User's Manual

ISO transponder
8.1 Memory configuration of ISO the transponders
SIMATIC RF300
System Manual, 07/2016, C79000-G8976-C345-0x
253
Memory areas
Depending on the manufacturer of the transponder chip, the memory configuration of an ISO
transponder consists of varying sizes of user memory.
The typical sizes are 112 bytes, 256 bytes, 992 bytes EEPROM or 2000 bytes FRAM. Each
ISO transponder chip has an 8-byte long unique serial number (UID, read only). This UID is
transferred as an 8 byte value through a read command to address FFF0 with a length of 8.
OTP area
For the OTP area, a 16-byte address space is always reserved at the end of the memory
area. The blocks are divided up depending on the chip (see technical specifications). Note
that the corresponding addresses for the user data are therefore not available to the
application when the OTP area is used.
A total of 4 block addresses ("mapped" addresses) are provided:
● FF80
● FF84
● FF88
● FF8C
A write command to this block address with a valid length (4, 8, 12, 16 bytes depending on
the block address) protects the written data from subsequent overwriting.
Note
Exception Fujitsu chip (MDS D4xx and MDS D522)
The Fujitsu chip MB89R118 (MDS D4xx)
has 8-byte blocks, which means that only 2 block
addresses have to be addressed: FF80 and FF88 with the length 8 and 16 bytes).
The Fujitsu chip MB89R112 (MDS D5xx) has 32 byte blocks and can therefore not be
addressed in the OTP area.
Note
Restriction to the use of the OTP
Observe the following restrictions when using OTP:
•
The OTP write/lock command can only be sent in static operation.
•
The OTP write/lock command can not be sent as a chained command.
The Fujitsu chip MB89R112 (MDS D5xx) has 32 byte bl
ocks and can therefore not be
addressed in the OTP area.
Note
Use of the OTP area is not reversible
If you use the OPT area, you cannot undo it, because the OPT area can only be written to
once.