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EM4350A6WW27 Datasheet(PDF) 5 Page - EM Microelectronic - MARIN SA |
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EM4350A6WW27 Datasheet(HTML) 5 Page - EM Microelectronic - MARIN SA |
5 / 14 page R EM4150 EM4350 Standard Read Mode After a Power-On Reset and upon completion of a command, the chip will execute the Standard Read Mode, in which it will send data continuously, word by word from the memory section defined between the First Word Read (FWR) and Last Word Read (LWR). When the last word is output, the chip will continue with the first word until the transceiver sends a request. If FWR and LWR are the same, the same word will be sent repetitively. The Listen Window (LIW) is generated before each word to check if the transceiver is sending data. The LIW has a duration of 320 (160 opt 32) periods of the RF field. FWR and LWR have to be programmed as valid addresses (FWR ≤ LWR and ≤ 33). The words sent by the EM4150 comprise 32 data bits and parity bits. The parity bits are not stored in the EEPROM, but generated while the message is sent as described below. The parity is even for rows and columns, meaning that the total number of "1's" is even (including the parity bit). Word Organisation (Words 0 to 32) D0 D8 D16 D24 PC0 D1 D9 D17 D25 PC1 D2 D10 D18 D26 PC2 D3 D11 D19 D27 PC3 D4 D12 D20 D28 PC4 D5 D13 D21 D29 PC5 D6 D14 D22 D30 PC6 D7 D15 D23 D31 PC7 P0 P1 P2 P3 0 First bit output Row Even Parity Last bit output logic "0" Column Even Parity Data Fig. 7a When a word is read protected, the output will consist of 45 bits set to logic "0". The password has to be used to output correctly a read protected memory area. Word Organisation (Word 33) C0 ID2 R0 CK0 PC0 C1 ID3 R1 CK1 PC1 C2 ID4 R2 CK2 PC2 C3 ID5 R3 CK3 PC3 C4 ID6 R4 CK4 PC4 C5 ID7 R5 CK5 PC5 ID0 ID8 R6 CK6 PC6 ID1 ID9 R7 CK7 PC7 P0 P1 P2 P3 0 : P4150 Code set to Hexadecimal 32 : Version Code : EM reserved, and Check bits C0 ID0 R0 - C5 - ID9 - R7 / CK0 - CK7 Fig. 7b Read Sequence POR OUTPUT LIW D0-D7 P0 D8-D15 P1 D16-D23 P2 D24-D31 P3 PC0-PC7 "0" T0 = Period of RF carrier frequency INIT LIW FWR LIW FWR+1 LWR LIW FWR LIW LIW LIW Coded Data Data 1 bit - 64 T0 periods (Opt64) 32 T0 periods (Opt32) T0 periods : 32 32 128 64 64 (Opt64) 16 16 64 32 32 (Opt32) Fig. 8 Receive Mode To activate the Receive Mode, the Transceiver sends to the chip the RM pattern (while in the modulated phase of a Listen Window LIW). The EM4150 will stop sending data upon reception of a valid RM. The chip then expects a command. The RM pattern consists of 2 bits "0" sent by the transceiver. The first bit "0" transmitted is to be detected during the 64 (32 opt 32) periods where the modulation is "ON" in LIW. OUTPUT WORD n LIW INPUT RM COMMAND RM : Two Consecutive bits set to logic "0" Fig. 9 Commands The commands are composed of nine bits : eight data bits and one even parity bit (total amount of "ones" is even including the parity bit). LOGIN WRITE PASSWORD WRITE WORD SELECTIVE READ MODE RESET 0 0 0 0 0 0 0 1 1 0 0 0 1 0 0 0 1 0 0 0 0 1 0 0 1 0 0 0 0 0 0 1 0 1 0 0 1 0 0 0 0 0 0 0 1 COMMAND BITS FUNCTION Parity bit First bit Received Fig. 10 Selective Read Mode The Selective Read Mode is used to read other data than that defined between FWR and LWR. To enter Selective Read Mode, the Transceiver has to send during LIW a Receive mode pattern (RM) to turn the EM4150 in Receive Mode. Then the Selective Read Mode Command is sent by the transceiver followed by the First and Last addresses to be read. The FWR and LWR are then replaced by the new addresses and the chip is operating in the same way as the Standard Read Mode. The control word is not modified by this command, and the next standard read mode operation will work with original FWR and LWR (Selected area is read once and then the chip returns to Standard Read Mode). To read words which are Read Protected, a Login command has to be sent by the transceiver prior to the Selective Read command. The Login command is to be used only once for all subsequent commands requiring a password. Copyright © 2004, EM Microelectronic-Marin SA 5 www.emmicroelectronic.com |
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