LRI64-A1S STMICROELECTRONICS [STMicroelectronics], LRI64-A1S Datasheet - Page 13

• Manufacturer Part Number: LRI64-A1S
• Description: Memory TAG IC, 64-bit Unique ID with WORM User Area 13.56MHz, ISO15693 and ISO18000-3 Mode 1 Compliant
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

LRI64 PROTOCOL DESCRIPTION
The Transmission protocol defines the mecha-
nism to exchange instructions and data between
the VCD and the LRI64, in each direction. Based
on “VCD talks first”, the LRI64 does not start trans-
mitting unless it has received and properly decod-
ed an instruction sent by the VCD.
The protocol is based on an exchange of:
–
–
Each Request and each Response are contained
in a Frame. The frame delimiters (SOF, EOF) are
described in the previous paragraphs.
Each Request
–
–
–
–
–
–
–
Figure 17. VCD Request Frame Format
Figure 18. LRI64 Response Frame Format
Figure 19. LRI64 Protocol Timing
a Request from the VCD to the LRI64
a Response from the LRI64 to the VCD
Request SOF
Request Flags
Command Code
Parameters (depending on the Command)
Application Data
2-byte CRC
Request EOF
Timing
VICC
VCD
(Figure
(Figure
(Figure
(Figure
(Table 3.
Request Frame
17.) consists of:
Request
SOF
16.)
8.)
9.)
Response
SOF
to
Table
Request
Flags
t1
Response
Flags
5.)
Response Frame
Command
Code
Parameters
Parameters
t2
Each Response
–
–
–
–
–
–
The number of bits transmitted in a frame is a mul-
tiple of eight, and thus always an integer number
of bytes.
Single-byte fields are transmitted Least Significant
Bit first.
Multiple-byte fields are transmitted Least Signifi-
cant Byte first, with each byte transmitted Least
Significant Bit first.
The setting of the flags indicates the presence of
any optional fields. When the flag is set, 1, the field
is present. When the flag is reset, 0, the field is ab-
sent.
Data
Request Frame
Response SOF
Response Flags
Parameters (depending on the Command)
Application Data
2-byte CRC
Response EOF
Data
2-Byte
CRC
2-Byte
CRC
(Figure
(Figure
t1
Response
(Figure
(Figure
EOF
(Table
Response Frame
Request
16.)
18.) consists of:
EOF
12.)
13.)
6.)
t2
AI06830B
AI09727
AI09728
LRI64
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