZWS supports 66-MHz PCI bus operation when M66EN is asserted high and PCLK66_SEL is configured appropriately. It also supports 25/33/50 MHz modes depending on voltage and configuration. At 5.0 V, only 25 MHz and 33 MHz are allowed per PCI specification - the XIO2001ZWS enforces this constraint through its internal logic and pin strapping. The XIO2001ZWS provides six buffered clock outputs to drive multiple PCI slots synchronously.

How does the XIO2001ZWS handle PCIe power management states?

The XIO2001ZWS supports D1, D2, D3hot, and D3cold device states, plus L0s and L1 Active-State Power Management (ASPM) for the PCIe link. It automatically enters L0s/L1 when packet activity ceases and exits on request via CLKREQ or WAKE. D3cold disables main power while retaining VAUX for wake event detection. The XIO2001ZWS implements these states in hardware - no firmware or software initialization is needed for basic entry/exit behavior.

Can the XIO2001ZWS be used with a 5.0-V PCI bus?

Yes, the XIO2001ZWS supports 5.0-V PCI bus signaling at 25 MHz and 33 MHz only - consistent with PCI Local Bus Specification 2.3. Its PCIR pins accept either 3.3-V or 5.0-V clamp rail voltages, and internal I/O buffers tolerate both levels. However, 66-MHz operation is restricted to 3.3-V PCI bus configurations. The XIO2001ZWS must be configured with appropriate PCIR resistor values and voltage rails to ensure safe 5.0-V interoperability.

What are the key differences between the ZWS and ZAJ nFBGA packages for the XIO2001ZWS?

The XIO2001ZWS ZWS package is a 169-ball nFBGA (12.00 mm × 12.00 mm), while the ZAJ variant is a 144-ball nFBGA (7.00 mm × 7.00 mm). Both are laminate-based, datasheet-equivalent electrically and footprint-compatible with their predecessor MicroStar Jr. BGA packages. The ZWS offers more I/Os and enhanced thermal performance due to larger die pad area - making it preferred for high-throughput or thermally constrained applications. The XIO2001ZWS ZWS pinout differs significantly from ZAJ, particularly in power distribution and clock routing.