ST25TA02K-D Datasheet, PDF (32/64 Pages) STMicroelectronics – NFC Forum Type 4 Tag IC with 2-Kbit EEPROM and general purpose digital output

RF command sets
ST25TA02K-D
5.3
R-Block format
The R-Block is used to convey positive or negative acknowledgment between the RF host
and the ST25TA02K-D.
NFC frame
Table 16. R-Block format
SoD
PCB
DID
-
Payload
EoD
CRC
Length
1 byte
R(ACK) without the DID field: 0xA2 or 0xA3
R(ACK) with the DID field: 0xAA or 0xAB
R(NAK) without the DID field: 0xB2 or 0xB3
R(NAK) with the DID field: 0xBA or 0xBB
DID field (optional)
-
2 CRC bytes
1 byte
0 byte
2 bytes
There are two kinds of R-Blocks:
• R(ACK): the acknowledgment block sent by the RF host or by the ST25TA02K-D
• R(NAK): the non-acknowledgment block sent by the RF host
Table 17. R-Block detailed format
b7-b6
b5
b4
b3
b2
b1
b0
0b10
1
X
X
0
0
X
R-Block
Must be set to 1.
0: NAK
1: ACK
0: DID field is not present
1: DID field is present
Must be set to 0
Must be set to 0
Block number
32/64
DocID027817 Rev 1