NLM0010 datasheet(13/35 Pages) INFINEON

13 / 35 page

The change of lock information must be executed as a “Read-Modify-Write” operation. Firstly the block must be

read, then all appropriate bits have to be changed, and finally the information should be written back to the

block. The write operation should be performed in a secure environment.

Note: Changing bits from ’0’ to ’1’ will lead to unexpected chip behavior and should not be performed. The

response to a write command including incorrect changed bits is not valid.

Example:

Assuming a NLM0011/ NLM0010 chip, which has not been configured in any way, the Lock Block (11H) contains

data 02 AA AA AAH (i.e. only block 0FH and UID are write protected).

To lock i.e. block 06H from being re-written, the following operations should be performed in a secure

environment. The command example includes the ISO Flags and the CRC:

•

Read content of block 11H with “Read single block” command

Command example for read single block 02 20 11 4F 51H

Response 00 AA AA AA 02 D4 BCH

Memory content of block 11H is 02 AA AA AAH

•

Modify bits [13:12] to 00B

Result is 02 AA 8A AAH

•

Write modified value to block 11H with “Write single block” command

Command example for write single block 02 21 11 AA 8A AA 02 1C F5H

Acknowledge Response 00 78 F0H

Memory content of block 11H is now 02 AA 8A AAH

After this sequence, block 06H is locked and cannot be changed anymore.

The Service Block 10H

Block 10H can only be written with the WriteByte command. Bits [31:24] and bits [23:20] are writable, the rest of

block 10H is read only.

Table 7

Service Block 10H

Bit Index

Abbreviation

Description

[31:24]

RFI

Reserved for Infineon

[23:22]

AFILOCK

These two bits are internally used to lock the AFI byte.

10BAFI byte is writable

00BAFI is locked

[21:20]

LOCK

These two bits are used to lock Byte 3 of page 10H.

10BByte 3 (bit(31:24)) are writable

00HByte 3 (bit(31:24)) bit are read only

[19:0]

Configuration Data Used by Infineon for chip configuration

AFI Block 0FH

Block 0FH holds the AFI Byte in bit [31:24]. This byte can only be written using the WriteAFI command. This block

is write only.

Note:Writing the AFI with the WriteAFI command should be performed in a secure environment.

NLM0011/ NLM0010 " NFC-PWM Series "

NFC Wireless Configuration IC with PWM Output

Memory Organization

Datasheet

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2019-05-31

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