ST25TV02K datasheet(67/90 Pages) STMICROELECTRONICS

67 / 90 page

•

Number of blocks

Table 140. Inventory read response format

Response SOF

Request_flags

DSFID

UID

Block security status (1)

Data

CRC16 request

EOF

8 bits

64 bits

8 bits (2)

32 bits (2)

16 bits

1. The field is optional.

2. The group of Block security status (if any), and its data are repeated if needed, for up to the number of blocks requested.

Request parameter:

•

Unique ID

•

Block security status if Option_flag is set (see Table 46. Block security status)

•

N blocks of data

Table 141. Block security status

Reserved for future use.

All at 0.

0: Current block not locked

1: Current block locked

During an Inventory Read process, if the VCD does not receive an RF ST25TV02K/512 response, it waits t3 time

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 (323.3 μs) + tSOF

•

If the VCD sends a 10% modulated EOF, the minimum value of t3 is:

t3min = 4384/fC (323.3 μs) + tNRT

•

where:

tSOF is the time required by the ST25TV02K/512 to transmit an SOF to the VCD

tNRT is the nominal response time of the ST25TV02K/512

tNRT and tSOF are dependent on the ST25TV02K/512-to-VCD data rate and subcarrier modulation mode.

6.4.38

Fast inventory read

The Fast inventory read performs an inventory followed by a multiple block read.

The response is at twice the data rate.

If an error is detected, no matter if on the inventory or the read part, ST25TV02K/512 do not answer.

The request contains:

Table 142. Fast Inventory read request format

Response

SOF

Request_flags

Fast

inventory

read

IC Mfg

code

AFI (1)

Mask

length

Mask

value

First block

number

Number of

blocks

CRC16

request

EOF

8 bits

D4h

02h

8 bits

0 -64 bits

8 bits

16 bits

1. The field is optional.

Response parameter:

•

Request flags. The Nb_slots flag (bit 6) of the Request flags bits 5 to 8 described in , must be set to 1 for 1

slot inventory. 16 slot inventory is not supported in the Fast Inventory read command

•

Fast Inventory read command code

ST25TV02K ST25TV512

RF commands

DS12074 - Rev 11

page 67/90

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