ATA555811C-DDB Atmel, ATA555811C-DDB Datasheet - Page 8

• Manufacturer Part Number: ATA555811C-DDB
• Description: IC IDIC 1KBIT R/W DIE
• Manufacturer: Atmel

Specifications of ATA555811C-DDB

• Function: Read/Write
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.7.3
8
ATA5558
Master Key
The Master Key controls various operating modes as described in
purposes, other Master Key codes are used, but once the Configuration block has been double
locked these test functions can never be reactivated.
If the Master Key is set to 0110, the blocks within the system memory section have different
access protection (see
by the Page Security Register. Access to password protected system memory blocks can only
be performed after the corresponding LoginWrite or LoginRead has been successfully executed.
The password blocks themselves are non-readable. Traceability and configuration can always be
read but the traceability data cannot be altered.
Table 2-2.
A new ATA5558 device, when received by the customer can be considered as being unpro-
grammed (all 0 state), the only exception to this being the preprogrammed non-alterable
traceability information. For the tag manufacturer to be able to easily set up the tag passwords, it
is possible to provisionally switch the password protection off. i.e Master Key = 0. In this state, it
is possible to read and write all non-locked (lock bits = 0) memory blocks irrespective of the
page security. In this way, new tag passwords or Tag ID’s can be defined and written. Blocks,
which have once been locked (block lock bit = 1) can however not be rewritten. When the cus-
tomer has completed the tag configuration, the Master Key is set to the “safe” state (= 6) thus
enabling the full password protection, and then finally the configuration block itself may be
locked. In this double locked condition, the configuration and all other locked blocks are irrevers-
ibly set and cannot be changed. This applies to both the user and the majority of the system
memory blocks.
Master Key
others
6
9
Master Key Related Functions
DDR
yes
yes
no
Figure 2-5 on page
yes
yes
PM
no
Enables
EAS
yes
yes
no
7). These access rights are fixed and not influenced
User Memory
Clear
yes
yes
no
Table
Security
Page
Protection Scheme
yes
yes
2-2. For production test
no
4681E–RFID–11/09
Memory
System
yes
yes
no