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參數(shù)資料
| 型號： | LRI512-C40 |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | DRAM |
| 英文描述： | EEPROM |
| 中文描述： | EEPROM的 |
| 文件頁數(shù)： | 22/54頁 |
| 文件大?。?/td> | 351K |
| 代理商： | LRI512-C40 |
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LRI512
22/54
ANTI-COLLISION
The purpose of the anti-collision sequence is to in-
ventory the LRI512s present in the VCD field by
their unique ID (UID).
The VCD is the master of the communication with
one or multiple LRI512s. It initiates LRI512 com-
munication by issuing the Inventory Request.
The LRI512 sends its Response in the slot deter-
mined, or might not respond.
Request parameters
When issuing the Inventory Command, the VCD
shall:
– set the Nb_slots_flag to the desired setting,
– add after the Command Field the Mask Length
and the Mask Value,
– The Mask Length is the number of significant
bits of the Mask Value.
– The Mask Value is contained in an integer num-
ber of bytes. The Mask Length indicates the
number of significant bits. LSB shall be transmit-
ted first.
– If the Mask Length is not a multiple of 8 bits, the
Mask Value MSB shall be padded with the re-
quired number of null bits (set to 0) so that the
Mask Value is contained in an integer number of
bytes.
– The next field starts on the next byte boundary.
Table 17. Inventory Request Format
In the example of the Table 18 and Figure 31, the
Mask Length is 11 bits. The Mask Value MSB is
padded with five bits set to 0. The 11 bits Mask
plus the current slot number is compared to the
UID.
Table 18. Example of the Padding of a 11 bits
Mask Value
MSB
LSB
SOF
Request
Flags
Command
Optional AFI
Mask
Length
Mask Value
CRC
EOF
8 bits
8 bits
8 bits
8 bits
0 to 8 bytes
16 bits
(b
15
) MSB
LSB (b
0
)
0000 0
100 1100 1111
Pad
11 bits Mask Value
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