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???
04/18/06 18:21
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 		 #114474 - The issue is not "can you find out it is
Responding to: ???'s previous message
Are you pointing out the flash once corrupt (due to causes out of the control of the manufacturer) can not be detected by the part, that is, there is not function performed at RESET that validates the FLASH content using checksum or alternative technique?

The issue is not "can you find out it is bad" the issue is that it goes bad.

None of the flash based chips (Philips, SILabs) I use
a) lose their memory.
b) has a detection mechanism for that.

To protect flash some measures (e.g. proper supervisory function - whether on of off chip) must be taken, but the statement re the Dallas chip is "there's no way to ensure" which, for the aforementioned chips there is.

Erik

List of 41 messages in thread
TopicAuthorDate
DS89C420 Bootloader issues            01/01/70 00:00      
   Well, check the app note.            01/01/70 00:00      
      doesn't run also with 24Mhz            01/01/70 00:00      
         Well, I don't know what to say ...            01/01/70 00:00      
            Errata for some series            01/01/70 00:00      
               Well ... let's wait a while            01/01/70 00:00      
                  I've got a rush job in front of me            01/01/70 00:00      
               B5 - Bootloader            01/01/70 00:00      
                  Have you tried ...            01/01/70 00:00      
                     Some speeds probably won't work            01/01/70 00:00      
                        Loader lite trial            01/01/70 00:00      
                  Symptoms            01/01/70 00:00      
   Loader            01/01/70 00:00      
   lock bits            01/01/70 00:00      
      I doubt it            01/01/70 00:00      
         That's what "they" say ...            01/01/70 00:00      
            naah            01/01/70 00:00      
               Smile when you say that ...            01/01/70 00:00      
      Lock Bits            01/01/70 00:00      
         trust but verify ...            01/01/70 00:00      
   It might be a different issue            01/01/70 00:00      
      Any needed?            01/01/70 00:00      
         perhaps some ...            01/01/70 00:00      
            The issue is not "can you find out it is            01/01/70 00:00      
               Not necessarily ...            01/01/70 00:00      
                  How'd you do that?            01/01/70 00:00      
                     Well i cheated ...            01/01/70 00:00      
                        Gee ... I learn new things every day.            01/01/70 00:00      
      It might be a different issue            01/01/70 00:00      
         the real problem            01/01/70 00:00      
            I get \'em as samples            01/01/70 00:00      
               Small volume part acquisition.            01/01/70 00:00      
                  that's seldom a problem for me            01/01/70 00:00      
               apples and oranges            01/01/70 00:00      
                  It's different here            01/01/70 00:00      
                     a mistake            01/01/70 00:00      
                        that rep WAS the local sales office            01/01/70 00:00      
                           I'm confused or you are            01/01/70 00:00      
                              These guys worked for Philips            01/01/70 00:00      
         Not breaking news, but seems relevant            01/01/70 00:00      
         it's still possibly a different issue            01/01/70 00:00      

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