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???
01/17/07 02:28
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 		 #130941 - Not That
Responding to: ???'s previous message
If You Though the CPU was bad, why would you believe it if it said it was good? I once spent a day Tring to fix a RAM problem. The Diags said it was bad replaced the chip, socket, line driver, row driver. Then figured out the CPU was bad.

If I thought the CPU was bad I would change it. I have done CSUM and CRC for Code (very important for ISP). You could do an external RAM test, But you have to be carful how it is done. There is much about it on the web.

I would hit a second board, then a third, check all the timings before I would assume the CPU was not executing Opcodes correctly.

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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