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losing flash memory in the DSP56F805FV80

Started by Douglas Holub March 24, 2005
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



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



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