P.A. Semi

P.A. Semi, originally known as Palo Alto Semiconductor, was an American fabless semiconductor company established in Santa Clara, California, in 2003. The company was founded by Daniel W. Dobberpuhl, a prominent processor designer associated with the DEC Alpha 21064 and StrongARM projects. Its engineering organization included roughly 150 people and drew on experience from several major processor programs, including Itanium, Opteron, and UltraSPARC. Jim Keller was among the notable engineers associated with the company. The company focused on designing high-performance processors that combined substantial computing capability with comparatively low power consumption. Its principal technology family was PWRficient, based on the PA6T processor core and compatible with the Power ISA. The PA6T was notable because it represented a new Power ISA core developed outside the traditional AIM alliance of Apple, IBM, and Motorola or Freescale, breaking a long period in which those companies had dominated development of such processors. Architecturally, the core was PowerPC version 2.04 compatible and used deep pipelining, out-of-order execution, and superscalar processing. P.A. Semi initially attracted attention because of possible links to Apple and the prospect that Apple might become a major customer. Those expectations were complicated by Apple's transition from PowerPC processors to Intel processors across its Macintosh product line. As a result, P.A. Semi publicly emphasized embedded applications rather than positioning PWRficient primarily as a Macintosh processor. The target markets included networking equipment and other specialized systems requiring a balance between performance and energy efficiency. Texas Instruments was an investor, and industry commentary suggested that Texas Instruments manufacturing facilities could be involved in producing PWRficient chips. PWRficient processors began shipping to selected customers, with broader worldwide availability planned for the fourth quarter of 2007. The best-known identified product was the PWRficient PA6T-1682M, which was later used in the AmigaOne X1000. The product line remained relatively specialized and did not become a mass-market processor platform. On April 23, 2008, Apple announced that it had acquired P.A. Semi for $278 million. The transaction brought the company's engineering team into Apple rather than functioning primarily as an acquisition of a continuing standalone processor brand. Because P.A. Semi's products used Power ISA while Apple was then using Intel processors in its principal computer lines, the strategic value of the deal was widely understood to be the acquired semiconductor expertise. At Apple's Worldwide Developers Conference in June 2008, Steve Jobs explained that the engineers would help Apple develop custom chips for the iPod, iPhone, and future mobile products, including the iPad. P.A. Semi reportedly remained willing to supply its PA6T-1682M processor on an end-of-life basis, subject to the transfer of its Power ISA license from IBM to the acquiring company. The standalone P.A. Semi business did not continue as an independent brand after the Apple acquisition. Its engineering capabilities were absorbed into Apple's silicon organization, associated with the group led by Johny Srouji. The longer-term significance of P.A. Semi was therefore less its commercial processor volume than its contribution of experienced CPU and system-on-chip designers to Apple's internal silicon effort. Apple began shipping custom processors with the A4 system-on-chip in 2010, and that work later developed into the A-series chips for mobile devices and the M-series Apple silicon processors introduced for Mac computers from 2020.

P.A. Semi was founded in Santa Clara, California, in 2003 by Daniel W. Dobberpuhl, whose prior work included leadership in the design of the DEC Alpha 21064 and StrongARM processors. The company assembled an approximately 150-person engineering team with experience spanning several important processor projects, including Itanium, Opteron, and UltraSPARC. This background gave the company credibility as an advanced processor-design organization despite its relatively small size and lack of an established mass-market product line. The business concentrated on the development of PWRficient processors built around the PA6T core. These chips were intended to provide strong performance while limiting power consumption, an attractive combination for embedded systems and networking equipment. The PA6T was compatible with PowerPC version 2.04 and supported a deeply pipelined, out-of-order, superscalar design. It was also described as the first Power ISA core designed from the ground up outside the long-standing AIM alliance of Apple, IBM, and Motorola or Freescale in roughly a decade. P.A. Semi's relationship with Apple was the subject of industry interest. Before the company's public product positioning became clear, there were expectations that Apple might become an important or premier user of its processors. Apple's move from PowerPC to Intel processors for its Macintosh computers weakened that possibility. When PWRficient was disclosed publicly, P.A. Semi instead focused on embedded applications and specialized equipment. Texas Instruments was an investor, and reports suggested that its fabrication plants might be used to manufacture PWRficient devices. Selected customers began receiving PWRficient processors, and worldwide release was anticipated for the fourth quarter of 2007. The PA6T-1682M became the company's most visible identified product and was used in the AmigaOne X1000. However, the product family remained focused on specialist applications rather than becoming a broadly adopted consumer CPU platform. Apple announced the acquisition of P.A. Semi on April 23, 2008, for $278 million. The deal included the company's engineering staff. At the time, P.A. Semi's Power ISA focus did not directly match Apple's Intel-based Macintosh processor strategy. Apple therefore treated the acquisition primarily as a way to obtain processor and chip-design talent. At the June 2008 Worldwide Developers Conference, Steve Jobs said the engineers would work on custom silicon for Apple's mobile and portable products, including the iPod, iPhone, and future iPad. After the transaction, P.A. Semi ceased operating as an independent semiconductor company. Its engineering team became part of Apple's silicon effort, associated with the organization led by Johny Srouji. The company reportedly offered to supply the PA6T-1682M on an end-of-life basis, provided that its IBM Power ISA license could be transferred to Apple. The principal legacy of P.A. Semi was its contribution to Apple's internal semiconductor capabilities. Apple shipped the A4 system-on-chip in 2010, and its custom silicon program subsequently expanded into the A-series processors for mobile products and the M-series processors used in Mac computers beginning in 2020.

• 2020

  Apple silicon expands to Mac computers

  [1]P.A. Semien.wikipedia.org

  Apple introduced its M-series Apple silicon for Mac computers, representing a later stage in the custom-chip strategy to which former P.A. Semi engineers contributed.

• 2010

  Apple begins shipping the A4 system-on-chip

  [1]P.A. Semien.wikipedia.org

  Apple began shipping its own custom processors with the A4 system-on-chip, a later development connected to the internal silicon effort strengthened by the P.A. Semi acquisition.

• 2008

  Apple acquires P.A. Semi

  [1]P.A. Semien.wikipedia.org

  Apple announced a $278 million acquisition of P.A. Semi, including its approximately 150-person engineering team.

• 2008

  Apple describes the engineers' intended role

  [1]P.A. Semien.wikipedia.org

  Steve Jobs said the acquired team would help Apple develop custom chips for mobile and future portable products.

• 2007

  PWRficient processors begin reaching selected customers

  [1]P.A. Semien.wikipedia.org

  The company began shipping PWRficient processors to selected customers and planned broader worldwide availability for the fourth quarter.

• 2003

  P.A. Semi is founded

  [1]P.A. Semien.wikipedia.org

  Daniel W. Dobberpuhl founded P.A. Semi, originally called Palo Alto Semiconductor, in Santa Clara, California.

P.A. Semi positioned itself as a specialist designer of powerful and energy-efficient Power ISA processors for embedded and other demanding systems. Its differentiation rested on an experienced processor-engineering team, an out-of-order superscalar architecture, and the attempt to deliver modern performance and power efficiency outside the established AIM semiconductor alliance.

• Processor family

  PWRficient

  PWRficient was P.A. Semi's principal family of high-performance, power-efficient processors based on the PA6T core. The family targeted embedded systems and specialized equipment, particularly applications such as networking where performance per watt was important. Its underlying design used Power ISA compatibility, deep pipelining, out-of-order execution, and superscalar processing.

• Embedded processor

  PWRficient PA6T-1682M

  The PA6T-1682M was the best-known identified PWRficient processor. It implemented P.A. Semi's PA6T architecture and was designed for demanding embedded and specialized computing applications. The chip was used in the AmigaOne X1000. P.A. Semi was reportedly prepared to supply it on an end-of-life basis after Apple's acquisition, subject to the transfer of the relevant Power ISA license.

• 2008

  Apple acquires P.A. Semi for its engineering capabilitiesM&A

  Background

  Apple was using Intel processors in its computer products, while P.A. Semi's commercial processors were based on Power ISA. The strategic rationale therefore centered on acquiring specialized processor-design talent rather than replacing Apple's existing computer CPU supplier with PWRficient.

  Action taken

  Apple announced the acquisition of P.A. Semi for $278 million and absorbed its approximately 150-person engineering organization.

  Aftermath

  P.A. Semi stopped operating as an independent brand. Its engineers contributed to Apple's internal custom-silicon organization, which later produced the A-series and M-series processor families.

  Acquisition price. $278 million (Announced April 23, 2008)

  Source

• 2008

  P.A. Semi supports a limited end-of-life supply planStrategy

  Background

  P.A. Semi's existing customers could still require the PA6T-1682M after the company became part of Apple, even though Apple's principal strategic objective was the engineering team.

  Action taken

  P.A. Semi indicated that it was willing to supply the PA6T-1682M on an end-of-life basis, dependent on transferring its IBM Power ISA license to Apple.

  Aftermath

  The standalone PWRficient product line did not become Apple's mainstream processor platform, while the acquired engineering expertise was redirected toward Apple's custom mobile and computer silicon.

  Source

• 2008

  Apple announces acquisition of P.A. Semi[1]P.A. Semien.wikipedia.org

  M&A

  Apple announced on April 23, 2008 that it would acquire P.A. Semi for $278 million. The transaction included P.A. Semi's approximately 150-person engineering team.

• 2008

  Apple explains the strategic purpose of the P.A. Semi acquisition[1]P.A. Semien.wikipedia.org

  M&A · Leadership change

  At Apple's Worldwide Developers Conference in June 2008, Steve Jobs said that P.A. Semi's engineers had been acquired to help develop custom chips for the iPod, iPhone, and future mobile products.

1. 1P.A. Semien.wikipedia.org