Email: Password: Remember Me | Create Account (Free)

Back to Subject List

Old thread has been locked -- no new posts accepted in this thread
Richard Erlacher
02/21/12 08:38
Read: 418 times
Denver, Co

#186109 - it's difficult to provide persuasive evidence
Responding to: Erik Malund's previous message
I'd guess that the vast majority of "bug reports" result from the developer's lack of sufficient equipment to put together a convincing case for hardware bug. Most of the "bugs" I've detected in the past decade have simply been the result of inadequate documentation from the manufacturer.

I inquired, for example, about the timings of the UART in the Maxim/Dallas DS89C4x0 series, and, after two and a half years, have not gotten any information back. They couldn't provide any useable information about the flag timing, interrupt timing, etc. Their blanket statement that it works like the standard UART falls apart in the fact that the chip is a one-clocker. It's not a serious problem, at least for me, since I seldom use the UARTs, but nevertheless, it's a problem for someone who wants to know what he's doing. The UART timings certainly can produce "buggy operation" if one doesn't have a clue about these features.

Nevertheless, if you have "pictures" taken with a logic analyzer and oscilloscope, that show an occurrence clearly in violation of published data, you'll probably get some action, though not necessarily what you want, from the manufacturer.

You can produce good, functioning circuitry and firmware with very little test equipment, but there's no guarantee that you will. You certainly can't verify it. Since many of the people posting on 8052.COM lack logic analyzer, oscillsocope, etc, and some even lack a multimeter, it's hard to imagine that they can provide convincing evidence of a bug. Further, if their code is written in HLL, it's far too easy to blame the "problem" on the compiler or libraries.


List of 34 messages in thread
So what does "high volume" mean to you?      Andy Neil      02/19/12 02:42      
   1 million sales      JecksonS Ben      02/19/12 04:46      
   Depends too much on product and product value      Per Westermark      02/19/12 08:53      
   In the cellphone market? Millions.      Christoph Franck      02/19/12 10:07      
      50k?      Rob Klein      02/19/12 16:18      
         Report a bug and see what happens:      Christoph Franck      02/20/12 06:02      
            No help from SiLab technical support      Bert Van Den Berg      02/20/12 12:30      
               unusual or changed or ....      Erik Malund      02/20/12 12:47      
                  Response from local distributor      Bert Van Den Berg      02/20/12 17:56      
            Shouldn't be the case?      Andy Neil      02/20/12 16:22      
               It's probably a risk vs. reward thing.      Christoph Franck      02/21/12 00:59      
                  but, at least        Erik Malund      02/21/12 07:33      
               Alas so huge amounts of false bug reports to support      Per Westermark      02/21/12 03:22      
                  a valid point      Erik Malund      02/21/12 07:38      
                     Not so sure about bigger companies have better skills      Per Westermark      02/21/12 08:32      
                     it's difficult to provide persuasive evidence      Richard Erlacher      02/21/12 08:38      
                        to prove a chip defect        Erik Malund      02/21/12 08:54      
                           I'm guessing this happens because of slow response times ...      Richard Erlacher      02/26/12 20:32      
                           I see it from a different angle ...      Richard Erlacher      02/26/12 20:32      
                  RE: huge amounts of false bug reports      Andy Neil      02/21/12 15:54      
                     That's why bug reports must be accompanied by evidence      Richard Erlacher      02/26/12 20:37      
               I have twice had one such case      Erik Malund      02/21/12 07:26      
         that value      JecksonS Ben      02/22/12 01:12      
            Does anyone buy components at a "local" store.      Andy Neil      02/22/12 17:00      
               Not anymore ...      Rob Klein      02/23/12 05:29      
               seems to be the case in Farawayistan      Erik Malund      02/23/12 06:56      
                  Early silicon      Per Westermark      02/23/12 07:10      
                     even better      Erik Malund      02/23/12 07:55      
                  It was common in the U.S. to buy small quantities locally      Richard Erlacher      02/26/12 20:46      
               On-line      JecksonS Ben      02/26/12 23:38      
   High volume usually means low margin.      Christoph Franck      02/20/12 06:07      
      High volume means high profit      JecksonS Ben      02/24/12 01:01      
   Ask this question the mcu manufacturers.      Jan Waclawek      02/20/12 14:08      
   In terms of products:      Christoph Franck      02/21/12 04:28      

Back to Subject List