User's Manual

ACG HF Multi ISO RFID Reader V1.0
ACG Identification Technologies GmbH 31
8 ICODE
ICODE® IC data is stored in a non-volatile EEPROM. Its capacity is 512 bits
organized in 16 blocks consisting 4 bytes each (1 block = 32 bits). First 3 blocks
contain administrative data.
8.1 Memory organization
Byte
Page
address
0 1 2 3
0Fh User data
… …
05h User data
04h Family code identifier / User data
03h Special function (EAS) / User data
02h
Write access condition
01h
Serial number
00h
Serial number
Figure 8-1: ICODE® memory organization
8.2 Serial number
The serial number of a label is defined at the manufacturer process. It is stored on
page 00h and page 01h. LSB is stored first.
8.3 Write access condition
Page 02h contains the write access condition for each page. Each page can be set to
read only (bits are set to 0). This procedure is irreversible. Locking page 2 no further
changed of the access condition can be done. Always two bits must be change at the
same time. This register is implemented as OTP.
Byte 0 Byte 1 Byte 2 Byte 3
MSB LSB MSB LSB MSB LSB MSB LSB
1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
3 2 1 0 7 6 5 4 B A 9 8 F E D C
Special
function
Write
access
Serial
number
Serial
number
User
data
… … … … … … … … … …
User
data
Figure 8-2: Write access condition bytes