Gemalto Prox-DU, Справочное руководство

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Reference Manual
Prox–DU & Prox–SU
www.gemalto.com
DOC118569D Public Use Page 141/145
the card will not allow memory access using Key B.
Access Bits
The access conditions for the specified operations are defined for each block. The sector
trailer and the data blocks are controlled independently.
In sectors consisting of four blocks, the access conditions for each individual block are
programmable.
In sectors consisting of sixteen blocks, the 15 data blocks are arranged into three groups of
five blocks, with the access conditions are defined independently for each group.
Refer to “Access to Data Blocks” Table and “Access to Sector Trailer” Table for the values
of these bytes.
The access bits determine the access rights to the memory using the authentication keys A
and B. The access conditions may be altered, provided that the relevant key is known and
the actual access condition allows this operation.
The following table describes only access bits in the non-inverted mode (although they can
be stored in both non-inverted and inverted mode):
Access Bits Valid Commands Block Description
C1
0
C2
0
C3
0
Read, Write, Increment,
Decrement, Transfer, Restore
0 Data Block
C1
1
C2
1
C3
1
Read, Write, Increment,
Decrement, Transfer, Restore
1 Data Block
C1
2
C2
2
C3
2
Read, Write, Increment,
Decrement, Transfer, Restore
2 Data Block
C1
3
C2
3
C3
3
Read, Write 3 Sector Trailer
Table 19 – Access Bits and the Valid Commands
The internal logic of the MIFARE
®
circuit ensures that the commands are executed only
after an authentication using either Key A or Key B has been successfully performed.
Note: the “Increment”, “Decrement”, “Transfer”, “Restore” commands are not available using
the PC/SC V2 MIFARE
®
commands.
Data Block Access Conditions
The access bits for the data blocks are specified as Never, Key A or Key B.
The setting of the relevant access bits defines the application and the resulting applicable
commands. Key A | B
indicates that access is possible only after an authentication using
Key A or Key B of this sector.
The access condition for every block is dependant on the sector number as explained in the
following table:
Sector Block Description
N
(0 – 31)
0 C3
0
- C2
0
- C1
0
1 C3
1
- C2
1
- C1
1
2 C3
2
- C2
2
- C1
2