Cadence® system design and verification solutions, integrated under our System Development Suite, provide the simulation, acceleration, emulation, and management capabilities.
System Development 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.
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 technlogy. 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
In Part 1 of this series on Android System Verification I provided the basics about how to run the Android emulator. When I initially looked at the emulator I was looking for information about available verification techniques, primarily at the system level. I surmised that many Android projects aggregate the available software, add some new custom software to support a specific hardware platform, enable the wide range of available applications, and put all of this together to create a product. Android provides a very high level of design reuse, which is great, but reuse can also be error prone. In fact, hardware verification engineers commonly tell stories about how they pay very close attention to verification on a new design and take nothing for granted. Then, on "derivative" designs less attention is paid to verification (since not much is changing is should take less time) and sometimes issues escape the verification process. Interestingly, the escapes usually have to do with design blocks that were throughly verified and used on previous projects, but when placed into new circumstances had a problem. ISX users also describe how software changes can cause hardware issues to come out in hardware blocks that were fine on the previous project. My hypothesis is that embedded software is the same. Typically it runs very well in some set of circumstances, but when things change around it may not behave as well.
Here are a few testing techniques available in Android:
I'm going to skip over Java unit testing, since my focus is on system verification, not individual blocks of Java code.
Monkey provides a way to generate pseudo-random streams of user events. It is meant to stress test applications, just as if a monkey was pounding on the keyboard or screen (and hopefully not breaking it). Monkey takes a seed as input to a random generator so that the tests are repeatable. It can be applied to either all of the Android software applications or can be constrained to a list of packages or a category of packages. Monkey is actually a program running inside the device (the trade off between generating stimulus inside a system vs. from the outside is a topic for another time). Because it is run on the target system, it is started using the Android Debug Bridge (adb), a tool providing many useful services for interacting with a target device from the host machine.
Monkey is started using adb shell, for example:
% adb shell monkey –v 500 –s 2
will run monkey on all of the software with verbose mode on, random seed 2, and 500 events generated. Monkey appears to be useful for testing application and cheaper than hiring an actual monkey to do the testing.
The emulator console turned out to be more interesting for me because it allows hardware commands to be sent to the system. As I mentioned in Part 1 I feel like big improvements are possible in the hardware stimulus generation and checking that is currently used in Virtual Platforms like the Android emulator. The emulator console can dynamically query and control the simulated device over a telnet connection.
To connect to the console use:
% telnet localhost 5554
Here is the output of the help command, you can read about all the commands in the documentation.
Using the emulator console you can issue a variety of hardware commands, here are the main categories of commands:
Use the documentation details to issue these commands from a telnet session and see things happen on the phone, it's pretty cool. My kids were convinced it was a real phone and somebody was trying to call me. The emulator actually rings when a call comes in.
Here are some screen shots I took of the emulator running.
Of course, the GPS shows I'm located in Minnesota.
Give it a try, and next time we will get into how to use this telnet connection for automated verification.