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PLX Technology

PLX Technology, Inc. was an American fabless semiconductor company specializing in the design and development of integrated circuits and software for PCI Express (PCIe) connectivity solutions.^[1] Founded in 1986 and headquartered in Sunnyvale, California, it targeted enterprise data centers, networking, storage, and server markets with high-performance silicon that accelerated data transfer in microprocessor-based systems.^[2] The company's innovations emphasized software-enriched devices for enhanced interoperability, performance, and differentiation in applications like high-resolution graphics, peer-to-peer traffic, and multicast support.^[3] PLX Technology's product portfolio centered on PCIe switches and bridges, such as the ExpressLane PEX series, which provided configurable lanes (up to 96 in advanced models) operating at speeds from Gen 1 (2.5 GT/s) to Gen 3 (8 GT/s), enabling multi-host connectivity and low-latency data routing.^[3] These solutions were integral to enterprise storage, telecommunications, and peripheral devices, with key offerings including the PEX 8747 (48-lane, 5-port switch) and PEX 8780 (high-bandwidth switch with management tools).^[4]^[5] The company also developed supporting software development kits (SDKs) like PlxCm for device configuration and diagnostics, facilitating rapid integration in customer systems.^[6] Over its history, PLX Technology grew through strategic acquisitions, including NetChip Technology in 2004 for USB expertise, Oxford Semiconductor in 2009 for Ethernet controllers, and Teranetics in 2010 for 10GBASE-T technology, expanding its connectivity portfolio.^[2] It went public on NASDAQ (PLXT) in 1999 and raised approximately $29.7 million across funding rounds before facing market challenges in the early 2010s.^[7] In August 2014, Avago Technologies Limited (predecessor to Broadcom Inc.) acquired PLX for $6.50 per share in an all-cash deal valued at about $309 million, integrating its PCIe assets into Broadcom's broader semiconductor offerings.^[1] Post-acquisition, PLX's technologies continue to underpin Broadcom's PCIe switch lineup, supporting modern data center and AI infrastructure demands.^[3]

Overview

Founding and Location

PLX Technology was founded in May 1986 by Michael J. Salameh, who served as its co-founder, Chief Executive Officer, and board member from inception.^[8] The company was established as a fabless semiconductor firm initially focused on developing connectivity chips to address emerging needs in data processing systems.^[7] The initial headquarters were located at 870 Maude Avenue in Sunnyvale, California, placing the company in the heart of Silicon Valley.^[9] This strategic location offered proximity to a dense concentration of semiconductor talent, research institutions, and technology partners, which supported early operational setup and innovation.^[10] From its outset, PLX Technology's mission centered on creating integrated circuits that facilitate high-speed data transfer, laying the groundwork for solutions in input/output interconnectivity.^[11] This focus positioned the company to capitalize on the growing demand for efficient data handling in computing environments during the late 1980s.^[12]

Core Business and Industry Role

PLX Technology specialized in the design of integrated circuits (ICs) focused on PCI Express (PCIe) and Ethernet connectivity solutions, targeting enterprise and embedded markets. These ICs served as critical components for high-performance computing environments, facilitating reliable data transfer between processors, peripherals, and storage devices. By developing semiconductor-based interconnect technologies, the company addressed the growing demand for scalable bandwidth in data-intensive applications.^[13]^[1] As a leader in high-speed data interconnects, PLX played a pivotal role in enabling connectivity for servers, storage systems, and networking equipment. Its solutions supported the integration of multiple devices within these systems, enhancing overall system performance and flexibility through advanced switching and bridging capabilities. This positioned PLX as a key supplier in the semiconductor industry, where its technologies were integral to the evolution of enterprise infrastructure.^[1]^[14] The company's market impact was significant in accelerating data transfer speeds in computing systems, particularly through its emphasis on PCIe switches and bridges that achieved market leadership with over 70% share in PCIe switch products. These innovations enabled higher bandwidth and lower latency, supporting the shift to PCIe Gen3 and beyond in data centers and embedded applications, thereby influencing the scalability of modern IT infrastructures.^[15]^[16]

History

Formation and Early Development (1986–1998)

