EM4170

Copyright

 2002, EM Microelectronic-Marin SA

5

www.emmicroelectronic.com

Memory Map

0

Bit 31

Bit

0

9

7

6

5

8

4

Bit15

Bit0

3

2

1

UM1 15

UM1 0

Crypt Key 95

Crypt Key 80

Crypt Key 63

Crypt Key 48

Crypt Key 47

Crypt Key 32

Crypt Key 31

Crypt Key 16

Crypt Key 79

Crypt Key 64

Crypt Key 15

Crypt Key 0

ID 31

ID 16

ID 0

LB1,LB0,UM1 29

UM1 16

ID 15

word 15

14

13

12

11

10

UM2 63

UM2 48

UM2 47

UM2 32

UM2 31

UM2 16

UM2 15

UM2 0

PIN 31

PIN 16

PIN 15

PIN

0

Fig. 4

Standby Mode

After a Power-On Reset and upon completion of a command, the chip will execute the Standby Mode, in which it will

continuously send LIWs to allow the reader to issue commands. As every LIW has a duration of 160 periods of the RF field

the reader can turn to Receive mode every 1.3ms at 125kHz.

Receive Mode

To change from Standby Mode to another operation the chip has to be brought into Receive Mode. To do this the

Transceiver sends to the chip the RM pattern during the 32 clocks of modulated phase in a Listen Window (LIW). The

EM4170 will stop sending data upon reception of a valid RM. The RM pattern consists of 2 bits "0" sent by the transceiver.

The first "0" is to be detected during the 32 periods when the modulation is "ON" in the LIW. Next the EM4170 expects a

command to specify the operation to be executed.