ib technology
Access Bits Access condition for:
Application
C1 C2 C3 Read
Write
Increment
Decrement,
Transfer,
Restore
0
0
0
0
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
keyA|B
keyA|B
keyA|B
keyB
keyA|B
keyB
keyA|B
never
never
keyB
keyB
never
keyB
never
keyA|B
never
never
never
never
never
keyB
never
keyA|B (Transport setting)
keyA|B (value block)
never
never
never
never
(read/write block)
(read/write block)
(read/write block)
(read/write block)
keyA|B
never
keyA|B (value block)
never (read/write block)
1
Combining the transport (default) access conditions for the data areas and the sector trailer
block, the typical setting is:
Sector Trailer Block
Byte:
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
0xA0 A1 A2 A3 A4 A5 FF 07 80 69 B0 B1 B2 B3 B4 B5
KeyA (6 bytes)
Access Bits
KeyB (6 bytes)
The default access bits (0xFF 07 80 69) define that KeyA must used for all operations and
KeyA can never be read, so in the previous example bytes 0 – 5 (keyA) would always read as
zeros.
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