User's Manual

ACG HF Multi ISO RFID Reader V1.0
ACG Identification Technologies GmbH 29
7.3 my-d™ IC (SRF55VxxP)
my-d™ ICs are specific ICs from Infineon. These labels show a different memory
organization. Two different modes of tags are supported: plain and secure mode.
Two different cards with 320 bytes or 1k bytes EEPROM memory are available. The
EEPROM memory is divided into pages.
Each tag is split into two parts: The administrative blocks (00h, 01h, 02h) and the
user area. Administrative pages are read only and cannot be changed. User data is
free for use. Additionally user data pages can be locked. This procedure is
irreversible.
The EEPROM of SRF55V10P is organized in 128 pages addressed 00h to 7Fh. The
EEPROM of SRF55V02P consists of 32 pages addressed 00h to 1Fh.
Byte number within a page
Address
0 1 2 3 4 5 6 7
7Fh User data
… …
1Fh User data
… …
03h User data
02h
01h
00h
Serial number (UID)
SRF55V02P
SRF55V10P
Figure 7-4: SRF55VxxP memory organization
7.3.1 UID
The UID of SRF55Vxx labels starts with 60h or E0h.
7.3.2 Security Bit
Bit 45 of the UID defines the secure mode of the SRF55Vxx. If set the tag supports
security algorithm.
Bit 45 Description
1 Tag supports crypto security mechanism
0 Chip supports plain mode only
Figure 7-5: Security bit