LRIS2K_11 datasheet(15/98 Pages) STMICROELECTRONICS

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LRIS2K

LRIS2K block security

Doc ID 13888 Rev 9

15/98

LRIS2K block security

The LRIS2K provides a special protection mechanism based on passwords. Each memory

block of the LRIS2K can be individually protected by one out of three available passwords,

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

Each memory block of the LRIS2K is assigned with a Protect Status area including a Block

Lock bit, two Password Control bits and two Read/Write protection bits as shown in Table 4.

Table 4 describes the organization of the Protect status area which can be read using the

Read Single Block command with the Option_flag set to ‘1’, and the Get Multiple Block

Security status command.

When the Block Lock bit is set to ‘1’, for instance by issuing a Block Lock command, the 2

Read/Write protection bits (b1, b2) are used to set the Read/Write access of the block as

described in Table 5.

The next 2 bits of the Protect Status area (b3, b4) are the Password Control bits. The value

of these two bits is used to link a password to the block as defined in Table 5.

Combinations not described in Table 5 are reserved.

Table 3.

Memory blocks with protect status area

Add

7 8

15 16

Protect status

User area

5 bits

User area

5 bits

...

User area

5 bits

Table 4.

Protect status area organization

Password Control bits

Read / Write protection

bits

Block Lock

Table 5.

Read / Write protection bit setting and block protection status

Block lock

function

Password

Control bits

Block access when

password presented

Block access when

password not presented

Block protection status

b2, b1

b4, b3

Not applicable

READ

WRITE

the block is not protected

READ

NO WRITE

NO READ

NO WRITE

the block is protected by

password 1

READ

NO WRITE

NO READ

NO WRITE

the block is protected by

password 2

READ

NO WRITE

NO READ

NO WRITE

the block is protected by

password 3

Not applicable

READ

NO WRITE

the block is not protected

by a password

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