ST25TV02K datasheet(66/90 Pages) STMICROELECTRONICS

66 / 90 page

•

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.

6.4.36

Initiate

On receiving the Initiate command, the ST25TV02K/512 set the internal Initiate_flag and sends back a response.

The command has to be issued in the Non Addressed mode only (Select_flag is reset to 0 and Address_flag is

reset to 0). If an error occurs, the ST25TV02K/512 do not generate any answer.

The Initiate_flag is reset after a power off of the ST25TV02K/512.

The request contains:

Table 137. Initiate request format

Request SOF

Request_flags

Initiate

IC Mfg code

CRC16 request

EOF

8 bits

D2h

02h

16 bits

Request parameters:

•

Request flags

•

Initiated command code

Table 138. Initiate response format when Error_flag is NOT set

Response SOF

Response_flags

DSFID

UID

CRC16 request

EOF

8 bits

64 bits

16 bits

Response parameter:

•

DSFID

•

Unique ID

6.4.37

Inventory read

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

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

The request contains:

Table 139. Inventory read request format

Request

SOF

Request_flags

Inventory

Read

IC Mfg

code

AFI (1)

Mask

length

Mask

value

First

block

number

Number

of blocks

CRC16

request

EOF

8 bits

D3h

02h

8 bits

0 -64 bits

8 bits

16 bits

1. The field is optional.

Request parameters:

•

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 inventory read command.

•

Inventory read command code

•

AFI if the AFI flag is set

•

Mask length

•

Mask value

•

First block number

ST25TV02K ST25TV512

RF commands

DS12074 - Rev 11

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