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LRIS2K 数据表(PDF) 16 Page - STMicroelectronics |
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LRIS2K 数据表(HTML) 16 Page - STMicroelectronics |
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16 / 102 page  LRIS2K block security LRIS2K 16/102 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 5 describes the organization of the Protect status area which can be read using the Read Single Block and Read Multiple Block commands with the Option_flag set to ‘1’. 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 these two bits is used to link a password to the block as defined in Table 6. Table 3. Memory block with protection 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 Block Lock b2, b1 Block access when password presented Block access when password not presented 0 xx READ WRITE READ WRITE 1 00 READ WRITE READ NO WRITE 1 01 READ WRITE READ WRITE 1 10 READ WRITE NO READ NO WRITE 1 11 READ NO WRITE NO READ NO WRITE Table 6. Password Control bits b4, b3 Password 00 The block is not protected by a Password 01 The block is protected by the Password 1 10 The block is protected by the Password 2 11 The block is protected by the Password 3 |
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