PLX Technology, Inc. was incorporated in California on May 7, 1986, by Michael J. Salameh, with initial operations centered in Sunnyvale, California.^[11] The company initially pursued development of semiconductor devices across various industry standards for high-performance embedded systems.^[11] However, recognizing the emerging potential of the Peripheral Component Interconnect (PCI) bus standard, PLX shifted its research and development (R&D) focus in 1994 to I/O interface semiconductors and associated software tools optimized for PCI-based systems.^[17] This pivot emphasized enhancing data transfer efficiency in microprocessor environments, positioning PLX as an early innovator in PCI connectivity solutions.^[11] The company's first major PCI products emerged in the mid-1990s, including the PCI 9050 and PCI 9060 I/O accelerators, which facilitated seamless integration of local bus interfaces with the PCI bus for improved system performance.^[11] These chips addressed the need for high-speed data pathways in embedded applications, with the PCI 9050 supporting bus mastering and scatter-gather DMA operations to streamline transfers.^[18] By 1996, PCI-based semiconductors accounted for the majority of PLX's revenues, marking a successful transition from diverse standards to specialized interconnect technologies.^[11] Despite this progress, PLX encountered significant challenges in the nascent high-speed interconnect market, including intense competition from larger firms like Intel that integrated similar functions into their broader chipsets.^[11] Funding hurdles were also prominent, as the company relied on private equity investments—such as Series A through D preferred stock sales—to sustain R&D amid limited initial resources.^[11] Lengthy sales cycles, typically 6 to 12 months for customer evaluation followed by another 6 to 12 months for volume production, further strained operations in this competitive landscape.^[11] Key milestones during this period included the establishment of a dedicated core engineering team, which expanded to 31 R&D personnel by December 31, 1998, comprising experts in semiconductor design, software, and system integration.^[11] Under the leadership of Vice President of Engineering Kenyon Mei, appointed in August 1997, the team drove innovations in PCI data handling.^[11] By 1998, PLX had secured initial patents, including two related to I/O buffer and clock technologies for efficient data transfer, though the company primarily protected its PCI advancements through trade secrets due to the rapid evolution of the field.^[11] These efforts culminated in over 500 customers and net revenues of $26.3 million for the year, underscoring PLX's growing foothold in the PCI ecosystem before its public transition.^[11]

IPO and Expansion (1999–2008)

PLX Technology completed its initial public offering on April 5, 1999, pricing 4 million shares at $9 each on the Nasdaq under the ticker symbol PLXT, raising approximately $36 million in gross proceeds before underwriting discounts. The IPO provided capital to accelerate research and development efforts, particularly in emerging interconnect standards such as PCI Express (PCIe), which the company began exploring as a successor to traditional PCI architectures to support higher-speed data transfer in computing systems. Post-IPO, the stock surged amid the dot-com market enthusiasm, with shares rising over 400% from the offering price within months, reflecting investor optimism about PLX's position in the expanding I/O connectivity market. This rapid appreciation enabled the company to enhance its R&D investments, focusing on PCIe-compatible semiconductors for applications in personal computers and servers. In July 2000, PLX expanded its operations by opening an office in Austin, Texas, initially staffing it with two employees and planning to grow to five, as part of a strategy to leverage the region's engineering talent pool and proximity to manufacturing partners in the semiconductor industry. This move complemented the company's headquarters in Sunnyvale, California, and supported scaling production and design activities during a period of increasing demand for PCI-based bridges and switches. The Austin facility helped streamline operations as PLX transitioned from private to public company status, allowing better access to skilled personnel for ongoing product development without over-reliance on its core Bay Area location. Throughout the mid-2000s, PLX experienced revenue growth fueled by the widespread adoption of PCIe technology in PCs, servers, and storage systems, as the standard gained traction for enabling faster data throughput compared to legacy PCI. Net revenues climbed to $44.1 million in 2001, dipped to $34.8 million in 2002 amid broader market slowdowns, and rebounded to $38.0 million in 2003, with PCIe products emerging as a key driver by contributing to subsequent annual increases—reaching over $70 million by 2007 and approximately $88 million in 2008. This expansion underscored PLX's strategic pivot to PCIe solutions, which accounted for a growing portion of sales and helped the company achieve a peak market capitalization exceeding $1 billion during the early 2000s boom, highlighting its role in the evolving high-performance computing ecosystem.

