Standardisation - RFID: Fundamentals and Applications in Contactless Smart Cards and Identification - page 243

Table 9.10 The application family identifier (AFI) facilitates the preselection from a group of
applications in the REQB command

AFI bit 7-bit 4
Application group

AFI bit 3-bit 0
Subgroup

Comment

0000 0000 All application groups and subgroups

— 0000 All subgroups of an application group

'X' 'Y' Only subgroup Y of application group X

0001 — Transport (local transport, airlines, ... )

0010 — Payments (banks, tickets, ... )

0011 — Identification (passport, driving licence)

0100 — Telecommunication (telephone card, GSM, ... )

0101 — Medicine (health insurance card, ... )

0110 — Multimedia (internet service, Pay-TV)

0111 — Games (casino card, lotto card)

1000 — Data storage ('portable files', ... )

1001-1111 — Reserved for future applications

Table 9.11 The number of available slots can be set by the parameter
M in the REQB command

Para M byte (bit 2-bit 0) Number of slots N

000 1

001 2

010 4

011 8

100 16

101 Reserved for future applications

11x Reserved for future applications

Apf AFI PARAM CRC

1 Byte 1 Byte 1 Byte 2 Bytes

Figure 9.21 Structure of an REQB command. In order to reliably rule out errors the anticolli-
sion prefix (Apf) possess a reserved value (05h), which may not be used in the NAD parameter
of a different command

Parameters of the contactless interface are encoded within the 'Protocol Info' param-
eter, for example the maximum possible baud rate of the smart card, the maximum
frame size, 6 or information on alternative protocols. The 'Application Data' parame-
ter can, moreover, include information on several applications available on the card
(multi-application card).

6 The maximum frame size that a card can process is determined by the size of the available reception
buffer in the RAM memory of the microprocessor. Particularly in low cost applications, the size of the
RAM memory can be very skimpily dimensioned.