Tag Archives: PDK

GlobalFoundries joins Google’s open source silicon initiative

Over the last year we have been busy planning the expansion of our free open source silicon design and manufacturing program to further grow the community of developers and companies building custom silicon, and build a thriving ecosystem around open source hardware.

Today, we’re excited to announce an expansion of this program and our partnership with GlobalFoundries. Together, we're releasing the Process Design Kit (PDK) for the GlobalFoundries 180MCU technology platform under the Apache 2.0 license, along with a no-cost silicon realization program to manufacture open source designs on the Efabless platform. This open source PDK is the first result of our ongoing partnership with GF. Based on the scale and breadth of GF’s technology and manufacturing expertise, we expect to do more together to further access and innovation in semiconductor development and manufacturing.
GF180MCU 1P5M 5 metals stack-up, 9kA top metal, with MIM between M3 and M4 layers.
Google started this program with SkyWater Technologies, by releasing one of their PDKs under the Apache 2.0 license. We sponsored six shuttle runs over the course of two years, allowing the open source community to submit more than 350 unique designs of which around 240 were manufactured at no-cost.
We cannot understate the milestone that this new partnership represents in the foundry ecosystem market.

Over the past few years, the world has experienced an unprecedented acceleration of adoption of digital capabilities—driven by the pandemic, and technology megatrends that have shifted every aspect of human life. According to GlobalFoundries, this has led to roughly 73% of foundry revenue being associated with high growth markets such as mobile, IoT, and automotive. This transition has not only given rise to a “New Golden Age” of semiconductors but also a tectonic shift in how we define and deliver innovation as an industry.  

Specifically, applications using 180nm are at a global capacity of 16+ million wafers a year and bound to grow to 22+ million wafers in 2026, according to GlobalFoundries.

The 180nm application space continues to see strong market traction in motor controller, RFID, general purpose MCUs and PMIC, along with emerging applications such as IoT Sensors, Dual Frequency RFID and Motor Drive.

The collaboration between GlobalFoundries and Google will help drive innovation for the application and silicon engineers designing in these high growth areas, and is an unambiguous affirmation of the viability of the open source model for the foundry ecosystem.

The GF 180nm technology platform offers open source silicon designers new capabilities for high volume production, affordability, and more voltage options. This PDK includes the following standard cells
  • Digital standard cells libraries (7-track and 9-track)
  • Low (3.3V), Medium (5V, 6V) and High (10V) voltage devices
  • SRAM macros (64x8, 128x8, 256x8, 512x8)
  • I/O and primitives (Resistors, Capacitors, Transistors, eFuses) cells libraries
Open sourcing more PDKs is a critical step in the development of the open source silicon ecosystem:
  • Open source EDA tools can now add support for multiple process technologies.
  • Researchers can produce fully-reproducible designs against multiple technology baselines.
  • Popular open source IP blocks can be ported to different process technologies.
We cannot build this on our own, we need you: software developers and hardware engineers, researchers and undergrad students, hobbyists and industry veterans, new startups and industry players alike, to bring your fresh ideas and your proven experiences to help us grow the open source silicon ecosystem.

We encourage you to:
By Johan Euphrosine and Ethan Mahintorabi – Hardware Toolchains Team

SkyWater and Google expand open source program to new 90nm technology

Today, Google is announcing the expansion of our partnership with SkyWater Technology. We are working together to release an open source process design kit (PDK) for SKY90-FD, SkyWater’s commercial 90nm fully depleted silicon on insulator (FDSOI) CMOS process technology. SKY90-FD is based on MIT Lincoln Laboratory’s 90 nm commercial FDSOI technology, and enables designers to create complex integrated circuits for a diverse range of applications.

Over the last two years, Google and SkyWater Technology have partnered to make building open silicon accessible to all developers, starting with the open source release of the SKY130 PDK and continuing with a series of no-cost manufacturing shuttles for developers in the open source hardware ecosystem. To date, Google has sponsored six shuttles on the Efabless platform, manufacturing 240 designs from over 364 community submissions. This is the first partnership of its type ever launched, and the results to date have been impressive.
The latest MPW-6 shuttle received 90 submissions from a diverse community across 24 different countries:

Over the coming months, we'll work closely with SkyWater Technology to release their new SKY90-FD PDK under the Apache 2.0 license and organize additional Open MPW shuttles to manufacture open source designs for this new 90nm FDSOI technology, through the Efabless platform.

We believe that having access to different technologies through open source PDKs is critical to grow and strengthen the open silicon ecosystem:
  • Developers can go beyond the constraints of their familiar process nodes and explore different performance, power and area trade offs with existing or new designs.
  • Researchers can reproduce their research on different technologies to produce diverse figures of merit.
  • Tool maintainers can generalize their technologies' backends to support more than one process.
  • The community can refine the ways we structure, distribute and maintain these PDKs.
SKY90-FD is a 90nm FDSOI process. Unlike a traditional CMOS BULK process, SKY90-FD features a thin layer of insulator material between the substrate and the upper silicon layer. This thin oxide process allows the transistor to be significantly thinner than in the BULK process, allowing the device to be “fully depleted,” and simplifying the fabrication process. This extra insulation greatly reduces parasitic current leakage and lowers junction capacitances, providing improved speed and power performance under various environmental conditions.
The SKY90-FD process stack topology features 5x thin Copper base metal layers for the main interconnect and two extra thicker Al (Aluminum) metal layers capable of conducting higher current.
Google is excited about the new range of applications this open source PDK will enable once it's released later this year, and we can't wait to hear from you and watch the growing stream of innovative project ideas originating from the open silicon community.

In the meantime, make sure to check https://developers.google.com/silicon for resources and pointers to start your open silicon journey!


By Johan Euphrosine and Ethan Mahintorabi – Hardware Toolchains Team