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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LRIS2K 데이터시트(PDF) 15 Page - STMicroelectronics |
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LRIS2K 데이터시트(HTML) 15 Page - STMicroelectronics |
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15 / 98 page  LRIS2K LRIS2K block security Doc ID 13888 Rev 9 15/98 2 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 0 7 8 15 16 23 24 31 Protect status 0 User area 5 bits 1 User area 5 bits ... User area 5 bits Table 4. Protect status area organization b7 b6 b5 b4 b3 b2 b1 b0 0 0 0 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 b0 b2, b1 b4, b3 0 00 00 Not applicable READ WRITE the block is not protected 1 11 01 READ NO WRITE NO READ NO WRITE the block is protected by password 1 1 11 10 READ NO WRITE NO READ NO WRITE the block is protected by password 2 1 11 11 READ NO WRITE NO READ NO WRITE the block is protected by password 3 1 00 00 Not applicable READ NO WRITE the block is not protected by a password |
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