lri2k STMicroelectronics, lri2k Datasheet - Page 29

• Manufacturer Part Number: lri2k
• Description: 13.56 Mhz, 2048-bit Eeprom Tag Ic With 64-bit Uid And Kill Code, Iso 15693 And Iso 18000-3 Mode 1 Compliant
• Manufacturer: STMicroelectronics

LRI2K
9
9.1
Data storage format identifier (DSFID)
The Data storage format identifier indicates how the data is structured in the LRI2K memory.
The logical organization of data can be known instantly using the DSFID.
It can be programmed and locked using the Write DSFID and Lock DSFID commands,
respectively. It is coded on one byte.
CRC
The CRC used in the LRI2K is calculated as per the definition in ISO/IEC 13239.
The initial register contents are all ones: "FFFF".
The two-byte CRC is appended to each request and response, within each frame, before
the EOF. The CRC is calculated on all the bytes between the SOF and the CRC field.
Upon reception of a request from the VCD, the LRI2K verifies that the CRC value is valid. If
it is invalid, the LRI2K discards the frame and does not answer to the VCD.
Upon reception of a response from the LRI2K, it is recommended that the VCD verifies
whether the CRC value is valid. If it is invalid, actions to be performed are left to the
discretion of the VCD designers.
The CRC is transmitted least significant byte first.
Each byte is transmitted least significant bit first.
Table 6.
LSBit
CRC transmission rules
CRC 16 (8bits)
LSByte
MSBit LSBit
Data storage format identifier (DSFID)
CRC 16 (8 bits)
MSByte
MSBit
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