LRIS64K datasheet(15/100 Pages) STMICROELECTRONICS

15 / 100 page

LRIS64K

System memory area

Doc ID 15336 Rev 11

15/100

System memory area

3.1

LRIS64K RF block security

The LRIS64K provides a special protection mechanism based on passwords. Each memory

sector of the LRIS64K can be individually protected by one out of three available passwords,

and each sector can also have Read/Write access conditions set.

Each memory sector of the LRIS64K is assigned with a Sector security status byte including

a Sector Lock bit, two Password Control bits and two Read/Write protection bits as shown in

Table 4. Table 3 describes the organization of the Sector security status byte which can be

read using the Read Single Block and Read Multiple Block commands with the Option_flag

set to ‘1’.

On delivery, the default value of the SSS bytes is reset to 00h.

Table 3.

Sector security status byte area

RF address

Bits [31:24]

Bits [23:16]

Bits [15:8]

Bits [7:0]

SSS 3

SSS 2

SSS 1

SSS 0

128

SSS 7

SSS 6

SSS 5

SSS 4

256

SSS 11

SSS 10

SSS 9

SSS 8

384

SSS 15

SSS 14

SSS 13

SSS 12

512

SSS 19

SSS 18

SSS 17

SSS 16

640

SSS 23

SSS 22

SSS 21

SSS 20

768

SSS 27

SSS 26

SSS 25

SSS 24

896

SSS 31

SSS 30

SSS 29

SSS 28

1024

SSS 35

SSS 34

SSS 33

SSS 32

1152

SSS 39

SSS 38

SSS 37

SSS 36

1280

SSS 43

SSS 42

SSS 41

SSS 40

1408

SSS 47

SSS 46

SSS 45

SSS 44

1536

SSS 51

SSS 50

SSS 49

SSS 48

1664

SSS 55

SSS 54

SSS 53

SSS 52

1792

SSS 59

SSS 58

SSS 57

SSS 56

1920

SSS 63

SSS 62

SSS 61

SSS 60

Table 4.

Sector security status byte organization

Password Control bits

Read / Write protection

bits

Sector

Lock

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