AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation
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AT88RF04C-MY1G Datasheet PDF : 158 Pages
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J.3.3.
M = 101b Security - Authentication for Write
When M = 101b Authentication is required for Write access to the User Zone. If Authentication is performed with the
key identified in the PK bits of the Key Register, then Read/Write access is granted to the User Zone. Read-Only
access does not require Authentication or Encryption Activation. A checksum is required for write operations.
88RF PICC behavior is identical to 88SC devices when M = 101b.
J.4.
The Password Register [88SC]
The Password Registers are used to select the Key Sets for Authentication or Encryption Communication Security. Any
Key Set can be used with any User Zone by programming the Key Register for the User Zone with the appropriate AK
and POK values. One Key Set can be used with any number of User Zones.
Figure 32. Definition of the User Zone Password Registers on 88SC PICCs.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
AK1 AK0 POK1 POK0 RFU PW2 PW1 PW0
1
1
1
1
1
1
1
1 Default Value
The Authentication Key Set selection bits control the key set assigned to a User Zone for communication security. The
Access Register bits determine the Communication Security mode associated with the AK bits.
Table 84.
AK1
0
0
1
1
Coding of the Authentication Key Set select bits for CryptoRF communication security.
AK0
Authentication Key
Encryption Key
0
Secret Seed G0
Session Key S0
1
Secret Seed G1
Session Key S1
0
Secret Seed G2
Session Key S2
1
Secret Seed G3
Session Key S3
The Program-Only Key Set selection bits control the key set assigned to a User Zone for communication security. The
Access Register bits determine the Communication Security mode associated with the POK bits. The POK bits are only
used in Dual Access Authentication mode.
Table 85. Coding of the Program-Only Key Set select bits for CryptoRF communication security.
POK1
POK0
Authentication Key
0
0
Secret Seed G0
0
1
Secret Seed G1
1
0
Secret Seed G2
1
1
Secret Seed G3
108 AT88SC0808/1616/3216/6416CRF, AT88RF04C
5276C–RFID–3/09
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