LRI1K datasheet(48/86 Pages) STMICROELECTRONICS

48 / 86 page

Commands codes

LRI1K

48/86

Doc ID 17170 Rev 3

20.1

Inventory

When receiving the Inventory request, the LRI1K runs the anticollision sequence. The

Inventory_flag is set to 1. The meaning of flags 5 to 8 is shown in Table 13: Request flags 5

to 8 when bit 3 = 1.

The request contains:

●

the flags,

●

the Inventory command code (see Table 20: Command codes)

●

the AFI if the AFI flag is set

●

the mask length

●

the mask value

●

the CRC

The LRI1K 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 LRI1K 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 LRI1K to transmit an SOF to the VCD

●

tNRT is the nominal response time of the LRI1K

tNRT and tSOF are dependent on the LRI1K-to-VCD data rate and subcarrier modulation

mode.

Table 21.

Inventory request format

Request

SOF

Request

flags

Inventory

Optional

AFI

Mask

length

Mask value

CRC16

Request

EOF

8 bits

01h

8 bits

0 - 64 bits

16 bits

Table 22.

Inventory response format

Response

SOF

Response

flags

DSFID

UID

CRC16

Response

EOF

8 bits

64 bits

16 bits

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