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EM4223V2WS7E Datasheet(PDF) 6 Page - EM Microelectronic - MARIN SA |
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EM4223V2WS7E Datasheet(HTML) 6 Page - EM Microelectronic - MARIN SA |
6 / 29 page R EM4223 Copyright © 2005, EM Microelectronic-Marin SA 6 www.emmicroelectronic.com 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 . 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. 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. 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 1 st 11 bits which will already have been covered by the 5 bit CRC and the 5 bit CRC itself. Supported Command set The EM4223 fully supports the four ISO MANDATORY commands: NEXT_SLOT, STANDBY_ROUND, RESET_TO_READY and INIT_ROUND_ALL. The ISO OPTIONAL commands: INIT_ROUND, CLOSE_SLOT, and NEW_ROUND are also supported. The BEGIN_ROUND command is included for Supply Chain Logistics support. In addition to the above, the Fast Supertag ™ commands: 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 56H56H 0. 3. BASIC COMMAND FORMATS There are 7 short commands, 2 extended commands and 1 implied command. Short commands Short commands are a fixed length of 16 bits, which includes a 5 bit CRC. The commands comprise the following fields: Protocol extension – 1 bit. Command Op-code – 6 bits. Parameters – 4 bits (parameters could include flags). CRC – 5 Bits. 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 2 nd parameter of variable length up to 136 bits and terminated with a 16 bit CRC. The Extended commands comprise the following fields: 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 INIT_ROUND command, or an 8 bit (MASK_LENGTH) parameter followed by a variable length (MASK) parameter in the case of the BEGIN_ROUND command CRC-16 :- 16 Bits (over full message from after the SOF to the last bit before the CRC16 itself). |
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