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ATA555811M01-DDT Datasheet(PDF) 11 Page - ATMEL Corporation |
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ATA555811M01-DDT Datasheet(HTML) 11 Page - ATMEL Corporation |
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11 / 42 page  11 4681C–RFID–09/05 ATA5558 [Preliminary] Figure 3-2. SOF Pattern 3.1.2 Public Mode 1. In Public Mode the cyclic data stream will be preceded by a single SOF pattern after the completion of the POR delay. 2. The variable number of preamble data bits is aimed at easing the interrogator design and optimizing system performance. 3. Within any closed identification system the preamble length for all tags must be identical. 3.2 Interrogator to Tag Communication All commands and data bit streams from the interrogator to the tag are 100% (OOK – On-Off-Key) modulated using a modified 1 out of 4 pulse position coding. Depending on the data, the continuous RF field is interspersed with short field gaps of constant duration and vari- able separation. The time from one gap to the next may take on one of four discrete values. Each of these represent one of four possible dual bit downlink data codes ( 00 .. 11) in the data stream (see Figure 3-3). The downlink data transfer speed is dependent on the downlink data rate (DDR) bit set in the tag configuration block, so that selected tags can always understand the interrogator. The minimum write data coding (maximum data rate) is 9 field clocks. This corre- sponds with the d 00 (dref) parameter in Figure 3-3 and Table 3-1 on page 12. Figure 3-3. Interrogator to Tag - Modified 1 out of 4 Pulse Position Coding SOF 2 bit period code violation Example with p = 4 bit periods Preamble length = 3 W gap S gap Downlink mode Uplink mode d 00 d ref d 01 d 11 d 10 |
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