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ISO/IEC 14443 Type B-Compliant
1Kb Memory Fob
sets the upper nibble of Param 3 to 0000b, the Param 3
MSB
LSB
value to be used for the MAX66020 in the ATTRIB
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
request is 01h.
X
X
X
X
Param 4 assigns the slave the CID number that is used
RESPONSE DATA RESPONSE DATA
RATE (UPLINK) RATE (DOWNLINK)
RECEIVER FRAME SIZE CAPABILITY
with the block transmission protocol to address one of
several slaves in the ACTIVE state. Figure 27 shows the
Param 4 bit assignments. Since the MAX66020 sup-
Figure 26. Bit Assignments for Param 2 Byte
ports the CID field, the master can assign any number
in the range from 0 to 14. According to ISO/IEC 14443-
3, code 15 is reserved.
MSB
LSB
The ATTRIB request frame contains one optional field,
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
called higher layer information (HLINF). This field can
0
0
(FIXED)
0
0
CARD IDENTIFIER VALUE (CID)
be used to include data as in the information field of the
ISO/IEC 14443 Type B block transmission protocol (see
Figure 11). If such data is present and the slave sup-
Figure 27. Bit Assignments for Param 4 Byte
ports the HLINF field, then the slave processes the
HLINF data and returns the result in its response to the
ATTRIB request. Typically, the ATTRIB request is trans-
mitted without HLINF field. The only HLINF data that the
SOF
INDICATOR
MBLI, CID
HL RESPONSE
( ≥ 0 BYTES)
CRC
(2 BYTES)
EOF
MAX66020 accepts and processes is the Get UID com-
mand, code 30h.
If the ATTRIB request has a matching PUPI and a valid
Figure 28. ATTRIB Response Frame
CRC, the slave transmits an ATTRIB response frame, as
shown in Figure 28. The upper nibble of the indicator,
also referred to as MBLI, is 0000b, telling that the slave
FRAME WITHOUT CID
SOF COMMAND CRC
C2h (2 BYTES)
FRAME WITH CID
EOF
does not provide any information on its internal input
buffer size; the lower nibble returns the card identifier
value that the master has just assigned to the slave.
The HL response field is optional. There are three
cases to be distinguished:
SOF
COMMAND
CAh
CID
(1 BYTE)
CRC
(2 BYTES)
EOF
a) If there was no HLINF field in the ATTRIB request,
then there is no HL response field in the response.
b) If there was a Get UID command code (30h) in the
Figure 29. DESELECT Request and Response Frames
Param 2 informs the slave about the data rate that shall
be used for communication in the ACTIVE state and the
maximum frame size that the master can receive.
Figure 26 shows the bit assignments for the Param 2
byte. The MAX66020 supports the data rates of
105.9kbps (code 00b), 211.9kbps (code 01b),
423.75kbps (code 10b), and 847.5kbps (code 11b).
The master can choose different data rates for request
and response. Since it does not support chaining, the
MAX66020 ignores the frame size capability and
assumes that the master can receive frames as large
as specified in the ATQB response.
The lower nibble of Param 3 is used to confirm the pro-
tocol type as specified in the lower nibble of the second
byte of the ATQB protocol info. Since ISO/IEC 14443-3
HLINF field of the ATTRIB request, then the HL
response field is identical to the Get UID response
information field (i.e., 00h followed by the 8-byte UID).
c) If the code in the HLINF field of the ATTRIB request
was different from 30h, then the response frame does
not contain an HL response field.
DESELECT Command
The DESELECT command is used to transition the slave
from the ACTIVE to the HALT state after the master has
completed the communication with the slave. There are
two versions of the deselect request frame, one without
CID and one with CID. Figure 29 shows both versions.
Figure 27 shows the CID format.
Logically, the DESELECT command is a special case of
the S-block of the block transmission protocol, as
defined in part 4 of the ISO/IEC 14443 standard. The
MAX66020 responds to a DESELECT command if the
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