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Simulation Driven Routing Rapid Adoption Kit (RAK) Product Version: ICADVM18.1.83 November 2018

Copyright Statement © 2018 Cadence Design Systems, Inc. All rights reserved worldwide. Cadence and the Cadence logo are registered trademarks of Cadence Design Systems, Inc. All others are the property of their respective holders. Learn more at Cadence Support Portal - https://support.cadence.com © 2018 Cadence Design Systems, Inc. All rights reserved worldwide. Page 2

Simulation Driven Routing (RAK) Contents Purpose ....................................................................................................................... 4 Audience ...................................................................................................................... 4 Terms .......................................................................................................................... 4 Interactive Router Bindkeys and Legends ................................................................... 4 Overview ...................................................................................................................... 5 SDR Flow .................................................................................................................... 6 Before You Begin......................................................................................................... 7 Module -1 Overview of SDR features .......................................................................... 8 Lab 1: Source/Sinks Map ......................................................................................... 9 Lab 2: Routing the net outp .................................................................................... 12 Lab 3: Check the routed net outp ........................................................................... 34 Module - 2 Routing with Tapering .............................................................................. 36 Lab 1: Route the net outm ...................................................................................... 36 Lab 2: Check the routed net outm .......................................................................... 41 Module - 3 Controlling the Twig generation ............................................................... 42 Lab 1: Route net net044 ......................................................................................... 42 Lab 2: Check the routed net net044 ....................................................................... 53 Module - 4 Fixing violations ....................................................................................... 54 Lab 1: Identifying and fixing violations .................................................................... 54 Summary ................................................................................................................... 67 Support ...................................................................................................................... 67 Feedback ................................................................................................................... 67 Learn more at Cadence Support Portal - https://support.cadence.com © 2018 Cadence Design Systems, Inc. All rights reserved worldwide. Page 3

Simulation Driven Routing (RAK) Purpose The purpose of this RAK is to guide you through the following basic commands of Simulation Driven Routing (SDR): • Current distribution visualization • Current estimation based on simulation • Auto-wire width/vias sizing • Auto-twig connection to devices The scope of this RAK is solely intended for SDR usage and not dataset generation from simulation or for ICT file creation for the extractor. Audience This document is intended for layout engineers working in Virtuoso EXL and for those who want to promote SDR capabilities in a layout design team. Terms Terms and Acronyms Definitions SDR ADE EAD EM LMB MMB RMB Virtuoso Simulation Driven Routing Analog Design Environment Electrically Aware Design Electro Migration Left Mouse Button Middle Mouse Button Right Mouse Button Interactive Router Bindkeys and Legends Terms and Acronyms Definitions Shift + Mouse Wheel click = (increase) / - (decrease) { t Blue Circle Yellow Circle Cycle Current Estimation Twig Layer controls. Layer Up/Down Cycle Auto Twig Mode Toggle Taper Mode Connected Pin Current Contributor Learn more at Cadence Support Portal - https://support.cadence.com © 2018 Cadence Design Systems, Inc. All rights reserved worldwide. Page 4

Simulation Driven Routing (RAK) Overview Virtuoso Simulation Driven Routing (SDR) is a step towards "correct by construction" routing driven by electrical requirements. It provides an environment to consider the current density and maximum resistance design rules during interactive routing. It is a solution where you take into consideration the current information and automatically resize wires and vias during interactive routing. Electromigration (EM) has a major impact on IC reliability and lifespan, a long-term concern for automotive, aerospace, and medical IC providers. EM has been an increasing problem and has become a challenge for the entire microelectronics industry as we move from higher to lower process nodes. SDR uses the electrical information derived from circuit simulation to drive optimal routing widths in layout implementation while maintaining EM compliance. The key features of Virtuoso® simulation-driven routing are as follows: • Visualize the current distribution per net. • Control simulation-driven routing to calculate the current according to the net topology • Auto-size wires and vias according to the estimated current. • Auto-connect devices according to the estimated current. Learn more at Cadence Support Portal - https://support.cadence.com © 2018 Cadence Design Systems, Inc. All rights reserved worldwide. Page 5

Simulation Driven Routing (RAK) SDR Flow In the SDR flow, the parasitic extraction and EM checks happen concurrently while the layout is implemented. In this case, the electrical impact is unknown until the layout is complete. In simulation driven routing, the EM constraints are considered during the layout implementation. This in turn decreases the number of iterations. Learn more at Cadence Support Portal - https://support.cadence.com © 2018 Cadence Design Systems, Inc. All rights reserved worldwide. Page 6

Simulation Driven Routing (RAK) Before You Begin Module and lab contents include the following database: SDR_RAK.tar.gz Action 1: In your terminal window type: tar -zxvf SDR_RAK.tar.gz Action 2: Go to the RAK directory cd SDR_RAK NOTE: You can refer to the setup.csh file to set the different environment variables and paths required to run the RAK. Modify the file as per your environment and source it. source setup.csh Action 3: Launch virtuoso virtuoso & Learn more at Cadence Support Portal - https://support.cadence.com © 2018 Cadence Design Systems, Inc. All rights reserved worldwide. Page 7

Simulation Driven Routing (RAK) Module -1 Overview of SDR features In this module you are going to explore the main features available in Simulation Driven Routing (SDR). You will route net “outp” using SDR and check for its EM compliance. SDR Toolbar Checker Type Checker Mode Current Estimation Mode Learn more at Cadence Support Portal - https://support.cadence.com © 2018 Cadence Design Systems, Inc. All rights reserved worldwide. Page 8

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