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EM4223V2WS11 参数 Datasheet PDF下载

EM4223V2WS11图片预览
型号: EM4223V2WS11
PDF下载: 下载PDF文件 查看货源
内容描述: 只读超高频射频识别设备 [Read-only UHF Radio Frequency Identification Device]
分类和应用: 射频
文件页数/大小: 29 页 / 426 K
品牌: EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
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R
EM4223  
Transponders will only transmit Data Messages to the  
Reader while they are in the ROUND_ACTIVE state.  
When the CURRENT SLOT NUMBER and the  
SELECTED SLOT NUMBER values held by the  
Transponder match, the Transponder transmits its Data  
Message to the Reader. The Reply message will contain  
either the SUID (the Integrated Circuit Manufacturer code  
of 0x16 for MARIN and the lower 32 bits of the 128 bit  
User Data) or the 128 bit User Data .  
The BEGIN_ROUND command is included for Supply  
Chain Logistics support.  
In addition to the above, the Fast Supertagcommands:  
WAKE_UP_FST and MUTE are supported for compliance  
with the FST protocol. MUTE is interpreted as any  
partially decoded or invalid command as described in  
section 0.  
3. BASIC COMMAND FORMATS  
There are 7 short commands, 2 extended commands and  
1 implied command.  
In situations where different groups of transponders  
present in the reader field contain data having different  
owners, a reader may selectively wake up these different  
groups of transponders by means of the ISO compliant  
AFI parameter in the Init_Round command or by using the  
Mask parameter in the Begin_Round command. The  
Begin_Round command additionally supports selection of  
groups of transponders based on the user data content  
according to the EPC™ method.  
Short commands  
Short commands are a fixed length of 16 bits, which  
includes a 5 bit CRC. The commands comprise the  
following fields:  
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Protocol extension – 1 bit.  
Command Op-code – 6 bits.  
Parameters – 4 bits (parameters could include flags).  
CRC – 5 Bits.  
General Command Format  
All commands are transmitted from the Reader to the  
Transponder by means of pulse interval encoding as  
defined in chapter 5: forward link encoding, beginning with  
an SOF (Start Of Frame) and terminating in an EOF (End  
Of Frame). Commands are supported in accordance with  
the ISO 18000-6A specification which divides commands  
into the categories of MANDATORY, OPTIONAL,  
CUSTOM and PROPRIETARY. The EM4223 supports all  
of the ISO 18000-6A MANDATORY commands and 4 of  
the ISO 18000-6A OPTIONAL commands – Init_Round,  
Close_Slot, New_Round and Begin_Round. In addition,  
the EM4223 implements 1 PROPRIETARY command in  
accordance with the ISO 18000-6A specification – this is  
the Wake_Up_FST command which uses Op-Code 0x39.  
SOF  
RFU  
(1 bit)  
Command  
Code (6 bits)  
Parameters &  
Flags (4 bits)  
CRC-5  
(5 bits)  
EOF  
Fig. 3 General format, Short commands  
Short commands are used for collision arbitration and  
other immediate functions.  
Extended commands  
The EM4223 supports  
2
Extended commands  
(Init_Round and Begin_Round). They comprise a fixed  
length part of 16 bits, which is identical with the format of  
the 16 bit Short Commands described above, followed by  
an 8 bit fixed length parameter in the case of both of the  
Extended commands, followed by a 2nd parameter of  
variable length up to 136 bits and terminated with a 16 bit  
CRC. The Extended commands comprise the following  
fields:  
Commands are divided into  
2 basic types: Short  
Commands of a fixed 16 bit length and Extended  
commands which consist of a 16 bit section consistent  
with the Short Command format followed by a variable  
length extension containing various parameters and a  
second CRC of 16 bit length which covers the entire  
command, including the 1st 11 bits which will already have  
been covered by the 5 bit CRC and the 5 bit CRC itself.  
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Protocol extension – 1 bit.  
Command Op-code – 6 bits.  
Parameters – 4 bits (parameters could include flags).  
CRC – 5 Bits.  
Extension of 8 bits (AFI) in the case of the  
Supported Command set  
The EM4223 fully supports the four ISO MANDATORY  
commands:  
NEXT_SLOT,  
STANDBY_ROUND,  
INIT_ROUND  
command,  
or  
an  
8
bit  
RESET_TO_READY and INIT_ROUND_ALL.  
(MASK_LENGTH) parameter followed by a variable  
length (MASK) parameter in the case of the  
BEGIN_ROUND command  
The ISO OPTIONAL commands: INIT_ROUND,  
CLOSE_SLOT, and NEW_ROUND are also supported.  
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CRC-16 :- 16 Bits (over full message from after the  
SOF to the last bit before the CRC16 itself).  
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Copyright © 2005, EM Microelectronic-Marin SA  
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