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???
01/17/07 00:06
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 		 #130937 - Well ... it seems to me ...
Responding to: ???'s previous message
Once in a while you just can't believe what's happening in front of you and it's comforting to run through a thorough diagnostic.

There are fewer than 255 instructions in the instruction set, and there are only 256 read/write memory locations inside and 64K of them outside. CRC or Checksumming should provide adequate confidence in the program store, and writing every possible combination of bits to the internal RAM, and, later, to the external RAM or internal XRAM if there is any, should provide some confidence.

Making sure that the SFRs behave as they should, and verifying that the flags do what's expected should be on the list, and then there's the I/O ...

When you're hot on the trail of a really elusive problem, don't you guys want to verify that everything's working?

Do you just plug in a part and ship it?

What do you guys do as "receiving inspection" when you buy parts?

RE


List of 53 messages in thread
TopicAuthorDate
805x system self-test            01/01/70 00:00      
   erk            01/01/70 00:00      
      Well ... it seems to me ...            01/01/70 00:00      
         Not That            01/01/70 00:00      
            Clearly if the CPU is knackered            01/01/70 00:00      
               If you have a new lot of parts ...            01/01/70 00:00      
                  depending on application...            01/01/70 00:00      
                     let me reframe the question ...            01/01/70 00:00      
                        do you want to do the manufacturer's job?            01/01/70 00:00      
                           don't get me wrong            01/01/70 00:00      
                           No, it's not his job ...            01/01/70 00:00      
                  OF COURSE you do            01/01/70 00:00      
                     I don't know which disty's you do biz with ...            01/01/70 00:00      
                        why? what? when? how?            01/01/70 00:00      
                           Where you sit determines what you see.            01/01/70 00:00      
                              not at all            01/01/70 00:00      
                              RC reset            01/01/70 00:00      
                                 on testing            01/01/70 00:00      
                                    re smoke - I just realize            01/01/70 00:00      
                                       5 Volts can produce smoke            01/01/70 00:00      
                                    Why focus on smoke? Have you missed the point?            01/01/70 00:00      
                                 nope ... not that simple            01/01/70 00:00      
                                    but it sounds exactly so...            01/01/70 00:00      
                                       I've tried a MAX1232 ... is that good enough?            01/01/70 00:00      
                                          pushbutton reset            01/01/70 00:00      
                                             pushbutton            01/01/70 00:00      
                                                I don't understand            01/01/70 00:00      
                                                   NO!            01/01/70 00:00      
                                                      some options            01/01/70 00:00      
                                                         That' not exactly the case ...            01/01/70 00:00      
                                                            weird parts            01/01/70 00:00      
                                                               Too bad I didn\'t know about your interest earlier            01/01/70 00:00      
                                                                  your test subjects.... :-)            01/01/70 00:00      
                                                                     under other circumstances ...            01/01/70 00:00      
                           Jan, I think you missed the point            01/01/70 00:00      
                        OH            01/01/70 00:00      
                           Digikey and Mouser aren't "normal" disty's            01/01/70 00:00      
                              You have a very low opinion of distributors, is th            01/01/70 00:00      
                                 Yes I do ...            01/01/70 00:00      
                                    nope            01/01/70 00:00      
               If you have a new lot of parts ...            01/01/70 00:00      
   Your test program            01/01/70 00:00      
      waitaminute ... I didn't say I'd written it ...            01/01/70 00:00      
         Well...            01/01/70 00:00      
            never used a '320.            01/01/70 00:00      
               So...            01/01/70 00:00      
                  I\'ve built 805x stuff since the \'70\'s ...            01/01/70 00:00      
            aackk! it double-posted again            01/01/70 00:00      
   a real example            01/01/70 00:00      
      Testing 8051s            01/01/70 00:00      
         I'm just out to find stuff that's "broken"            01/01/70 00:00      
         how did you come to that figure?            01/01/70 00:00      
            Fault coverage figure            01/01/70 00:00      

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