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S29GL512N Datasheet(PDF) 35 Page - Cypress Semiconductor |
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S29GL512N Datasheet(HTML) 35 Page - Cypress Semiconductor |
35 / 92 page Document Number: 002-01522 Rev. *B Page 35 of 92 S29GL512N S29GL256N S29GL128N 7.10.2 Password Sector Protection A highly sophisticated protection method that requires a password before changes to certain sectors or sector groups are permitted 7.10.3 WP# Hardware Protection A write protect pin that can prevent program or erase operations in the outermost sectors. The WP# Hardware Protection feature is always available, independent of the software managed protection method chosen. 7.10.4 Selecting a Sector Protection Mode All parts default to operate in the Persistent Sector Protection mode. The customer must then choose if the Persistent or Password Protection method is most desirable. There are two one-time programmable non-volatile bits that define which sector protection method is used. If the customer decides to continue using the Persistent Sector Protection method, they must set the Persistent Sector Protection Mode Locking Bit . This permanently sets the part to operate only using Persistent Sector Protection. If the customer decides to use the password method, they must set the Password Mode Locking Bit. This permanently sets the part to operate only using password sector protection. It is important to remember that setting either the Persistent Sector Protection Mode Locking Bit or the Password Mode Locking Bit permanently selects the protection mode. It is not possible to switch between the two methods once a locking bit is set. It is important that one mode is explicitly selected when the device is first programmed, rather than relying on the default mode alone. This is so that it is not possible for a system program or virus to later set the Password Mode Locking Bit, which would cause an unexpected shift from the default Persistent Sector Protection Mode into the Password Protection Mode. The device is shipped with all sectors unprotected. The factory offers the option of programming and protecting sectors at the factory prior to shipping the device through the ExpressFlash™ Service. Contact your sales representative for details. It is possible to determine whether a sector is protected or unprotected. See Autoselect Command Sequence on page 44 for details. 7.11 Advanced Sector Protection Advanced Sector Protection features several levels of sector protection, which can disable both the program and erase operations in certain sectors. Persistent Sector Protection is a method that replaces the old 12V controlled protection method. Password Sector Protection is a highly sophisticated protection method that requires a password before changes to certain sectors are permitted. 7.12 Lock Register The Lock Register consists of 3 bits (DQ2, DQ1, and DQ0). These DQ2, DQ1, DQ0 bits of the Lock Register are programmable by the user. Users are not allowed to program both DQ2 and DQ1 bits of the Lock Register to the 00 state. If the user tries to program DQ2 and DQ1 bits of the Lock Register to the 00 state, the device aborts the Lock Register back to the default 11 state. The programming time of the Lock Register is same as the typical word programming time without utilizing the Write Buffer of the device. During a Lock Register programming sequence execution, the DQ6 Toggle Bit I toggles until the programming of the Lock Register has completed to indicate programming status. All Lock Register bits are readable to allow users to verify Lock Register statuses. The Customer Secured Silicon Sector Protection Bit is DQ0, Persistent Protection Mode Lock Bit is DQ1, and Password Protection Mode Lock Bit is DQ2 are accessible by all users. Each of these bits are non-volatile. DQ15-DQ3 are reserved and must be 1's when the user tries to program the DQ2, DQ1, and DQ0 bits of the Lock Register. The user is not required to program DQ2, DQ1 and DQ0 bits of the Lock Register at the same time. This allows users to lock the Secured Silicon Sector and then set the device either permanently into Password Protection Mode or Persistent Protection Mode and then lock the Secured Silicon Sector at separate instances and time frames. Secured Silicon Sector Protection allows the user to lock the Secured Silicon Sector area Persistent Protection Mode Lock Bit allows the user to set the device permanently to operate in the Persistent Protection Mode Password Protection Mode Lock Bit allows the user to set the device permanently to operate in the Password Protection Mode |
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Similar Description - S29GL512N |
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