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software for self-driving
cd2012   10/31/2013 7:45:46 AM
On a tangent, seeing how difficult it is to write flawless software for a ECU, is there any hope of writing good software for a self-driving car, which is an immensely more difficult problem?


vasanth kumar d
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Re: Is all hope lost?
vasanth kumar d   10/31/2013 1:26:12 AM
Is all hope lost?


Infact, the right question must be "Do we really need to hope anything?".

Because, even if we could write a perfect firmware that has zero bugs and failures that results in a perfect car, it ceases to be perfect until some other driver lost control of his vehicle and hits us. If so, the best answer, according to me, is to not hope perfection. The only thing we could do is to try writing better firmware that would result in better systems than that was previously.

rick merritt
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Re: Is all hope lost?
rick merritt   10/31/2013 12:25:23 AM
@Larry: Agreed

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Re: Is all hope lost?
LarryM99   10/30/2013 8:12:10 PM
It is possible to reduce errors to effectively zero, but it is very hard. Complex will always be less reliable than simple, unless that complexity is focused on reliability (for example, overlapped and crosschecked operation of independent systems). The system (hardware and software) has to be independently verified, since developers have blind spots around their own work. The real issue is that it can't be rushed. Making reliability trump schedule would avoid many problems of this type, but especially recently that is a hard case for engineers to make to management.

Frank Eory
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Is all hope lost?
Frank Eory   10/30/2013 6:48:34 PM
So to summarize, he seems to be saying:

1. Complex software always has bugs, even latent ones that might rarely if ever show up.

2. No matter how imaginative the team is, they will never be able to think of all those bugs. Some bugs and their consequences will simply never occur to the team members.

3. Safety critical systems should follow standards, but even if they do, random events can still activate latent software bugs and take out the fail safe systems designed to protect against those latent bugs.

Is all hope lost?

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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