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Google/SkyWater and the Promise of the Open PDK The New Ecosystem of Open Source Silicon Tim Edwards SVP Analog & Platform efabless efabless.com Open Circuit Design opencircuitdesign.com page 1 WOSET at ICCAD November 5, 2020

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Google/SkyWater and the Promise of the Open PDK

Tim Edwards efabless.com

Open Circuit Design efabless

WOSET at ICCAD November 5, 2020

pencircuitdesign.com

The New Ecosystem of Open Source Silicon

SVP Analog & Platform

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proprietary information in a Process Design Kit (PDK) Every EDA tool must have access to potentially Open source EDA tools Closed source IP Closed source PDK page 2

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proprietary information in a Process Design Kit (PDK) Device characteristics Design rules IP Libraries GDS data Timing characteristics SPICE models DRC/ERC Extraction Verilog models Every EDA tool must have access to potentially page 3

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Google/SkyWater and the Promise of the Open PDK

Here is the problem: Open source EDA tools Closed source PDK ? End User Closed source IP

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Here is another problem:

Google/SkyWater and the Promise of the Open PDK

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Open source EDA tools Closed source PDK Closed source IP Foundry, IP vendor Leaking information page 5

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User-facing EDA tools Closed source PDK Closed source IP Here is one solution (used at efabless): Open source PDK version Abstract IP views EDA tools behind firewall firewall End User page 6

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$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $$ $ Commercial EDA Tool Vendors Silicon Foundries page 7

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Google/SkyWater and the Promise of the Open PDK

Early open-source EDA tools SPICE Magic VIS/SIS IRSIM . . . page 8

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Google/SkyWater and the Promise of the Open PDK

SCMOS Scalable CMOS page 9

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Open source EDA tools Open source PDK Open source IP End User Here is the preferred solution: page 10

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https://github.com/google/skywater-pdk https://fossi-foundation.org/dial-up Slack channel: skywater-pdk.slack.com Join here: https://join.skywater.tools page 11

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130nm, 6 metal stack process page 12

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Non-Manufacturing Costs to Foundries The Business Case for an Open Source PDK Maintaining NDAs Customer Tracking Customer Support PDK Development Customer Support Download Sites Issue Tracking Documentation IP Library Development page 13

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Google/SkyWater and the Promise of the Open PDK

The Business Case for an Open Source PDK IP Library Development—Typical needs Digital Standard Cell Libraries Padframe I/O, ESD RAM, ROM Compilers Crystal Oscillator Voltage Regulator Bandgap Reference Power-on-Reset page 14

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Google/SkyWater and the Promise of the Open PDK

Bug fixes Design support New IP libraries User help, FAQ Research Bug reports Community PDK Public Repository New EDA tools Tool development The Business Case for an Open Source PDK page 15

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Google/SkyWater and the Promise of the Open PDK

fork and remix New IP libraries Community PDK Public Repository Github Repo Github Repo Github Repo Github Repo page 16

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Google/SkyWater and the Promise of the Open PDK

Google/SkyWater Open PDK: Emphasis on Open Source Tools Use of Common File Formats On-line Documentation SkyWater PDK Components: SPICE models (at all corners) DRC / ERC rules Standard cell libraries Primitive device libraries I/O Pad libraries SRAM cell layout page 17

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The Downside is the Challenge: Need new Open Source Tools Need full integrated flows Digital Mixed-Signal Analog page 18

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Bug Reporting and Fixing: Go to Issue Tracker Post reproducible example Patch gets pushed to repo Pull patched repo page 19

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Project Partners: OpenRAM UCSC https://github.com/VLSIDA/OpenRAM 2k×32 SRAM in SkyWater 130nm (Also see: fossi-foundation.org/dial-up/) page 20

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Project Partners: OSU Standard Cell Library OSU https://github.com/stineje/OSU_130_PDK (Also see: fossi-foundation.org/dial-up/) dffsx1 page 21

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Project Partners: OpenLane AUC https://github.com/efabless/openlane (Also see: fossi-foundation.org/dial-up/) page 22

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Project Partners: striVe processor efabless RISC-V (picoRV32) microcontroller picoRV32 core

penRAM

memory synthesized, placed, and routed with OpenLane (Also see: fossi-foundation.org/dial-up/) page 23

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Project Partners:

pen_pdks

Open Circuit Design http://opencircuitdesign.com/open_pdks page 24

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Liberty LEF GDS CDL/SPICE Verilog Documentation Standard Formats Magic techfile (.tech) Digital Standard Cells Primitive Devices I/O Cells Analog IP Memory IP Netgen setup file (.tcl) Qflow setup file (.sh) Magic PDK (.tcl) Graywolf setup file (.par) Magic startup script (.magicrc) Makefile FEOL/BEOL Options Libraries Templates foundry1/ libs.tech/ lef/ magic/ netgen/ qflow/ Foundry Data Custom Data Installed PDKs PDK1/ technology_root/ … libs.ref/ foundry2/ … PDK2/

pen_pdks PDK installation

configure make make install page 25

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Project Partners: Stefan Schippers xschem https://repo.hu/projects/xschem page 26

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New software projects: 2020 summer internships at efabless / Open Circuit Design Automatic Symbol Library Generation https://github.com/arjunr10/eda-symbol_libraries Arjun Rakheja

liberty file cell () function() cell () function() ...

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New software projects: 2020 summer internships at efabless / Open Circuit Design Automatic Schematic Generation https://github.com/aidangoettsch/asg.git Aidan Goettsch SPICE netlist to schematic page 28

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The Google/SkyWater shuttle runs on efabless: Free shuttle run sponsored by Google! (“free” as in beer) Coming end of November 2020 Experimentation Encouraged! Submit designs to: page 29

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The Google/SkyWater shuttle runs on efabless: “Caravel” user project harness user project area

management area

storage area (SRAM) 60-pin WLCSP bump bond 3.2× 5.3µm (picoRV32) page 30

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“Caravel” user project harness The Google/SkyWater shuttle runs on efabless: Submits project to efabless Gets back packaged parts and parts assembled on a development board Creates open-source IP The designer: Puts IP in the Caravel design Posts project on github page 31

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“Caravel” user project harness The Google/SkyWater shuttle runs on efabless: Google/SkyWater/efabless: Gets new open-source IP Enhances offerings for the next shuttle run Gets a community of designers page 32

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In Conclusion Google/SkyWater is publicly available on github Fully open-source process foundry description Fully open-source IP libraries Community of designers & developers Emphasis on open source tools Keep it open source! page 33