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LRIS2K bảng dữ liệu(PDF) 55 Page - STMicroelectronics

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LRIS2K bảng dữ liệu(HTML) 55 Page - STMicroelectronics

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LRIS2K
Inventory
55/102
23
Inventory
When receiving the Inventory request, the LRIS2K runs the anticollision sequence. The
Inventory_flag is set to 1. The meaning of flags 5 to 8 is shown in Table 20: Request_flags 5
to 8 when Bit 3 = 1.
The request contains the:
●
flags
●
Inventory command code (see Table 27: Command codes)
●
AFI if the AFI flag is set
●
mask length
●
mask value
●
CRC
The LRIS2K does not generate any answer in case of error.
The response contains the:
●
flags
●
unique ID
During an Inventory process, if the VCD does not receive an RF LRIS2K response, it waits a
time t3 before sending an EOF to switch to the next slot. t3 starts from the rising edge of the
request EOF sent by the VCD.
●
If the VCD sends a 100% modulated EOF, the minimum value of t3 is:
t3min = 4384/fC (323.3µs) + tSOF
●
If the VCD sends a 10% modulated EOF, the minimum value of t3 is:
t3min = 4384/fC (323.3µs) + tNRT
where:
●
tSOF is the time required by the LRIS2K to transmit an SOF to the VCD
●
tNRT is the nominal response time of the LRIS2K
tNRT and tSOF are dependent on the LRIS2K-to-VCD data rate and subcarrier modulation
mode.
Table 28.
Inventory request format
Request
SOF
Request_flags Inventory
Optional
AFI
Mask
length
Mask
value
CRC16
Request
EOF
8 bits
01h
8 bits
8 bits
0 - 64 bits
16 bits
Table 29.
Inventory response format
Response
SOF
Response_
flags
DSFID
UID
CRC16
Response
EOF
8 bits
8 bits
64 bits
16 bits



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