LRIS2K datasheet(85/102 Pages) STMICROELECTRONICS

85 / 102 page

LRIS2K

Fast Inventory Initiated

85/102

Fast Inventory Initiated

Before receiving the Fast Inventory Initiated command, the LRIS2K must have received an

Initiate or a Fast Initiate command in order to set the Initiate_ flag. If not, the LRIS2K does

not answer to the Fast Inventory Initiated command.

On receiving the Fast Inventory Initiated request, the LRIS2K runs the anticollision

sequence. The Inventory_flag must be 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 data rate of the response is multiplied by

The request contains the:

●

flags

●

Inventory command code

●

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

●

the 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 83.

Fast Inventory Initiated request format

Request

SOF

Request

Flags

Fast

Inventory

Initiated

IC Mfg

code

Optional

AFI

Mask

length

Mask value

CRC16

Request

EOF

8 bits

C1h

02h

8 bits

0 - 64 bits

16 bits

Table 84.

Fast Inventory Initiated response format

Response

SOF

Response

_flags

DSFID

UID

CRC16

Response

EOF

8 bits

00h

64 bits

16 bits

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