Gemalto Prox–DU - Page 142

Reference Manual
Prox–DU & Prox–SU
www.gemalto.com
DOC118569D Public Use Page 142/145
3 C3
3
- C2
3
- C1
3
N
(32 – 39)
0
C3
0
- C2
0
- C1
0
1
2
3
4
5
C3
1
- C2
1
- C1
1
6
7
8
9
10
C3
2
- C2
2
- C1
2
11
12
13
14
15
C3
3
- C2
3
- C1
3
Table 20 – Access Condition for Data Blocks
The MIFARE
®
system regards authentication Key B as the primary key for access control to
the data memory. Operations which are performed with authentication Key A can also be
done with authentication Key B. But, only some sensitive operations can be performed with
Key B.
The previous Table “Access Bits and the Valid Commands” shows the types of access
conditions associated with their bit values and the access granted by authentication with
Key A and Key B.
Access Bits
Access Condition
Data Block or Superior Block Group
b = 0, 1, 2
C1
b
C2
b
C3
b
Read Write Increment
Decremen
t/
Transfer/
Restore
Comments
0 0 0 Key A | B
1
Key A | B
1
Key A | B
1
Key A | B
1
A or B All function
memory block
0 0 1 Key A | B
1
Never Never Key A | B
1
A or B Read
/Subtract Value
block
0 1 0 Key A | B
1
Never Never Never
A or B Read only
memor
y
block
0 1 1 Key B
1
Key B
1
Never Never
B Read /Write
memor
y
block