ib technology

14

Note that Mifare Ultralight cards DO NOT USE Security Keys or CRYPTO Authentication

and the memory is organised differently as groups of 4 bytes (Pages). Only one Page of 4

bytes can be written at a time so to maintain compatibility and a simple RWD host command

set, the same command as above is used to write data to Ultralight cards. The command and

arguments have the same structure but different meanings. The “Block” address is treated as a

“Page Address” and the KeyType/Key number parameter is a dummy 0x00 byte. In addition

the 4 bytes of data are padded out to 16 bytes with dummy 0x00 bytes.

B7

B0

Command:

0 1 0 1 0 1 1 1

(Ascii “W”, 0x57)

Argument1:

x x x x N N N N

(N = UL Card Page Address 0 – 15)

Argument2:

0 0 0 0 0 0 0 0

(Dummy byte, 0x00)

Argument3:

D D D D D D D D

(D = LS Byte of data to write to UL card)

Argument4:

D D D D D D D D

Argument5:

D D D D D D D D

Argument6:

D D D D D D D D

(D = MS Byte of data to write to UL card)

Argument7 – Argument18

0 0 0 0 0 0 0 0

12 Dummy padding bytes, 0x00

Acknowledge:

1 F F F F F F X

(F = Status flags)

Read Card Block

Command to read 16 bytes of data from specified Mifare block. The first argument is the

block number to read data from, the second argument specifies which key code (0 - 31 from

the internal storage area) to use for sector authentication/unlocking and if the Security Key is

to be used as a KeyA or KeyB type code. If the read was successful, indicated by

acknowledge status flags then sixteen bytes of block data follow.

B7

B0

Command:

0 1 0 1 0 0 1 0

(Ascii “R”, 0x52)

Argument1:

N N N N N N N N

(N = MF Card 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)

Acknowledge:

1 F F F F F F X

(F = Status flags)

Data only follows if Read was successful

Reply1:

D D D D D D D D

(D = LS Byte of data Read from card)

Reply2:

D D D D D D D D

Reply3:

D D D D D D D D

Reply4:

D D D D D D D D

16 Bytes of data

Reply13:

D D D D D D D D

Reply14:

D D D D D D D D

Reply15:

D D D D D D D D

Reply16:

D D D D D D D D

(D = MS Byte of data Read from card)