SRTAG2KL View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'SRTAG2KL' PDF : 51 Pages View PDF
RF command sets
b7-b6
0b10
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
Table 16. R-Block detailed format
b5
b4
b3
b2
1
X
X
0
SRTAG2KL
b1
b0
0
X
5.4
S-Block format
The S-Block is used to exchange control information between a reader and a contactless
tag.
NFC frame
Table 17. S-Block format
SoD
PCB
DID
Payload
EoD
CRC
Length
1 byte
1 byte
1 byte
2 bytes
0xC2: for S(DES) when the DID field is not
present
0xCA: for S(DES) when the DID field is present
0xF2: for S(WTX) when the DID field is not
present
0xFA: for S(WTX) when the DID field is present
DID field (optional)
WTX field (optional)(1)
2 CRC bytes
1. This field is present when b5-b4 bits are set to 0b11 (S-Block is a WTX). see Table 18: S-Block detailed
format.
There are two requests using the S-Block format:
• S(DES): the deselect command
• S(WTX): the Waiting Frame eXtension command or response.
A Waiting Time eXtension request occurs in RF when the operating time needed by
SRTAG2KL is greater than 19.2 ms.
The WTX field indicates the increase time factor to be used in this command execution
(FDTtemp = WTX * 19.2 ms). WTX depends on FWI.
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