[time-nuts] Z38XX

Azelio Boriani azelio.boriani at screen.it
Wed Apr 24 07:03:06 EDT 2013


I have a weared out 24LC256: I have made some experiments and noted that
the bits turned to 1, slowly revert back to 0. Writing and immediately
reading back to check can show no errors but reading again after some
seconds reveals the errors.


On Wed, Apr 24, 2013 at 9:43 AM, Volker Esper <ailer2 at t-online.de> wrote:

>
> How do I recognize a wear out? Does the receiver send an error message
> every time I try to change the NVRAM or do I have to ask it?
> Volker
>
> Am 24.04.2013 00:08, schrieb Mark C. Stephens:
>
>> Thanks Ulrich, Much Appreciated, prefer to use your software.
>>
>> Thanks Again,
>> mark
>>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces@**febo.com<time-nuts-bounces at febo.com>]
>> On Behalf Of Ulrich Bangert
>> Sent: Tuesday, 23 April 2013 5:36 PM
>> To: Time nuts
>> Subject: [time-nuts] Z38XX
>>
>> Gentlemen,
>>
>> due to the discussion that evolved concerning Z38XX i looked up the
>> sources and found that indeed every time the current time is read using a
>>
>> :PTIM:TCOD?
>>
>> a
>>
>> :PTIM:TCOD:FORM F2
>>
>> is sent in advance to make the receiver answer in the format that Z38XX
>> needs. I have not been aware that this could lead to NVRAM wear out but
>> have been thinking this simply sets the format of the next output. I have
>> changed the software so that the FORM F2 command is now only written once
>> after program start. The software can be downloaded from the usual place
>> but I have currently no time to test it.
>>
>> My own experiences with NV memory that can only be written for a limited
>> number of times  (EEPROM on ATMEL processors) indicates that a clever made
>> NV writing routine would first compare the NV contents to what shall be
>> written on a byte by byte base and write only changed bytes.
>>
>> Best regards
>>
>> Ulrich Bangert
>> www.ulrich-bangert.de
>> Ortholzer Weg 1
>> 27243 Gross Ippener
>>
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>>
>
>
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