Example of Arbitration protocol *
Read ROM
No
Yes
CRC error ?
Reset flag
Read next bit
(from LSB to MSB)
Yes
0 and 1 ?
No
Set flag
Yes
0?
EM4056
No
Chosen bit: 0
Chosen bit: 0
Chosen bit: 1
All tags are identified
No
Yes
MSB ?
Chosen bit: 1
No
Yes
Flag set ?
*patented by Biel School of Negineering, MicroLab I3S
Fig. 21
Copyright © 2005, EM Microelectronic-Marin SA
12
www.emmicroelectronic.com