AT88SC6416CRF-MR1 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88SC6416CRF-MR1

CryptoRF® Specification

Atmel Corporation 

Appendix R. 88RF PICC Backward Compatibility

88RF PICCs can be configured to operate in the majority of applications developed for 88SC PICCs. Customers

migrating from 88SC devices to 88RF devices may be required to change their application software if they are using

functions identified in this appendix.

R.1.

Error Handling

When a command packet containing errors is received by an 88SC or 88RF PICC, the status code returned in the

NACK response is the first error detected by the logic. The status code returned by 88RF PICCs may be different from

the status code returned by 88SC PICCs.

R.2.

Security Options

The Access Register (AR) and Device Configuration Register (DCR) definitions for 88RF PICCs are not exactly the

same as the 88SC PICC definitions. Some RFU bits have been assigned new functionality. The changes which impact

backward compatibility are summarized here.

R.2.1. Program Only Mode

88RF PICCs allows the Program Only Mode in User Zone 1 only. Program Only Mode is not allowed in User Zones 0,

2, or 3. The Access Register PGO bit is RFU for registers AR0, AR2, and AR3.

R.2.2. Write Lock Mode

88RF PICCs do not support Write Lock Mode. The Access Register WLM bit is RFU.

R.2.3. Unlimited Checksum Read

88RF PICCs do not support Unlimited Checksum Reads. The Device Configuration Register UCR bit is RFU.

R.2.4. Extended Trials Allowed

The CryptoRF Device Configuration Register ETA bit is RFU. The 88RF PICC attempts limit is always 15; it is no

longer configurable. [88SC PICCs allowed 4 or 8 attempts.]

R.2.5. Dual Access Mode

88RF PICCs do not support Dual Access Mode. The CryptoRF Access Register bits which selected Dual Access Mode

have been assigned to another communication security mode.

R.3.

Attempt Counters

Both the Password Attempts Counters (PACs) and Authentication Attempts Counters (AACs) have been redesigned to

allow 15 failed attempts before the Password or Key is locked. The coding of the PAC and AAC registers has been

changed to support the increased attempts counts.

R.4.

Checksums

The requirement to supply a valid checksum when performing a write in Encryption Communication mode and

Authentication Communication mode is strictly enforced by 88RF PICCs. [88SC PICCs require a valid checksum if the

Access Register security mode bits for the current User Zone require that Encryption Communication mode or

Authentication Communication mode be active to write the User Zone. If Authentication or Encryption is not required,

then 88SC PICCs do not always require that a valid checksum be supplied to perform a write.]

148 AT88SC0808/1616/3216/6416CRF, AT88RF04C

5276C–RFID–3/09

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