EM4056 데이터 시트보기 (PDF) - EM Microelectronic - MARIN SA

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EM4056

2KBIT Read/Write with ANTICOLLISION Contactless Identification Device

EM Microelectronic - MARIN SA 

EM4056

ReadRom

A ReadRomEn command enables only transponders in the field with RdEn bit set to « 0 » to answer.

With this command, the address of a single new tag entered in the field can be detected because all known transponders

are not allowed to answer if they are deactivated by the RdEn bit (RdEn=1). If more than one transponder answer a CRC

error will be detected and it becomes necessary to perform an arbitration to find all new transponder addresses.

The command is faster than a full arbitration cycle for new tags.

The ReadRomEn command frame consists of three blocks and has a constant length of 13 bits.

The Start bit allows the transponder to synchronise to the new command frame. After the Start bit, the frame contains four

bits for the Command. A CRC block of 8 bits is calculated over the Command and appended to the end.

The transponder frame has a length of 40 bits and starts with the 32 bits ROM block. A CRC block of 8 bits is calculated

over the transponder address (ROM) and appended to the end.

Reader

1 bit

Start

4 bits

MSB

ReadRom

8 bits

X8

CRC

Transponder

32 bits

MSB

tsp

ROM

8 bits

X8

CRC

Fig. 6

SelToggle

A SelToggle command addresses a transponder and toggles the RdEn bit (0→1 or 1→0). The transponder returns a frame

with the changed value of RdEn bit followed by a CRC.

The SelToggle command frame consists of four blocks and has a constant length of 45 bits.

The Start bit allows the transponder to synchronise to the new command frame. After the Start bit the frame contains four

bits for the Command. Next to the Command, a sequence of 32 bits follows with the transponder address. A CRC block of 8

bits is calculated over the Command and the transponder address and appended to the end.

The transponder frame has a length of 10 bits and starts with the RdEn bit and the "not RdEn" bit. A CRC block of 8 bits is

calculated over the RdEn and the "not RdEn" and appended to the end.

Reader

Transponder

1 bit

Start

4 bits

MSB

SelToggle

32 bits

MSB

ROM

8 bits

X8

CRC

tsp

2 bits

RdEn nRdEn

8 bits

X8

CRC

Fig. 7

SelTag

The SelTag command address a transponder with its 32 bit address (ROM) and set the flag Select to 1. After this command,

the selected transponder can answer to commands : Read, Write, Prot, Add, Comp and Login.

Reader

Transponder

1 bit

Start

4 bits

MSB

SelTag

32 bits

MSB

ROM

8 bits

X8

CRC

tsp

2 bits

Sel nSel

8 bits

X8

CRC

Fig. 8

Copyright © 2005, EM Microelectronic-Marin SA

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