Products and Technologies

PCI Express Connectivity Solutions

PLX Technology's PCI Express (PCIe) connectivity solutions centered on high-performance switches and bridges that enabled efficient data transfer in computing and networking environments. The company's flagship PCIe switches, such as the PEX8606, featured a 6-lane, 6-port Gen 2 architecture compliant with the PCI Express Base Specification revision 2.0, supporting transfer rates of up to 5.0 GT/s per lane for aggregate bandwidth reaching 24 Gbps.^[19] This non-blocking internal switch fabric allowed full line-rate performance across all ports, facilitating low-latency applications in communications and embedded systems by providing fan-out connectivity to multiple endpoints from a single upstream port.^[20] PCIe bridges from PLX, including the PEX8112, served as high-performance interfaces for migrating legacy PCI peripherals to modern PCIe systems, offering protocol translation between PCIe and PCI buses while maintaining throughput up to 2.5 Gbps.^[21] These bridges expanded server I/O capabilities by integrating older expansion cards into PCIe-based architectures, commonly used in data centers to enhance connectivity without full system overhauls. Similarly, PLX's switch and bridge designs incorporated retimer-like signal conditioning to mitigate latency and signal degradation over longer traces, supporting reliable operation in high-density server environments where I/O expansion is critical for scaling storage and networking. Key innovations in PLX's PCIe solutions included advanced power management through Active State Power Management (ASPM) support, enabling dynamic link power states (L0s and L1) to reduce consumption to as low as 1.3W typical for devices like the PEX8606 during idle periods.^[22] Additionally, full backward compatibility with PCIe Gen 1 (2.5 GT/s) ensured seamless integration with existing infrastructure, allowing gradual upgrades in bandwidth-intensive applications such as IO modules and line cards.^[19] These features prioritized energy efficiency and flexibility, making PLX products suitable for low-power embedded systems and high-throughput data center deployments.^[23]

Ethernet and Storage Technologies

PLX Technology developed a range of 10GBASE-T Ethernet physical layer (PHY) devices under its TeraPHY family, designed to enable high-speed local area network (LAN) connectivity over existing copper cabling. The TN8000 series transceivers, introduced in full production in 2009, supported 10 Gigabit Ethernet transmission up to 100 meters on Category 6A cabling while maintaining backward compatibility with lower speeds like 1000BASE-T and 100BASE-TX.^[24] These PHYs incorporated advanced digital signal processing to reduce power consumption, achieving as low as 3.5 W per port at full 10G operation over 100 meters.^[25] A key innovation in PLX's 10GBASE-T portfolio was the integration of energy-efficient features, including enhanced Energy Efficient Ethernet (eEEE), a customization of the IEEE 802.3az standard that allowed dynamic power scaling for both 10 Gigabit and Gigabit Ethernet modes. The third-generation TN8045 PHY, fabricated on a 40nm process node, further optimized efficiency with support for 10GBASE-KR backplane interfaces and reduced latency for enterprise networking applications.^[26]^[27] This focus on low-power PHYs complemented PLX's PCI Express solutions by facilitating hybrid interconnects in data centers and high-performance computing environments. In the realm of storage technologies, PLX played a significant role in Network Attached Storage (NAS) through its system-on-chip (SoC) solutions, which embedded connectivity chips to streamline data access over networks. The NAS 7800 family, based on technology from the 2009 acquisition of Oxford Semiconductor, integrated ARM-based processors, Gigabit Ethernet MACs, and SATA interfaces to support multi-client access for streaming high-definition media and file sharing in consumer and small office settings.^[28]^[29] Devices like the OXE810SE single-drive NAS SoC featured hardware-accelerated AES encryption, USB host ports, and seamless integration with 10/100/1000 Ethernet for secure, multi-protocol storage.^[30] By January 2010, PLX had shipped over one million NAS units incorporating these embedded chips, demonstrating strong market adoption for affordable, Linux-ready storage appliances. PLX also advanced storage peripherals with USB-to-PCI bridges, enabling efficient data transfer between USB interfaces and PCI Express buses in both consumer and enterprise applications. The OXPCIe family, including the OXPCIe952, provided multi-port USB 2.0 host controllers bridged to PCIe, supporting high-throughput connections for external hard drives and RAID enclosures without requiring additional drivers via compliance with the USB Mass Storage Class specification.^[31]^[32] These bridges, derived from PLX's 2004 acquisition of NetChip Technology, emphasized plug-and-play integration for portable storage, reducing latency and power draw in devices like SSDs and NAS extensions.^[33]

