at88rf1354 ATMEL Corporation, at88rf1354 Datasheet - Page 28

• Manufacturer Part Number: at88rf1354
• Description: 13.56 Mhz Type B Rf Reader Specification
• Manufacturer: ATMEL Corporation

A.3.
A.4.
28
13.56 MHz Type B RF Reader
Frame Format
Data transmitted by the PCD or PICC is sent as frames. The frame consists of the start of frame (SOF), several
bytes of information, and the end of frame (EOF). The SOF and EOF requirements are shown in Figure A-2.
Figure A-2.
Start of Frame
Reader Data Transmission
The unmodulated 13.56 Mhz carrier signal amplitude which is transmitted when the reader is idle is defined as logical
“1”, while the modulated signal level is defined as logical “0”. A frame transmitted by the reader consists of SOF,
several bytes of data, a 2 byte CRC_B, and the EOF.
Figure A-3.
No Modulation ("1"s)
End of Frame
Start of Frame (SOF) and End of Frame (EOF) format requirement
Format of a frame transmitted by the reader to the card.
Last Byte
SOF
Total start of frame length is 12 to 14 ETUs.
10 to 11 ETUs of "0"s
Command, Data, and CRC_B
Total end of frame length is 10 to 11 ETUs.
Data Transmission
10 to 11 ETUs of "0"s
2 to 3 ETUs "1"s
EOF
No Modulation ("1"s)
Start b0
First Byte
8547A−RFID−10/08
b1