BMW On-Board Computer Bedienungshandbuch PDF herunterladen (Seite 21)

*type of non-volatile memory used in computers and other electronic devices to store small amounts of

data that must be saved when power is removed, e.g., calibration tables or device configuration.

*Failure modes…

There are two limitations of stored information; endurance, and data retention.

During rewrites, the gate oxide in the floating-gate transistors gradually accumulates trapped electrons.

The electric field of the trapped electrons adds to the electrons in the floating gate, lowering the window

between threshold voltages for zeros vs ones. After sufficient number of rewrite cycles, the difference

becomes too small to be recognizable, the cell is stuck in programmed state, and endurance failure occurs.

The manufacturers usually specify minimal number of rewrites being 106 or more.

During storage, the electrons injected into the floating gate may drift through the insulator, especially at

increased temperature, and cause charge loss, reverting the cell into erased state. The manufacturers

usually guarantee data retention of 10 years or more.

thats all i know for now…cheers

posted on July 12th, 2008 at 10:29 am

87 On July 12th, 2008, ukfrog said: 87.

woooooouuuuuuaaaaaaa!

Sach,

That is very informative, thank you for posting this.

Can you clarify one or two things please?

1) Does the charge loss effect the PROM cell, (is it only the cell that has loss of charge)?

2) Is there a fix for it, to clear the accumulated electrons. (Discharge in some form or an other?)

posted on July 12th, 2008 at 1:15 pm

88 On July 15th, 2008, sach767 said: 88.

its pretty simple, reset the OBC… follow step #21 and it works fine.

cheers…

posted on July 15th, 2008 at 7:12 am

89 On July 20th, 2008, matxng said:

89.

does it work for 1993 318is? (these obc secrets) coz when i press the 1000 and the 100 buttons it appear

“FUNKTION –” i know its a german word of function but i dont know technically what it stands for…

nor what does it do… thanks

posted on July 20th, 2008 at 10:58 pm

90 On July 21st, 2008, Tony Sticks said:

90.

@matxng: Yes. My car is 1993 318is and it’s working fine. After you see the FUNKTION — , you can

use the 10 & 1 buttons to insert the test code that you need then press Set to run that function.

Also, if you need to change the language, you can do that by following the “Setting the Country Code”

section instructions.

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