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ISO/IEC 14443 Type B-Compliant
1Kb Memory Fob
DATA*
1
0
1
TRANSMISSION OF A SINGLE BIT
SHOWN AS EIGHT CYCLES OF THE 847kHz SUBCARRIER
*DEPENDING ON THE INITIAL PHASE, THE DATA POLARITY MAY BE INVERSE.
Figure 10. Uplink: Load Modulation of the RF Field by the BPSK Modulated Subcarrier
ISO/IEC 14443 Block
Transmission Protocol
Before the master can send a data packet to access the
memory, the MAX66020 must be in the ACTIVE state.
The protocol to put the MAX66020 into the ACTIVE state
is explained in the Network Function Commands sec-
tion. While in the ACTIVE state, the communication
between the master and the MAX66020 follows the
block transmission protocol as specified in Section 7 of
ISO/IEC 14443-4. Such a block (Figure 11) consists of
three parts: the prologue field, the information field, and
the epilogue field. The prologue can contain up to 3
bytes, called the protocol control byte (PCB), card iden-
tifier (CID), and the node address (NAD). Epilogue is
another name for the 16-bit CRC that precedes the EOF.
The information field is the general location for data.
Block Types
The standard defines three types of blocks: I-block,
R-block, and S-block. Figures 12, 13, and 14 show the
applicable PCB bit assignments.
The I-block is the main tool to access the memory. For
I-blocks, bit 2 must be 1 and bit 6, bit 7, and bit 8 must
be 0. Bit 5, marked as CH, is used to indicate chaining,
a function that is not used or supported by the
MAX66020. Therefore, bit 5 must always be 0. Bit 4,
marked as CID, is used by the master to indicate
whether the prologue field contains a CID byte. The
MAX66020 processes blocks with and without CID as
defined in the standard. The master must include the
CID byte if bit 4 is 1. Bit 3, marked as NAD, is used to
indicate whether the prologue field contains an NAD
byte, a feature not supported by the MAX66020.
Therefore, bit 3 must always be 0. Bit 1, marked as #, is
PROLOGUE FIELD
INFORMATION FIELD
EPILOGUE FIELD
PCB
1 BYTE
CID
1 BYTE
NAD
1 BYTE
(DATA)
0 OR MORE BYTES
CRC
(LSB)
1 BYTE
CRC
(MSB)
1 BYTE
Figure 11. ISO/IEC 14443-4 Type B Block Format
MSb
LSb
MSb
LSb
BIT 8
0
BIT 7
0
BIT 6
0
BIT 5
CH
BIT 4
CID
BIT 3
NAD
BIT 2
1
BIT 1
#
BIT 8
1
BIT 7
0
BIT 6
1
BIT 5
AN
BIT 4
CID
BIT 3
0
BIT 2
1
BIT 1
#
Figure 12. Bit Assignments for I-Block PCB
Figure 13. Bit Assignments for R-Block PCB
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