LRI512 Просмотр технического описания (PDF) - STMicroelectronics
Номер в каталоге
Компоненты Описание
производитель
LRI512
STMicroelectronics
LRI512 Datasheet PDF : 54 Pages
| |||
LRI512
UNIQUE IDENTIFIER (UID)
The LRI512s are uniquely identified by a 64-bit
Unique Identifier (UID). This UID complies with
ISO/IEC 15963 and ISO/IEC 7816-6. The UID is a
read only code, and comprises:
– The 8 MSB is E0h
– The IC Manufacturer code of ST 02h, on 8 bits
(ISO/IEC 7816-6/AM1)
– A Unique Serial Number on 48 bits.
The UID is used for addressing each LRI512
uniquely and individually, during the anti-collision
loop and for one-to-one exchange between a VCD
and a LRI512.
Table 5. UID Format
MSB
LSB
63
56 55
48 47
0
E0h
02h
Unique Serial Number
APPLICATION FAMILY IDENTIFIER (AFI)
The AFI (Application Family Identifier) describes
the type of application targeted by the VCD, and is
used to extract from all the LRI512s present only
the LRI512s meeting the required application cri-
teria.
It is programmed by the LRI512 issuer in the AFI
register. Once programmed and Locked, it cannot
be modified.
The most significant nibble of AFI is used to code
one specific or all application families.
The least significant nibble of AFI is used to code
one specific or all application sub-families. Sub-
family codes, other than 0, are proprietary.
(See ISO 15693-3 documentation)
Figure 28. LRI512 Decision Tree for AFI
Inventory Request
Received
No
AFI Flag
Set ?
Yes
AFI value No
=0?
Yes
AFI value No
= Internal
value ?
Yes
Answer given by the LRI512
to the Inventory Request
No Answer
AI06679
CRC
The CRC used in the LRI512 is calculated as per
the definition in ISO/IEC 13239.
The initial register content is 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
LRI512 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 LRI512, it
is recommended that the VCD verify that the CRC
value is valid. If it is invalid, actions to be per-
formed are left to the responsibility of the VCD de-
signer.
The CRC is transmitted Least Significant Byte first.
Each byte is transmitted Least Significant Bit first.
Table 6. CRC Transmission Rules
LSByte
MSByte
LSBit
MSBit LSBit
MSBit
CRC 16 (8bits)
CRC 16 (8 bits)
15/54
Share Link: