Breaking News
Comments
Newest First | Oldest First | Threaded View
Peter Clarke
User Rank
Blogger
Re: Software safety
Peter Clarke   7/2/2013 3:20:09 AM
NO RATINGS
@DrQuine

 

Thanks for chiming in.

 

Your point about software testing not being exhaustive against all possibilities and timings of external events is important.

 

Formal methods were once thought to be the way to "prove" hardware was correct but idea of formally provable hardware lost momentum when it was realized that formally proving sofware-plus-hardware-plus-interrupts was a much less tractable problem.

DrQuine
User Rank
CEO
Re: Software safety
DrQuine   7/1/2013 11:00:47 PM
NO RATINGS
An example of the kind of thing that these standards do is that IEC 61508 requires that the software is fully tested at the function level and that all possible branches and paths are taken through the software. This is an important step in that having a system do unexpected things that were never tested may be possible to avoid. This, however, cannot necessarily ensure that every unexpected external event will result in the correct software "decision" and outcome.

Peter Clarke
User Rank
Blogger
Re: Software safety
Peter Clarke   7/1/2013 8:27:56 AM
NO RATINGS
IEC 61508 is a standard on the functional safety of electrical and electronic systems and specifically includes software.

So if you want to learn what is necessary I suggest you download the standard.

ISO 26262 is an automotive functional safety standard which again sets out methods of risk assement and how risk concatenates through an automotive function chain. Again it explicitly mentions software.

How you test software for safety is an enormous topic and too beg to address here.

I would just point out that these standards also expect users to test the tools they use to help them create software - such as compilers - to make sure they do not introduce problems.

 

MeasurementBlues
User Rank
Blogger
Software safety
MeasurementBlues   7/1/2013 8:18:52 AM
NO RATINGS
What are the main reasons for IEC 61508 and ISO 26262? How does software get tested for safety?

Pho99
User Rank
Rookie
Interesting -- This seems to be the first offering by a silicon OEM in this area
Pho99   7/1/2013 6:28:23 AM
NO RATINGS
Interesting -- This seems to be the first offering by a silicon OEM in this area



EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Oh, No! My Antique Analog Meter Has Twitched Its Last
Max Maxfield
20 comments
Well, life is certainly full of ups and downs, isn't it? When it comes to the antique analog meters I'm using in a number of my hobby projects, things appeared to be going swimmingly well, ...

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
20 comments
This collection of places from technology history, museums, and modern marvels is a roadmap for an engineering adventure that will take you around the world. Here are just a few spots ...

Glen Chenier

Engineers Solve Analog/Digital Problem, Invent Creative Expletives
Glen Chenier
15 comments
- An analog engineer and a digital engineer join forces, use their respective skills, and pull a few bunnies out of a hat to troubleshoot a system with which they are completely ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
46 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)