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EM4069B5WT11E Datasheet(PDF) 7 Page - EM Microelectronic - MARIN SA |
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EM4069B5WT11E Datasheet(HTML) 7 Page - EM Microelectronic - MARIN SA |
7 / 15 page EM4069 EM4169 Copyright 2003, EM Microelectronic-Marin SA 7 www.emmicroelectronic.com ROM organization The ROM is composed of 64 bits divided in a 9-bit header, 10 nibbles of 4 data bits and 1 row even parity bit, 4 column even parity bits, and 1 stop bit. The Read ROM command will output the contents of the ROM, starting with bit-0. When bit-64 is output, the sequence continues with bit-0. Data in ROM is written by laser programming during manufacturing to form a unique identification code. Figure below presents the ROM data structure. Bits P0 to P9 are row parity bits and bits PC0 to PC3 are column parity bits. Parity is even so that a 9 bits set to logic one header can not be reproduced in a data stream. Bit 0 111111111 Bit 8 Header Bit 9 D00 D01 D02 D03 P0 Bit 13 8 bits customer ID Bit 14 D10 D11 D12 D13 P1 Bit 18 Bit 19 D20 D21 D22 D23 P2 Bit 23 Bit 24 D30 D31 D32 D33 P3 Bit 28 Bit 29 D40 D41 D42 D43 P4 Bit 33 Unique Bit 34 D50 D51 D52 D53 P5 Bit 38 device Bit 39 D60 D61 D62 D63 P6 Bit 43 serial Bit 44 D70 D71 D72 D73 P7 Bit 48 number Bit 49 D80 D81 D82 D83 P8 Bit 53 Bit 54 D90 D91 D92 D93 P9 Bit 58 Bit 59 PC0 PC1 PC2 PC3 0 Bit 63 Column parity bits Fig. 8 Customer ID for all standard versions is 01 hex. Command description The EM4069 operates in different modes. The default following a Power on Reset is Read EEPROM mode, and by means of different commands, the circuit can switch to the following modes : read access to ROM write access to 16 bits of EEPROM write access to configuration word read access to configuration word The reader has to generate the commands, which have to be decoded by the EM4069. Command Command Short name Bit pattern Function Command 1 rst 1010 0000 Reset and return to EEPROM read Command 2 rROM 1010 0101 READ 64 bit ROM Command 3 wr 1100.add.data.crc WRITE 16 bit EEPROM word Command 4 wcw 1101 0011.prot.crc WRITE configuration word Command 5 rcw 1111 0000 Read configuration word Commands rst, rROM and rcw affect readout. An eight-bit pattern has to be sent to execute them. Write commands are longer since associated address and data have to be sent. The leftmost bit in command bit pattern is transferred first. Command 1: Reset command During activation of the transponder a return to default mode is possible from any mode with the reset command. Command 2 : Read out of ROM 64 Bits After activation of command 2, the 64 bit ROM data will be read out cyclically. This mode will be active until power down or reset command. Command 3 : Write 16 Bit EEPROM word After activation of command 3, a 16-bit EEPROM word can be written. Data transmission will be secured by CRC check information, which has to be calculated by the reader and which will be checked by the EM4069. Command 4 : Write configuration word Command 4 has the same structure as command 3. The 16-bit configuration word is written by this command. A partial locking (write inhibit) of the 128 bit memory is possible in blocks of 16 bits (16 bit word becomes read- only). The bits of configuration word are OTP (one time programmable) so once a certain bit in configuration word is set it cannot be reset. |
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