[time-nuts] Z38XX

Bob Camp lists at rtty.us
Tue Apr 23 07:14:06 EDT 2013


Hi

My experience has been that if you write the *same* setup to NVRAM on a 53131 once every few minutes, you wear out the memory while they are still in warranty….

Bob

On Apr 23, 2013, at 3:36 AM, Ulrich Bangert <df6jb at ulrich-bangert.de> wrote:

> 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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