LRI64 datasheet(12/38 Pages) STMICROELECTRONICS

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LRI64

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SPECIAL FIELDS

Unique Identifier (UID)

Members of the LRI64 family are uniquely identi-

fied by a 64-bit Unique Identifier (UID). This is

used for addressing each LRI64 device uniquely

and individually, during the anti-collision loop and

for one-to-one exchange between a VCD and an

LRI64.

The UID complies with ISO/IEC 15963 and ISO/

IEC 7816-6. It is a read-only code, and comprises

(as summarized in Figure 14.):

–

8-bit prefix, the most significant bits, set at E0h

–

8-bit IC Manufacturer code (ISO/IEC 7816-6/

AM1), set at 02h (for STMicroelectronics)

–

48-bit Unique Serial Number

Figure 14. UID Format

Figure 15. Decision Tree for AFI

Application Family Identifier (AFI)

The Application Family Identifier (AFI) indicates

the type of application targeted by the VCD, and is

used to select only those LRI64 devices meeting

the required application criteria (as summarized in

Figure 15.). The value is programmed by the

LRI64 issuer in the AFI register. Once pro-

grammed, it cannot be modified.

The most significant nibble of the AFI is used to in-

dicate one specific application, or all families. The

least significant nibble of the AFI is used to code

one specific sub-families, or all sub-families. Sub-

family codes, other than 0, are proprietary (as de-

scribed in ISO 15693 and ISO 18000-3 Mode 1

documentation).

Data Storage Format Identifier (DSFID)

The Data Storage Format Identifier (DSFID) indi-

cates how the data is structured in the LRI64

memory. It is coded on one byte. It allows for quick

and brief knowledge on the logical organization of

the data. It is programmed by the LRI64 issuer in

the DSFID register. Once programmed, it cannot

be modified.

Cyclic Redundancy Code (CRC)

The Cyclic Redundancy Code (CRC) is calculated

as defined in ISO/IEC 13239, starting from an ini-

tial register content of all ones: FFFFh.

The 2-byte CRC is appended to each Request and

each Response, within each frame, before the

EOF. The CRC is calculated on all the bytes after

the SOF, up to the CRC field.

Upon reception of a Request from the VCD, the

LRI64 verifies that the CRC value is valid. If it is in-

valid, it discards the frame, and does not answer

the VCD.

Upon reception of a Response from the LRI64, it is

recommended that the VCD verify that the CRC

value is valid. If it is invalid, the actions that need

to be performed are up to the VCD designer.

The CRC is transmitted Least Significant Byte first.

Each byte is transmitted Least Significant Bit first,

as shown in Figure 16.).

Figure 16. CRC Format

AI09725

E0h

Unique Serial Number

02h

Most significant bits

Least significant bits

AI06679B

Inventory Request

Received

No Answer

Yes

AFI value

= 0 ?

Yes

AFI Flag

Set ?

Yes

Answer given by the VICC

to the Inventory Request

AFI value

= Internal

value ?

AI09726

Most Significant Byte

Least Significant Byte

l.s.bit

m.s.bit

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