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MAX66040K Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX66040K Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 25 page ISO/IEC 14443 Type B frame are an inverted 16-bit CRC of the preceding data characters generated according to the CRC-16-CCITT polynomial. This CRC is transmitted with the LSB first. For more details on the CRC-16-CCITT, refer to ISO/IEC 14443-3, Annex B. With network function commands, the command code, parameters, and response are embedded between SOF and CRC. With memory function commands, com- mand code, and parameters are placed into the infor- mation field of I-blocks (see the Block Types section), which in turn are embedded between SOF and EOF. For transmission, the frame information is modulated on a carrier frequency, which in the case of ISO/IEC 14443 is 13.56MHz. The subsequent paragraphs are a con- cise description of the required modulation and coding. For full details including SOF/EOF and subcarrier on/off timing, refer to ISO/IEC 14443-3, Sections 7.1 and 7.2. The path from master to slave uses amplitude modula- tion with a modulation index between 8% and 14% (Figure 8). In this direction, a START bit and logic 0 bit correspond to a modulated carrier; STOP bit and logic 1 bit correspond to the unmodulated carrier. EOF ends with an unmodulated carrier instead of STOP bits. ISO/IEC 14443 Type B-Compliant Secure Memory 8 _______________________________________________________________________________________ ABRIDGED DATA SHEET START 1 0 BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 9 STOP/IDLE BIT 8 Figure 6. ISO/IEC 14443 SOF/EOF Character Format SOF ONE OR MORE DATA CHARACTERS CRC (LSB) CRC (MSB) EOF TIME Figure 7. ISO/IEC 14443 Frame Format A B CARRIER AMPLITUDE t 11 1 1 00 MODULATION INDEX M = = 0.08 TO 0.14 A - B A + B Figure 8. Downlink: 8% to 14% Amplitude Modulation |
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