Acquisitions and Strategic Moves

Major Acquisitions

PLX Technology strategically acquired several companies between 2003 and 2010 to broaden its expertise in interconnect solutions, particularly in bridging and switching technologies for PCI-based systems, USB interfaces, Ethernet controllers, and high-speed networking. These moves enhanced PLX's product portfolio, enabling it to serve expanding markets in networking, storage, and data centers during a period of rapid evolution in semiconductor interconnect standards.^[17] In May 2003, PLX acquired HiNT Corporation for an aggregate purchase price of $15.6 million, including $3.6 million in cash and $9.6 million in common stock, plus assumed liabilities and acquisition costs, integrating HiNT's PCI bridge and PCI-X product lines into its offerings. This acquisition strengthened PLX's position in high-performance I/O connectivity for applications such as networking equipment and embedded systems, providing a foundation for future developments in advanced bus architectures. By combining HiNT's design expertise with PLX's sales channels, the deal accelerated PLX's market penetration in PCI-compatible solutions.^[34]^[17] The following year, in May 2004, PLX completed the acquisition of NetChip Technology Inc. by issuing approximately 2 million shares of its common stock. NetChip specialized in USB controller chips, and the deal extended PLX's capabilities into USB-to-PCI bridging, allowing the company to address growing demand for integrated connectivity in consumer electronics, peripherals, and industrial devices. This expansion diversified PLX's interconnect portfolio beyond traditional PCI domains into the burgeoning USB ecosystem.^[35]^[36] In January 2009, PLX acquired Oxford Semiconductor Inc. in a transaction involving 5.6 million shares of PLX common stock and a $14.2 million promissory note payable in stock subject to shareholder approval. Oxford's strengths in Ethernet controllers, UARTs, and storage interconnect chips bolstered PLX's Ethernet expertise, particularly for embedded and networking applications, and enhanced its competitive edge in high-speed data transfer solutions. The acquisition aligned with PLX's focus on scalable interconnect technologies, integrating Oxford's intellectual property to support advanced serial interfaces.^[37]^[38] Finally, in October 2010, PLX acquired Teranetics Inc. for approximately $36 million, comprising 7.4 million PLX shares valued at $27.6 million, $1.3 million in cash, promissory notes, and a prior $1 million bridge loan extended during negotiations. Teranetics developed 10GBASE-T Ethernet PHY chips, enabling PLX to enter the 10 Gigabit Ethernet silicon market and target data center and enterprise networking segments with cost-effective copper-based solutions. This deal significantly expanded PLX's reach into high-bandwidth Ethernet technologies, complementing its PCI Express offerings for converged infrastructure.^[39]^[40]

Divestitures and Failed Mergers

In 2012, PLX Technology pursued a strategic divestiture of its 10GBASE-T physical layer (PHY) assets to Aquantia Corp., aiming to sharpen its focus on core PCI Express (PCIe) technologies amid evolving market demands for high-performance interconnect solutions. The asset purchase agreement, signed on September 14, 2012, and completed on September 20, 2012, transferred PLX's TeraPHY 10GBASE-T integrated circuit family, including related intellectual property, engineering team, and customer contracts, to Aquantia, a specialist in high-speed Ethernet connectivity. This move allowed PLX to eliminate ongoing development costs associated with the Ethernet portfolio, which had been acquired earlier through the 2010 purchase of Teranetics, and redirect resources toward its leadership in PCIe switches and bridges, where it held a dominant market position.^[41]^[42]^[43] Earlier that year, PLX entered into a proposed merger with Integrated Device Technology, Inc. (IDT), announced on April 30, 2012, under which IDT would acquire all outstanding PLX shares for approximately $330 million, or $7 per share, comprising $3.50 in cash and 0.525 shares of IDT common stock per PLX share. The deal sought to combine PLX's PCIe expertise with IDT's broader semiconductor offerings but faced significant hurdles, including antitrust scrutiny from the U.S. Federal Trade Commission (FTC), which issued an administrative complaint in December 2012 citing competitive concerns in the PCIe switch market, where both companies were key players. Additionally, the exchange offer saw limited shareholder participation, with only about 51% of shares tendered by the deadline, falling short of the required threshold for completion. On December 19, 2012, the parties mutually terminated the agreement, with PLX agreeing to pay IDT a $13.20 million termination fee to cover expenses and cover the merger's collapse.^[44]^[45]^[46] These actions reflected PLX's broader strategy to streamline its portfolio in response to industry shifts favoring PCIe as the dominant interconnect standard for data centers and enterprise storage, reducing exposure to slower-growing Ethernet segments and mitigating risks from regulatory interventions in consolidation efforts. By divesting non-core assets and navigating the failed IDT merger, PLX positioned itself for greater operational efficiency, ultimately contributing to its attractiveness as an acquisition target in subsequent years.^[43]^[47]^[48]

