Lambdapdk

Lambdapdk is a collection of open-source Process Design Kits (PDKs) that enable chip design across multiple technology nodes. Each PDK includes standard cell libraries, I/O libraries, and memory compilers with full integration into the SiliconCompiler build system and Lambdalib Verilog hardware abstraction library.

Why Lambdapdk?

Challenges

• PDK setup is complex and error-prone
• Technology-specific designs limit portability
• Commercial PDKs have restrictive licenses
• Scattered PDK sources with inconsistent interfaces

Solution

• Pre-configured PDKs ready for immediate use
• Lambdalib mapping enables design portability
• Fully open-source PDKs for research and education
• Unified API across all supported technologies

Supported PDKs

PDK	Node	Libraries	Source
ASAP7	7nm FinFET	Standard cells (RVT/LVT/SLVT), I/O, SRAM	Arizona State University
FreePDK45	45nm	Nangate standard cells, SRAM	NC State / Nangate
Sky130	130nm	Standard cells (HD/HDLL), I/O, SRAM	Google / Skywater
GF180	180nm	Standard cells (7T/9T), I/O, SRAM	Google / GlobalFoundries
IHP130	130nm SiGe	Standard cells, I/O, SRAM	IHP GmbH
Interposer	Multi-layer	Bump cells for chiplet integration	ZeroASIC

Quick Start

Installation

pip install lambdapdk

Basic Usage

from siliconcompiler import ASIC, Design
from siliconcompiler.targets import skywater130_demo

# Create design and add source files
design = Design("mydesign")
design.set_topmodule("mydesign", fileset="rtl")
design.add_file("mydesign.v", fileset="rtl")
design.add_file("mydesign.sdc", fileset="sdc")

# Create ASIC project and load target
project = ASIC(design)
project.add_fileset(["rtl", "sdc"])
skywater130_demo(project)

# Run the flow
project.run()
project.summary()

Available targets: asap7_demo, freepdk45_demo, skywater130_demo, gf180_demo, ihp130_demo, interposer_demo

Cell Library Inventory

ASAP7 (7nm)

Standard cell libraries with three threshold voltage variants:

Library	Type	Cells	Verilog
asap7sc7p5t_rvt	Regular Vt	~200	verilog
asap7sc7p5t_lvt	Low Vt	~200	verilog
asap7sc7p5t_slvt	Super Low Vt	~200	verilog

Cell categories: AND, OR, NAND, NOR, XOR, INV, BUF, MUX, DFF, Latch, Adder, Tie, Filler, Decap, Tap

Memory macros (fakeram7):

Configuration	Verilog
Single-port 64x32 to 8192x64	verilog
Dual-port 64x32 to 8192x64	verilog
True dual-port 64x32 to 8192x64	verilog

FreePDK45 (45nm)

Library	Type	Verilog
nangate45	Standard cells	lambda

Cell categories: AND, OR, NAND, NOR, XOR, INV, BUF, MUX, DFF, Latch, AOI, OAI, Tie, Filler, Tap

Memory macros (fakeram45):

Configuration	Verilog
64x32 to 512x64	verilog

Sky130 (130nm)

Library	Type	Cells	Verilog
sky130hd	High Density	~430 unique	verilog
sky130hdll	High Density Low Leakage	~140 unique	verilog
sky130io	I/O cells	Various	verilog

Cell categories: AND, OR, NAND, NOR, XOR, INV, BUF, MUX, DFF, Latch, AOI, OAI, Delay, Tie, Filler, Decap, Tap, Antenna

Memory macros (sky130sram):

Configuration	Verilog
1RW1R 64x256	verilog

GF180 (180nm)

Library	Type	Cells	Verilog
gf180mcu_fd_sc_mcu7t5v0	7-track	~230	verilog
gf180mcu_fd_sc_mcu9t5v0	9-track	~230	verilog
gf180mcu_fd_io	I/O cells	Various	verilog

Cell categories: AND, OR, NAND, NOR, XOR, INV, BUF, MUX, DFF, Latch, AOI, OAI, Tristate, Delay, Tie, Filler, Decap, Tap, Antenna

Memory macros (gf180sram):

Configuration	Verilog
64x8 to 512x8	verilog

IHP130 (130nm SiGe)

Library	Type	Verilog
sg13g2_stdcell	Standard cells	lambda
sg13g2_io	I/O cells	blackbox

Note: IHP130 cell views are provided by the IHP Open PDK.

Interposer

Library	Type	Description
bumps	Bump cells	Micro-bump cells for chiplet integration

Stackup variants: 3ML, 4ML, 5ML with 400um, 800um, and 2000um bump pitches.

Architecture

lambdapdk/
├── asap7/           # 7nm FinFET PDK
│   ├── base/        # Technology files, DRC rules
│   └── libs/        # Standard cells, I/O, memory
├── freepdk45/       # 45nm PDK
│   ├── base/
│   └── libs/
├── sky130/          # 130nm PDK
│   ├── base/
│   └── libs/
├── gf180/           # 180nm PDK
│   ├── base/
│   └── libs/
├── ihp130/          # 130nm SiGe PDK
│   ├── base/
│   └── libs/
└── interposer/      # Passive interposer
    ├── base/
    └── libs/

Contributing

We welcome contributions! Please report issues and submit pull requests at: https://github.com/siliconcompiler/lambdapdk/issues

License

This project is licensed under the Apache License 2.0.

Individual PDKs may have additional license terms:

PDK	License	Details
ASAP7	BSD 3-Clause	LICENSE
Nangate45	Nangate Open Cell Library License	LICENSE (non-commercial use)
Sky130	Apache 2.0	Via open_pdks
GF180	Apache 2.0	Via gf180mcu-pdk
IHP130	Apache 2.0	Via IHP-Open-PDK
Interposer	Apache 2.0	Copyright 2024 ZeroASIC Corp

Copyright 2023 Zero ASIC Corporation