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M58BW032DT Datasheet(PDF) 10 Page - STMicroelectronics |
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M58BW032DT Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 60 page  M58BW032BT, M58BW032BB, M58BW032DT, M58BW032DB 10/60 Block Protection The M58BW032B features four different levels of block protection. The M58BW032D has the same block protection with the exception of the Tuning Block Protection, which is disabled in the factory. ■ Write Protect Pin, WP, - When WP is Low, VIL, the protection status that has been configured in the Block Protection Configuration Register is activated. The Block Protection Configuration Register is volatile. Any combination of blocks is possible. Any attempt to program or erase a protected block will be ignored and will return an error in the Status Register (see Table 11., Status Register Bits). ■ Reset/Power-Down Pin, RP, - If the device is held in reset mode (RP at VIL), no program or erase operations can be performed on any block. ■ Program/Erase Enable, VPEN, - VPEN protects all blocks preventing Program and Erase operations from affecting their data. Program/Erase Enable must be kept High (VIH) during all Program/Erase Controller operations, otherwise the operations is not guaranteed to succeed and data may become corrupt. ■ Tuning Block Protection - M58BW032B features a 64 bit password protection for program and erase operations for a fixed number of blocks After power-up or reset the device is tuning protected. An Unlock command is provided to allow program or erase operations in all the blocks. After a device reset the first two kinds of block pro- tection (WP, RP) can be combined to give a flexi- ble block protection. They do not affect the Tuning Block Protection. When the two protections are disabled, WP and RP at VIH, the blocks locked by the Tuning Block Protection cannot be modified. All blocks are protected at power-up. Tuning Block Protection The Tuning Block Protection is a software feature to protect blocks from program or erase opera- tions. It allows the user to lock program and erase operations with a user definable 64 bit code. It is only available on the M58BW032B version. The code is written once in the Tuning Protection Register and cannot be erased. When shipped the flash memory will have the Tuning Protection Code bits set to ‘1'. The user can program a ‘0’ in any of the 64 positions. Once programmed it is not possible to reset a bit to ‘1’ as the cells cannot be erased. The Tuning Protection Register can be programmed at any moment (after providing the correct code), however once all bits are set to ‘0’ the Tuning Protection Code can no longer be al- tered. The Tuning Protection Code locks the program and erase operations of all the blocks except for blocks 12 and 13 for the bottom configuration, and blocks 60 and 61 for the top configuration. The tuning blocks are "locked" if the tuning protec- tion code has not been provided, and “unlocked" once the correct code has been provided. The tun- ing blocks are locked after reset or power-up. The tuning protection status can be monitored in the Status Register. Refer to the Status Register sec- tion. Refer to the Command Interface section for the Tuning Protection Block Unlock and Tuning Pro- tection Program commands. See Appendix A, Fig- ure 24, 25 and 26 for suggested flowcharts for using the Tuning Block Protection commands. |
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