© 2021 Synopsys, Inc. 1

• The Best Timing-Aware IR ECO Flow Tweaker ECO with

RedHawk-SC

Len Hsu

Synopsys Taiwan Co., Ltd.

Tweaker ECO/RedHawk-SC Integration

The Best Timing-Aware Dynamic IR ECO Flow

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Agenda

Tweaker ECO Introduction

Traditional IR ECO Flow

Tweaker IR ECO/RedHawk-SC Flow

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Tweaker ECO

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Tweaker: Industry’s Leading Physical-Aware ECO SystemFastest turnaround time down to 3nm

EC

O • Timing

• Metal

• Clock

• Power

• Robustness

• IR

Re

co

ve

ry

• Area

• Leakage power

• Dynamic power

• Clock surgery

• Robustness

• Dynamic voltage drop

An

aly

tics • Intelligent

diagnosis

• Optimized ECO recipes

• Violation analysis

• Last-mile PPA closure R

ob

ust

GU

I • View• Netlist• Slack• Physical• Path• Schematic

• Map• Density• Congestion• Timing• Violation• IR….

70% of the top 20 semiconductor companies use Tweaker ECO

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• Widening convergence gap between implementation and signoff

• Lack of physical-rules awareness

• Perception that it is too late to repair for Dynamic Voltage Drop, without hurting timing

Signoff Design Closure Challenges are Continuing to Grow

Advanced

Nodes

Increasing

Design Size

Complicated

Physical Rules

Steep Corner

Count Increase

Stringent PPA

Goals

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Traditional IR ECO Flow

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Traditional IR ECO Design Flow

ECO Route

ECO.apr.tcl

Pre-ECO IR DB

P&R

ECO.v + ECO.def

APR ECO Flow

Change List

IR What-if Flow

or

Tweaker

IR SignoffPrimeTime Signoff

ECO.defor

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Traditional IR ECO Tweaker Flow

.lib .lef.v .def

.sdf .spef

TWF Slack report

Load Design Data

Bind Placement/Routing

Build Timing Corners

IR ECO

Output Result .v .def .spef .tcl

Physical Info.

begin_corner bc_rcbest

set_group -lib -name bc

set_group -spef -name

rcbest

set_group -sdf bc_rcbest

slackin bc_rcbest.rpt.gz

twfin bc_rcbest.twf.gz

end_corner bc_rcbest

begin_corner wc_cworst

set_group -lib –name wc

set_group -spef –name

cworst

set_group –sdf wc_cworst

slackin wc_cworst.rpt.gz

twfin wc_cworst.twf.gz

irdropin ir_to_tweaker.rpt.gz

end_corner wc_cworst

M.M.M.C.

Placement

Blockage

Routing

FinFET Rule

.upf

IR

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• Update timing, power, and congestion concurrently and rapidly.

Comprehensive GUI Designed for IR Drop Manual ECO

Dynamic Power Map

Timing Map

Toggle Rate Map

Congestion Map in Physical View IR Map

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Timing Aware, Automated DvD ECO Flow with

Tweaker/RedHawk-SC

Dynamic Voltage Drop ECO

Tweaker RedHawk-SC

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State of the Art Last-Mile Superior Design ClosureIntegrating industry’s best ECO and IR analysis tools in an integrated solution

Tweaker ECO

Golden-Signoff-

Driven ECO Technology

RedHawk-SC

Gold Standard Voltage Drop

PRIMETIME DRIVENBacked by Industry’s most

Trusted Timing Signoff-

Driven ECO Solution

ECO domain-architected to

handle very high-capacity

designs

Physical-aware ECO

placement engine

Industry’s Trusted Gold

Standard Voltage Drop

Minimizes the number of

ECO changes needed to fix

DvD timing issues

Capture and measure the

causes of dynamic IR-drop

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Stat of the art Ansys and Synopsys collaboration to ensure convergent last-mile closure

Tweaker-Redhawk-SC Dynamic IR-ECO

ECO Route

ECO.apr.tcl

Pre-ECO IR DB

P&R

ECO.v + ECO.def

APR ECO flow

ECO.spef

IR what-if flow

or

Tweaker IR ECO

(IR Aggressor Analysis/ECO)

RedHawk-SC

Signoff

PrimeTime

Signoff

RedHawk-SC

Incremental IR Update

ECO.defor

What-if

analysis

Convergent

Last-Mile

Design

Closure

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Incremental Automated IR Drop Update Methodology

• Autofix ECO solution for aggressor/victim cells

– Swap, Flip, Sizing, Move

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• Summary: Reduced ECO count by 57%

• Improved more than 40% cells IR drop violation

• Fixed more 20% cells IR drop violation

Traditional vs. Tweaker/RedHawk-SC Dynamic IR Drop

Case 1: Worst IR Drop Improved by 21.37%

Traditional IR-ECO

IR D

rop

Ra

tio

New: Tweaker/RedHawk-SC DvD Flow

IR Target: 12%

IR D

rop

Ra

tio

PRE IR VIOS

POST IR VIOS

Post ECO Worst IR Drop Post ECO Worst IR Drop

EC

O C

oun

t

IR V

io. C

oun

t

• Design: 2.8M instance counts (6nm)

• Target threshold: 12%

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Summary: Superior Last-Mile Design Closure

It is not too late to repair dynamic IR without

hurting timing

Multiple customers have realized gains and deployed in production

Timing Aware, Automated Dynamic Voltage

Drop ECO Flow

1

2

3

Thank You