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AM29PDL128G80 データシート(PDF) 24 Page - SPANSION |
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AM29PDL128G80 データシート(HTML) 24 Page - SPANSION |
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24 / 69 page  July 29, 2002 Am29PDL128G 23 P R E L I M I NARY SECTOR PROTECTION The Am29PDL128G features several levels of sector protection, which can disable both the program and erase operations in certain sectors or sector groups: Persistent Sector Protection A command sector protection method that replaces the old 12 V controlled protection method. Password Sector Protection A highly sophisticated protection method that requires a password before changes to certain sectors or sec- tor groups are permitted WP# Hardware Protection A write protect pin that can prevent program or erase operations in sectors 0, 1, 268, and 269. 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 will be used. If the customer decides to con- tinue using the Persistent Sector Protection method, they must set the Persistent Sector Protection Mode Locking Bit. This will permanently set 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 will permanently set the part to operate only using password sector protection. It is important to remember that setting either the Per- sistent Sector Protection Mode Locking Bit or the Password Mode Locking Bit permanently selects the protection mode. It is not possible to switch be- tween the two methods once a locking bit has been set. It is important that one mode is explicitly se- lected 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 WP# Hardware Protection feature is always avail- able, independent of the software managed protection method chosen. The device is shipped with all sectors unprotected. AMD offers the option of programming and protecting sectors at the factory prior to shipping the device through AMD’s ExpressFlash™ Service. Contact an AMD representative for details. SGA66 1110 10 X X X X X SA239 to SA242 SGA67 1110 11 X X X X X SA243 to SA246 SGA68 1111 00 X X X X X SA247 to SA250 SGA69 1111 01 X X X X X SA251 to SA254 SGA70 1111 10 X X X X X SA255 to SA258 SGA71 1111 11 00 X X X SA259 to SA261 01 10 SGA72 1111 11110 00 SA262 SGA73 1111 11110 01 SA263 SGA74 1111 11110 10 SA264 SGA75 1111 11110 11 SA265 SGA76 1111 11111 00 SA266 SGA77 1111 11111 01 SA267 SGA78 1111 11111 10 SA268 SGA79 1111 11111 11 SA269 Table 8. Sector Block Addresses for Protection/Unprotection (Continued) Sector Group A21 A20 A19 A18 A17 A16 A15 A14 A13 A12 A11 Sectors |
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