MAX66040K-000AA+【PDF 19/25 页】ISO CARD SECURE MEMORY

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ABRIDGED DATA SHEET

ISO/IEC 14443 Type B-Compliant

Secure Memory

1ST BYTE

BIT RATE CABILITY

77h

2ND BYTE

MAXIMUM FRAME SIZE, PROTOCOL TYPE

21h

3RD BYTE,

UPPER NIBBLE

FWI

0111b

3RD BYTE,

BIT 4, BIT 3

ADC

00b

3RD BYTE,

BIT 2, BIT 1

FO

01b

Figure 22. Protocol Info Field Details

SOF

COMMAND

PUPI

CRC

EOF

SOF

INDICATOR

CRC

EOF

50h

(4 BYTES)

(2 BYTES)

00h

(2 BYTES)

Figure 23. HLTB Request Frame

shows where this information is located in the protocol

info field and what the values are.

The bit-rate capability of the MAX66040 ranges from

105.9kbps to 847.5kbps in both directions (request and

response); request and response bit rate need not be

the same. The maximum frame size (upper nibble of the

2nd byte) of any request/response specifies 32 bytes.

The largest frame that occurs with the MAX66040 is 26

bytes (copy buffer request, compute page MAC

response). The protocol type (lower nibble of the 2nd

byte) specifies that the MAX66040 supports the

ISO/IEC 14443-4 block transmission protocol. The FWI

code 0111b specifies a frame waiting time of 38.7ms,

which is long enough to generate a computed secret.

Note that a slave may respond long before the maxi-

mum frame waiting time is expired. The ADC code 00b

specifies that the MAX66040 uses proprietary coding

for the application data field. The FO code 01b implies

that the MAX66040 supports CID, but does not support

the NAD field in the ISO/IEC 14443-4 block transmis-

sion protocol.

HLTB Command

The HLTB command is the only network function com-

mand to silence a slave by parking it in the HALT state.

If, based on the ATQB response, the master does not

want to further communicate with the slave, the master

issues the HLTB command. Figures 23 and 24 show

the format of the HLTB request frame and the corre-

sponding response frame. The data to be used in the

PUPI field must match the PUPI information that the

Figure 24. HLTB Response Frame

slave has transmitted in the ATQB response. While in

the HALT state, the slave only responds to the WUPB

request.

ATTRIB Command

The ATTRIB command is the only way to select a slave

and make it process commands that are transmitted

according to the ISO/IEC 14443 block transmission pro-

tocol. If, based on the ATQB response, the master

wants to communicate with the slave, the master must

put the slave into the ACTIVE state using the slave

selection command ATTRIB. The normal way for the

master to move a slave out of the ACTIVE state is by

sending a DESELECT command, which uses an

S-block to convey a network function command.

Figure 25 shows the format of the ATTRIB request

frame. The data to be used in the PUPI field must

match the PUPI information that the slave has transmit-

ted in the ATQB response. Param 1 tells the slave how

much time the master needs to switch from transmit to

receive (TR0), how much time the master needs to syn-

chronize to the slave’s subcarrier (TR1), and whether

the master is capable of receiving response frames

without SOF and/or EOF.

The MAX66040 ignores the data of Param 1. To ease

requirements for ISO/IEC 14443 Type B readers, the

MAX66040 has TR0 and TR1 fixed at 128/fs (151μs; fs

is the subcarrier frequency of 847.5kHz) and always

begins and ends its responses with SOF and EOF,

respectively.

SOF

COMMAND

PUPI

PARAM 1

PARAM 2

PARAM 3

PARAM 4

HLINF

CRC

EOF

1Dh

(4 BYTES)

(1 BYTE)

(1 BYTE)

01h

(1 BYTE)

( ≥ 0 BYTES) (2 BYTES)

Figure 25. ATTRIB Request Frame

28

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