Acquisition by Broadcom and Legacy

The 2014 Acquisition

On June 23, 2014, Avago Technologies Limited announced its agreement to acquire PLX Technology, Inc. in an all-cash transaction valued at approximately $309 million, or $6.50 per share.^[13] The deal was structured as a tender offer by an Avago subsidiary for all outstanding shares of PLX common stock, with the transaction funded from Avago's existing cash reserves and expected to close in the fourth quarter of Avago's fiscal year ending November 3, 2014, subject to customary closing conditions including regulatory approvals.^[1] The tender offer commenced shortly after the announcement and expired on August 11, 2014, with approximately 80.3% of PLX's outstanding shares tendered on a fully diluted basis.^[49] On August 12, 2014, Avago successfully completed the tender offer and the subsequent merger under Delaware law, making PLX a wholly-owned subsidiary of Avago and causing PLX's shares to cease trading on the NASDAQ Stock Market.^[49] This acquisition followed the termination of a proposed merger between PLX and Integrated Device Technology in 2012.^[47] The strategic rationale centered on PLX's leadership in PCI Express (PCIe) silicon and software connectivity solutions, which complemented Avago's existing server storage connectivity and networking application-specific integrated circuit (ASIC) products.^[13] Avago's CEO, Hock E. Tan, stated that the deal would broaden the company's portfolio in enterprise storage and networking end markets, particularly for next-generation data center architectures, and was expected to be immediately accretive to Avago's non-GAAP earnings per share.^[1] PLX's CEO, David Raun, noted that the transaction would deliver immediate value to stockholders while opening growth opportunities for employees.^[13]

Integration and Impact

Following the 2014 acquisition, Broadcom integrated PLX Technology's PCI Express (PCIe) silicon and software solutions into its existing portfolio of server-storage connectivity and networking application-specific integrated circuits (ASICs), thereby strengthening enterprise-grade data center offerings. This integration allowed Broadcom to leverage PLX's expertise in high-speed interconnects to enhance product performance in demanding environments such as storage arrays and networked systems. For instance, PLX's PCIe switch architectures, including the PEX series, were adapted and evolved under Broadcom to support multi-host configurations and peer-to-peer communications, reducing latency in complex setups.^[1]^[50] PLX's legacy endures through its foundational contributions to the evolution of PCIe standards, particularly in bridging legacy PCI systems to newer generations and facilitating widespread adoption in storage and networking applications. The company developed an extensive lineup of PCIe switches and bridges that ensured backward compatibility while enabling higher bandwidths, achieving PCI-SIG interoperability and compliance certification. These innovations, including early integrations of direct memory access (DMA) engines in switches, supported high-performance cluster interconnects and set benchmarks for reliable data transfer in enterprise hardware.^[51]^[52] As of 2025, the PLX brand has been completely phased out in favor of Broadcom's unified branding, yet its technological foundations continue to underpin advanced PCIe solutions deployed in AI data centers. Broadcom's PEX90000 series switches, which trace their architectural roots to PLX designs, provide up to 256 GB/s of bidirectional bandwidth in x16 port configurations for PCIe Gen 6, enabling scalable GPU interconnects for AI workloads. These components are critical in modern AI servers, where configurations with multiple switches manage hundreds of lanes to support accelerator clusters, contributing to the infrastructure powering large-scale machine learning deployments.^[53]^[54]^[55]

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Broadcom PCIe technology helps enable and accelerate AI ...
Apr 23, 2024 · Broadcom strongly believes PCIe technology will help enable and accelerate the creation of an AI infrastructure.Missing: PLX legacy impact
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Broadcom Itching To Get PCI-Express 6.0 Into The Field
Feb 26, 2025 · ... acquired PCI-Express switch maker PLX Technology back in June 2014 for $309 million. That acquisition happened – and before Avago bought ...Missing: HiNT | Show results with:HiNT<|separator|>