Bity dostępu do pamięci EEPROM w NFC MIFARE
Poniższe narzędzie służy do obliczenia wartości bitów stanu dostępu do bloków w sektorach pamięci EEPROM stosowanych kartach i znacznikach zbliżeniowych NFC MIFARE. Za jego pomocą można również określić warunki dostępu do nagłówka sektora (Sector Trailer).
Pamiętaj! Nierozważne ustawienie stanów dostępu (Access Condition) może trwale zablokować możliwość jego ponownego zapisu, pomimo znajomości obu kluczy dostępu.
Access Bits:
Access Bits |
Key A | Access Condition | Key B | ||||
Read | Write | Read | Write | Read | Write | ||
000 | never | A | A | never | A | A | |
010 | never | never | A | never | A | never | |
100 | never | B | A | B | never | never | B | |
110 | never | never | A | B | never | never | never | |
001 | never | A | A | A | A | A | |
011 | never | B | A | B | B | never | B | |
101 | never | never | A | B | B | never | never | |
111 | never | never | A | B | never | never | never |
Block 0 | Read | Write | Inc | Dec | |
000 | A | B | A | B | A | B | A | B | |
010 | A | B | never | never | never | |
100 | A | B | B | never | never | |
110 | A | B | B | B | A | B | |
001 | A | B | never | never | A | B | |
011 | B | B | never | never | |
101 | B | never | never | never | |
111 | never | never | never | never |
Block 1 | Read | Write | Inc | Dec | |
000 | A | B | A | B | A | B | A | B | |
010 | A | B | never | never | never | |
100 | A | B | B | never | never | |
110 | A | B | B | B | A | B | |
001 | A | B | never | never | A | B | |
011 | B | B | never | never | |
101 | B | never | never | never | |
111 | never | never | never | never |
Block 2 | Read | Write | Inc | Dec | |
000 | A | B | A | B | A | B | A | B | |
010 | A | B | never | never | never | |
100 | A | B | B | never | never | |
110 | A | B | B | B | A | B | |
001 | A | B | never | never | A | B | |
011 | B | B | never | never | |
101 | B | never | never | never | |
111 | never | never | never | never |