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SRTAG2K-D bảng dữ liệu(PDF) 22 Page - STMicroelectronics

tên linh kiện SRTAG2K-D
Giải thích chi tiết về linh kiện  NFC Forum Type 4 Tag IC with 2-Kbit EEPROM and RF Session digital output
PDF  51 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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RF command sets
SRTAG2K-D
22/51
DocID025446 Rev 3
5.4
S-Block format
The S-Block is used to exchange control information between a reader and a contactless
tag.
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 or I2C, when the operating time
needed by M24SRxx is greater than 9.6 ms.
The WTX field indicates the increase time factor to be used in this command execution
(FDTtemp = WTX * 9.6 ms).
Table 15. R-Block detailed format
b7-b6
b5
b4
b3
b2
b1
b0
0b10
1
X
X
0
0
X
R-Block
RFU
0: NAK
1: ACK
0: DID field is not present
1: DID field is present
Must be set to 0
RFU
Block number
Table 16. S-Block format
NFC frame
SoD
EoD
PCB
DID
Payload
CRC
Length
1 byte
1 byte
1 to 255 bytes
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 (1)
2 CRC bytes
1. This field is present when b5-b4 bits are set to 0b11 (S-Block is a WTX). see Table 17: S-Block detailed format.



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