Re: Turn off laser printer with power strip?

Yes, that is a lot of write cycles IF a program does not update its
configuration data in real time. For example, an EEPROM in an ink jet
cartridge might be written to because cartridge lasts only a short time
and then is disposed. Printer cannot store its real time configuration
because it would easily exceed write cycle number. Older EEPROM
technology is limited to 10,000 cycles.

Limited write cycles is a reason we (engineers) designed EEPROM
'shadowed' with volatile RAM, or updated very infrequently, or simply
used only for program storage. But again, EEPROM has limited write
cycles which is why that data*** lists write cycle number - up top
where critical information is summarized. That write cycle limitation
is a critical design parameter that I suspect other posters here never
knew.

Other parameters are beyond the scope of this discussion including
write time. Two EEPROM technologies are NAND and NOR. They have
different timing (read and write), storage density, costs, and other
parameters. These differences are why both types may exist in cell
phones. As that HP technical note cited by John Smith says, real time
data is written to NVRAM - not EEPROM as John Smith assumed. EEPROM,
as I noted in earlier posts, would simply fail prematurely. All this
to remind which one here posted with accurate knowledge and experience
- which so many failed to read with care AND failed to learn before
drawing conclusions.

Meanwhile, one does not reset EPROMs or EEPROMs. One may reload an
EEPROM with new data. A technician may confuse 'resetting with a
program reload. But reset or initializing (as is also performed to
computer motherboards) is (for example) 'removing battery backup from
static memory'. Battery backup converts static memory into NVRAM.
Other technologies such as Iron based memory exist. But again, EEPROMs
are not reset. EEPROMs would be reprogrammed.

This write limitation and why real time configuration is not stored
in EEPROM should have been obvious with basic electronics knowledge.
This EPROM or EEPROM question was because one with minimal electronics
knowledge should have known all this.

Tony wrote:
You might be interested in this extract from a Samsung data *** - see
http://www.samsung.com/Products/Semiconductor/SystemLSI/EEPROM/S524AB0XB1/S524AB0XB1.htm
and download the pdf.

"S524A40X10/40X20/40X40 serial EEPROM
· 1,000,000 erase/write cycles"

That's a lot of write cycles.
This was the first specification I found for an EEPROM, it may or may not be
typical.
Tony

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