| ??? 11/02/06 15:03 Read: times |
#127265 - blah blah Responding to: ???'s previous message |
Erik Malund said:
1) not EEprom, but flash What's the difference (failure-wise)? Erik Malund said:
I remeber parts from that age listed as having a guaranteed 'memory retention' of only 5 years. Yeah, sure, and this one might have been a particular crap, why not, they learned how to make flash then. My point was the same you make later: flash (nor EPROM and under some circumstances even the IC itself... ever heard of electromigration?) is not forever... And, again and again and again, it depends on circumstances how long do they really last and how long is forever... :-) (it seems that for the modern scap, TV and phone and similar, you get in the shops now, forever is somewhere in the range of one-two years :-( ) Erik Malund said:
Thus an automatic replacement/reprogramming system should be implemented, not "when the checksum fails we will fix it" Not a bad policy; however, as I said somwhere above, CRC costs little and might save one's softer part of body later... :-))) It's just putting in extra ceramics to each and every chip - they cost little so why not having an extra margin for a few cents? I'd bet you can come up with tons of other similar examples. JW |
