ib technology

17

The first argument is the source block address to load data from, the second argument

specifies which key code to use for sector authentication (0-31) and if it is a KeyA or KeyB

code. The third argument specifies where the data is stored.

B7

B0

Command:

0 1 0 1 0 1 0 0

(Ascii “T”, 0x54)

Argument1:

N N N N N N N N

(N = MF source block address 0 – 255)

Argument2:

T x x K K K K K

(T = Key Type, 0 = KeyA, 1= KeyB)

(K = Key code number, 0 – 31)

Argument3:

N N N N N N N N

(N = MF destination block address 0 – 255)

Acknowledge:

1 F F F F F F X

(F = Status flags)

If the Inc, Dec or Transfer function was unsuccessful (invalid card, card out of field,

authentication failed or data structures are incorrect) then Status flags in acknowledge byte

indicate error. Note that the value manipulation commands operate internally on the Mifare

card and no data is transferred back to the MicroRWD. Note also that Ultralight cards do not

support Value Data Structures or the Inc, Dec, Transfer commands.

Type Identification

Command to return the ATQA (Answer to Request, Type A) two-byte codes and the SAK

(Select Acknowledge) single-byte code after the complete UID has been acquired. As part of

the initial communication with the Mifare card (as defined by ISO 14443A specification), the

Mifare transponder responds to REQA (Request Command, Type A) with ATQA. The two-

byte ATQA contains information that allows particular transponder types to be indentified.

Following on from this the Mifare transponder responds to the SELECT (Select Command,

Type A) with SAK (Select Acknowledge, Type A). The SAK code is a single byte value that

contains further information about the type of transponder and the length of the UID. The

SAK value reported is the final value after all “cascade levels” and the complete UID has

been acquired.

NOTE THAT THIS COMMAND IS INCLUDED FOR DIAGNOSTIC PURPOSES TO

ALLOW THE USER TO DETERMINE THE EXACT TYPE OF MIFARE CARD

PRESENT IN THE FIELD, IF REQUIRED.

B7

B0

Command:

0 1 1 1 1 0 0 0

(Ascii “x”, 0x78)

Acknowledge:

1 F F F F F F X

(F = Status flags)

Data only follows if card was selected OK with no errors detected.

Reply1:

D D D D D D D D

ATQA - MSB

Reply2:

D D D D D D D D

ATQA - LSB

Reply3:

D D D D D D D D

SAK