MF0AES2001DUD datasheet(49/72 Pages) NXP

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NXP Semiconductors

MF0AES(H)20

MIFARE Ultralight AES contactless limited-use IC

10.9 LOCK_SIG

The LOCK_SIG command allows the user to unlock, lock or permanently lock the dedicated originality signature

memory. The originality signature can only be unlocked, if the originality signature is not permanently locked.

There is no command to unlock the originality signature, if the originality signature is permanently locked. The

LOCK_SIG command is shown in Figure 19.

Table 51 shows the required timing.

aaa-022904

ACK

Cmd

TACK

TNAK

TimeOut

Time out

Arg

CRC

NAK

CMAC

CMAC CRC

NAK

FDTACK

FDT

TCMD

TACK

FDTACK

PICC ,,ACK''

PICC ,,NAK''

PCD

Figure 19. LOCK_SIG command

Name

Code

Description

Length

Cmd

ACh

lock signature

1 byte

locking action

1 byte

00h - unlock

1 byte

01h - lock

1 byte

Arg

02h - permanently lock

1 byte

[CMAC]

Optional: If secure messaging is enabled by set

of SEC_MSG_ACT

[8 bytes]

CRC

CRC according to [2]

2 bytes

Table 49. LOCK_SIG command

Name

Code

Description

Length

ACK

see Table 21

see Section 9.3

4 bits

[CMAC]

Optional: If secure messaging is enabled by

set of SEC_MSG_ACT. Note that the ACK is

replaced by a MAC, calculated over just the

CmdCtr, and CRC calculated over the MAC

bytes.

[8 bytes]

[CRC]

CRC according to [2]

[2 bytes]

Table 50. LOCK_SIG response

MF0AES_H_20

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Product data sheet

Rev. 3.2 — 28 March 2023

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