lri64 STMicroelectronics, lri64 Datasheet - Page 18

• Manufacturer Part Number: lri64
• Description: Memory Tag Ic At 13.56 Mhz, With 64-bit Unique Id And Worm User Area, Iso15693 And Iso18000-3 Mode 1 Compliant
• Manufacturer: STMicroelectronics

Special fields
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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
Once programmed, it cannot be modified.
The most significant nibble of the AFI is used to indicate 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 described in ISO 15693
and ISO 18000-3 Mode 1 documentation).
Data Storage Format Identifier (DSFID)
The Data Storage Format Identifier (DSFID) indicates 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 initial 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 invalid, 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 15. CRC format
Figure
14). The value is programmed by the LRI64 issuer in the AFI register.
Least Significant Byte
l.s.bit
Figure
15).
m.s.bit
Most Significant Byte
l.s.bit
m.s.bit
AI09726
LRI64