Cadence® system design and verification solutions, integrated under our Verification Suite, provide the simulation, acceleration, emulation, and management capabilities.
Verification Suite Related Products A-Z
Cadence® digital design and signoff solutions provide a fast path to design closure and better predictability, helping you meet your power, performance, and area (PPA) targets.
Full-Flow Digital Solution Related Products A-Z
Cadence® custom, analog, and RF design solutions can help you save time by automating many routine tasks, from block-level and mixed-signal simulation to routing and library characterization.
Overview Related Products A-Z
Driving efficiency and accuracy in advanced packaging, system planning, and multi-fabric interoperability, Cadence® package implementation products deliver the automation and accuracy.
Cadence® PCB design solutions enable shorter, more predictable design cycles with greater integration of component design and system-level simulation for a constraint-driven flow.
An open IP platform for you to customize your app-driven SoC design.
Comprehensive solutions and methodologies.
Helping you meet your broader business goals.
A global customer support infrastructure with around-the-clock help.
More Support Log In
24/7 Support - Cadence Online Support
Locate the latest software updates, service request, technical documentation, solutions and more in your personalized environment.
Cadence offers various software services for download. This page describes our offerings, including the Allegro FREE Physical Viewer.
The Cadence Academic Network helps build strong relationships between academia and industry, and promotes the proliferation of leading-edge technologies and methodologies at universities renowned for their engineering and design excellence.
Participate in CDNLive
A huge knowledge exchange platform for academia to network with industry. We are looking for academic speakers to talk about their research to the industry attendees at the Academic Track at CDNLive EMEA and Silicon Valley.
Come & Meet Us @ Events
A huge knowledge exchange platform for academia. We are looking for academic speakers to talk about their research to industry attendees.
Americas University Software Program
Join the 250+ qualified Americas member universities who have already incorporated Cadence EDA software into their classrooms and academic research projects.
EMEA University Software Program
In EMEA, Cadence works with EUROPRACTICE to ensure cost-effective availability of our extensive electronic design automation (EDA) tools for non-commercial activities.
Apply Now For Jobs
If you are a recent college graduate or a student looking for internship. Visit our exclusive job search page for interns and recent college graduate jobs.
Cadence is a Great Place to do great work
Learn more about our internship program and visit our careers page to do meaningful work and make a great impact.
Get the most out of your investment in Cadence technologies through a wide range of training offerings.
Overview All Courses Asia Pacific EMEANorth America
Instructor-led training [ILT] are live classes that are offered in our state-of-the-art classrooms at our worldwide training centers, at your site, or as a Virtual classroom.
Online Training is delivered over the web to let you proceed at your own pace, anytime and anywhere.
Exchange ideas, news, technical information, and best practices.
The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information.
It's not all about the technology. Here we exchange ideas on the Cadence Academic Network and other subjects of general interest.
Cadence is a leading provider of system design tools, software, IP, and services.
Get email delivery of the Cadence blog featured here
While there are multiple techniques for reducing power consumption, shutting off power domains is the main method used to reduce leakage power consumption. In power shut-off designs, there are multiple aspects designers need to take care of, including IR drop, turn-on time, rush current, and the number of power switches added. An earlier post in this Low Power blog, How Easy Is It to Switch Off Power? explored some of those issues.This post focuses on a specific challenge, the rush current.
To control rush current, designers need to run some trials and implement the enable chain in such way that the rush current is less than the average current drawn by the design. It also should have a minimal impact on the turn-on time.
When more simultaneous chains are implemented, there is smaller resistance per time step, leading to shorter ramp up times-- but there will be a larger rush current. If a longer chain depth is implemented, then it will take a longer time to turn on all switches with a longer ramp-up time, but there will be a smaller rush current. So ideally the user will balance the enable chain depth and the use of simultaneous chains for optimal rush current control versus ramp-up time.
There are multiple ways a designer can implement the enable chain. Below are some examples of how enable chains can be built.
Figure 1 - Ways to implement enable chains
The different ways to implement enable chains have their pros and cons, as shown in the illustrations below.
Figure 2 -- Pros and cons of different enable chain approaches
In order to support enable chaining requirements, there is a flexible power switch enable unchaining/chaining feature available with the Encounter Digital Implementation system. It allows the user to change the enable chaining with already placed power switches. The feature also allows the user to change the enable chain for all power switches in a power domain, or by area, or per selection.
Along with the enable connection styles shown in the pictures above, the feature allows the user to define the enable chaining in preferred horizontal or vertical direction, and also allows user to specify the maximum distance a switch can drive/connect in a left or right direction.
This feature set is very useful for users to change the power switch enable connection, and there are multiple examples of users using this command set to change the enable sequence/chain. The Encounter Digital Implementation System also has a GUI available under the Power-Multi Supply Voltage tab for users to try chaining options interactively.