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It appears that in a few of our products we
have had bits in the program flash memory (DSP56F805) revert to their
unprogrammed state after only a few days. Has anyone else seen
this?
Doug Holub
Irving, Texas
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losing flash memory in the DSP56F805FV80
Started by ●March 24, 2005
Reply by ●March 24, 20052005-03-24
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It looks like that register only controls the erase times, but maybe they're not being erased long enough before we program them. Do we need to erase the chips before we program them? Can we assume when they are factory fresh that they are fully erased? Doug ----- Original Message ----- From: John Breitenbach To: Douglas Holub Sent: Thursday, March 24, 2005 4:42 PM Subject: Re: [motoroladsp] losing flash memory in the DSP56F805FV80 Doug, Check the flash clock divisor register. If the divisor is not set properly, then you won't assert the programming voltage to the flash cells for long enough and your product will lose its memory. Best regards, - John Breitenbach - Atlantex Corp. - (201) 664-3445 - "Quote me as saying I was misquoted" - Groucho Marx ----- Original Message ----- From: Douglas Holub To: Sent: Thursday, March 24, 2005 3:19 PM Subject: [motoroladsp] losing flash memory in the DSP56F805FV80 It appears that in a few of our products we have had bits in the program flash memory (DSP56F805) revert to their unprogrammed state after only a few days. Has anyone else seen this? Doug Holub Irving, Texas a.. To |
Reply by ●March 25, 20052005-03-25
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Hi, I had a DSP56F807 which sometimes showed verify errors after programming, but most times the verify after the programming was ok. I did not see that programmed bits changed after some time, because I did not special tests for that. Kind regards, Wim de Haan Exendis B.V. W.J. de Haan P.O.box 56, 6710 BB Ede Keesomstraat 4, 6716 AB Ede The Netherlands. -----Oorspronkelijk bericht----- Van: Douglas Holub [mailto:] Verzonden: donderdag 24 maart 2005 21:20 Aan: Onderwerp: [motoroladsp] losing flash memory in the DSP56F805FV80 It appears that in a few of our products we have had bits in the program flash memory (DSP56F805) revert to their unprogrammed state after only a few days. Has anyone else seen this? Doug Holub Irving, Texas |
