LRIS64K datasheet(85/100 Pages) STMICROELECTRONICS

85 / 100 page

LRIS64K

Commands codes

Doc ID 15336 Rev 11

85/100

24.18

Fast Inventory Initiated

Before receiving the Fast Inventory Initiated command, the LRIS64K must have received an

Initiate or a Fast Initiate command in order to set the Initiate_ flag. If not, the LRIS64K does

not answer to the Fast Inventory Initiated command.

On receiving the Fast Inventory Initiated request, the LRIS64K 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,

●

the Inventory command code

●

the AFI if the AFI flag is set

●

the mask length

●

the mask value

●

the CRC

The LRIS64K 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 LRIS64K 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 LRIS64K to transmit an SOF to the VCD

●

tNRT is the nominal response time of the LRIS64K

Table 81.

Fast Inventory Initiated request format

Request

SOF

Request

_flags

Fast

Inventory

Initiated

IC Mfg

code

Optional

AFI(1)

Gray means that the field is optional.

Mask

length

Mask value

CRC16

Request

EOF

8 bits

C1h

02h

8 bits

0 - 64 bits

16 bits

Table 82.

Fast Inventory Initiated response format

Response

SOF

Response

_flags

DSFID

UID

CRC16

Response

EOF

8 bits

64 bits

16 bits

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