NTP53X2 datasheet(26/133 Pages) NXP

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NXP Semiconductors

NTP53x2

NTAG 5 link - NFC Forum-compliant I2C bridge

NTP53x2

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Product data sheet

Rev. 3.3 — 3 July 2020

COMPANY PUBLIC

544533

26 / 133

Table 24. NFC Key Privileges (KPx) location

Block Address

NFC

I2C

Byte 0

Byte 1

Byte 2

Byte 3

11h

1011h

NFC_KP0

RFU

13h

1013h

NFC_KP1

RFU

15h

1015h

NFC_KP2

RFU

17h

1017h

NFC_KP3

RFU

Table 25 shows the definition of the Key Privileges bytes KPx. The bits define the

privileges for the related key used with mutual authentication. If the related bit is set to

1b, the access for the dependent area/feature is granted after mutual authentication with

the related key.

Table 25. Definition of NFC Key Privileges bytes KPx

Bit Privilege

Description

Restricted AREA_1 Write

Write access to restricted user memory AREA_1

Restricted AREA_1 Read

Read access to restricted user memory AREA_1

Crypto Config

Preset of Authentication Limit

EAS/AFI

Access for write alike command for EAS and AFI as

following:

PROTECT EAS/AFI

SET EAS

RESET EAS

LOCK EAS

WRITE EAS ID

WRITE AFI

LOCK AFI

Destroy

Access to the DESTROY functionality

Privacy

Enable/disable of the PRIVACY mode

Write

Write access to protected user memory area

Read

Read access to protected user memory area

8.1.3.9 Keys and passwords

The keys or passwords are stored in the configuration memory. The usage of the

individual keys depends on the related Key Privileges.

The state of the keys (including read and write access with the READ CONFIG and

WRITE CONFIG commands) depends on the status of the related Key Header and the

status of the Global Crypto Header.

From I2C perspective, these blocks can be written if not locked by the I2C section lock.

Table below shows the location of the 128-bit AES Table 26 keys in the configuration

memory.

NOTE: AES keys are only available for NTP5332 in AES mode.

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