Transcript Diapositive 1

Hard protection of words
J.-D. Chatelain
©Contrinex 2013 - JDC
PPT_LF_HardProtection
WARNING
It is not possible to remove a
hard protection!
One memory word
Contrinex
RFID systems
Write protection
Read protection
Hard protection of words
0 1
1
0
Code 00
Without protection: it is possible to
read the word and to overwrite it
Code 02
With a read protection, it is not
possible to read the word but it is
possible to overwrite it
Code 04
With a write protection, it is possible
to read the word but it is not
possible to overwrite it
Code 06
With a read and write protection, it is
neither possible to read the word
nor to overwrite it
00: no protection
02: read protection
04: write protection
06: read and write protection
Result of reading a zone containing protected words.
Words at addresses 61 to 63, with protection code 2, have a hard
protection against reading. The result of reading is always
<FFFF>.
Words at addresses 64 and 65, with protection code 4, has a hard
protection against writing. It is not possible to overwrite this
word, but it is still possible to read it.
Hard protection
End of thisofchapter
words
J.-D. Chatelain
©Contrinex 2013 - JDC
PPT_LF_HardProtection