sri4k STMicroelectronics, sri4k Datasheet - Page 18

• Manufacturer Part Number: sri4k
• Description: 13.56 Mhz Short-range Contactless Memory Chip With 4096-bit Eeprom And Anticollision Functions
• Manufacturer: STMicroelectronics

Memory mapping
4.4
18/49
Figure 17. EEPROM (addresses 7 to 127)
System area
This area is used to modify the settings of the SRI4K. It contains 3 registers:
OTP_Lock_Reg, Fixed Chip_ID and ST Reserved. See
A WRITE_BLOCK command in this area will not erase the previous contents. Selected bits
can thus be set from 1 to 0. All bits previously at 0 remain unchanged. Once all the 32 bits of
a block are at 0, the block is empty and cannot be updated any more.
Figure 18. System area
Block
Address
255
Block
Address
127
10
11
12
13
14
15
16
7
8
9
...
MSb
OTP_Lock_Reg
b31
MSb
b31
b24 b23
b24 b23
ST Reserved
32-bit Block
b16 b15
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
User Area
32-bit Block
b16 b15
b8 b7
Figure 18
Fixed Chip_ID
b8 b7
(Option)
LSb
b0
for a map of this area.
LSb
b0
Description
OTP
Description
Lockable
EEPROM
EEPROM
ai07663
Ai07661B
SRI4K