SRTAG512L datasheet(25/51 Pages) STMICROELECTRONICS

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SRTAG512L

RF command sets

Note:

After receiving the deselect command, the session is released and SRTAG512L enters the

Standby power mode.

In response to a RATS command, SRTAG512L returns FWI parameter (default frame waiting

time used); when SRTAG512L needs more time for a command execution, it requests a

frame waiting time extension by responding 0xF2 0xWTX (Request waiting time = FWI *

WTX). If the reader accepts SRTAG512L request, it acknowledges by sending the command

0xF2 0xWTX. The frame waiting time becomes FWI * WTX for the current command only.

5.5

CRC of the RF frame

The two CRC bytes check the data transmission between the RF host and the SRTAG512L.

For the RF frame, the CRC is computed on all the data bits in the frame, excluding parity

bits, SOF and EOF, and the CRC itself.

The CRC is as defined in ISO/IEC 13239. The initial register content shall be 0x6363 and

the register content shall not be inverted after calculation.

5.6

NFC Forum Type 4 Tag protocol

5.6.1

Commands set

SRTAG512L command set is built to easily support the NFC Forum Type 4 Tag protocol.

Table 18. S-Block detailed format

b7-b6

b5-b4

0b11

S-Block

0b00: Deselect

0b11: WTX

0: DID field is not present

1: DID field is present

Must be set to 0

Must be set to 1

Must be set to 0

Table 19. Command set overview

Command name

Brief description

NDEF Tag Application Select

Select the NDEF Tag Application

Capability Container Select

Select the capability container (CC) file using the

Select command

NDEF Select

Select the NDEF file using the Select command.

System File Select

Select the system file using the Select command.

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