EM4056B6CB2RC 데이터 시트보기 (PDF) - EM Microelectronic - MARIN SA

부품명

상세내역

일치하는 목록

EM4056B6CB2RC

2KBIT Read/Write with ANTICOLLISION Contactless Identification Device

EM Microelectronic - MARIN SA 

EM4056

Add

Add command to add one 16-bit data word to another 16-bit data word pointed by the specified address, this command

writes the sum at the specified address. It is possible to add a value to an already protected memory location that has been

protected against reading, but not to a memory location that has been protected against writing attempts.

Reader

1 bit

Start

4 bits

MSB

Add

Transponder

8 bits

MSB

Address

16 bits

MSB

Datas

8 bits

X8

CRC

2 bits

twp WOk nWOk

8 bits

X8

CRC

Fig. 14

Comp

Compares a 16 bits data word with another word pointed by the specified address.

It is possible to perform a comparison with a value pointed by a read protected address.

But it is impossible to compare a value with another one in the opaque area without entering the PIN. In the case of PIN

violation, the result of the comparison is always false.

Ega=1, comparison successful.

Reader

1 bit

Start

4 bits

MSB

Comp

8 bits

MSB

Address

16 bits

MSB

Datas

Transponder

8 bits

X8

CRC

2 bits

8 bits

X8

trp Ega nEga CRC

Fig. 15

Login

Compares a 16 bit data word with the PIN word at the address 127.

When a PIN comparison is made (Adr 127) and the identity is established, a write operation occurs in the EEPROM, PIN =

CONF , the success bit is released (SUC = 0), the PIN counter is decremented (PIN = PIN - 1) and the corresponding new

value is written in the EEPROM.

After n erroneous attempts (PIN=0), the ALM bit is set (ALM = 1), and written in the EEPROM. Since that moment the entire

memory is irreversibly locked. The unprotected data words (Rp=0) remain accessible for reading the information they are

containing.

Reader

1 bit

Start

4 bits

16 bits 8 bits

MSB LSB MSB LSB X8 1

Login

Datas

CRC

4 bits

Transponder

twp Ega nEga WOk nWOk

8 bits

X8 1

CRC

Ega=1, password ok. Wok=1, writing operation successful.

Fig. 16

Copyright © 2005, EM Microelectronic-Marin SA

9

www.emmicroelectronic.com

Share Link: