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ATA555812-PAE Datasheet(PDF) 9 Page - ATMEL Corporation |
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ATA555812-PAE Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 42 page  9 4681C–RFID–09/05 ATA5558 [Preliminary] 2.8 Tag Configuration Register The internal tag configuration register holds a shadow copy of the configuration settings stored in the system memory’s block 63. It is refreshed after every POR cycle (RF field on), Reset to Ready or Write to block 63. Figure 2-7. Configuration Register 3. Transmission Protocol The transmission protocol defines the mechanism to exchange commands and data between the interrogator and the tags. In all but the Public and EAS Mode, the interrogator has complete control over the communication flow – all data transmission being synchronized to interrogator commands and the interrogator field clock – “Interrogator Talks First” (ITF) principle. This means that a tag does not transmit data, unless it has received and properly decoded an interrogator command. The protocol is based on an exchange of • commands from the interrogator to the tag (Downlink mode) • and response from the tag to the interrogator (Uplink mode) ITF =Interrogator Talks First Mode PM = Public Mode EAS = Electrical Article Surveillance NRZ = Non Return to Zero Notes: (1) If master key = 6hex then all test modes are ignored and password protection enabled (2) If DDR = 1 and master key = 6hex or 9hex then data rate = fast, otherwise slow R = reserved for future use, should be set to 0 x = don't care state L a4 a3 p2 a2 a1 a0 RF/2(n+1) ...LSB MSB... 32 1 0 76 5 4 15 14 13 12 19 18 17 16 23 22 21 20 11 10 9 8 27 26 25 24 31 30 29 28 1 1 0 0 0 = Reserved Max. Block 0 = Unlocked 1 = Locked R R Uplink Data Bit Rate 00 0 00 1 01 0 01 1 10 0 10 1 11 0 11 1 = 16 bit = 32 bit = 48 bit = 64 bit = 80 bit = 96 bit = 40 bit = 56 bit 1 = Downlink CRC check mandatory TagID Length Downlink Data Rate (DDR)(2) 0 0 R 00 01 10 11 = Manchester = NRZ (Direct Coding) = FDX-B (Biphase) = Reserved Uplink Encoding SOF Preamble Length ( bit periods ) = 1 = 2 . . = 8 00 0 00 1 .. . .. . 11 1 Master Key(1) Lock Bit p1 p0 0 n4 n3 n2 n1 n0 x0 01 11 = ITF = PM = EAS Operating Mode |
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