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AM29DL322GT70WMF Datasheet(PDF) 23 Page - SPANSION |
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AM29DL322GT70WMF Datasheet(HTML) 23 Page - SPANSION |
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23 / 58 page  December 4, 2006 25686B10 Am29DL32xG 21 D A TA SH EE T Secured Silicon Sector Flash Memory Region The Secured Silicon Sector feature provides a 256-byte Flash memory region that enables perma- nent part identification through an Electronic Serial Number (ESN). The Secured Silicon Sector uses a Secured Silicon Sector Indicator Bit (DQ7) to indicate whether or not the Secured Silicon Sector is locked when shipped from the factory. This bit is permanently set at the factory and cannot be changed, which pre- vents cloning of a factory locked part. This ensures the security of the ESN once the product is shipped to the field. AMD offers the device with the Secured Silicon Sector either factory locked or customer lockable. The fac- tory-locked version is always protected when shipped from the factory, and has the Secured Silicon Sector Indicator Bit per manently set to a “1.” The cus- tomer-lockable version is shipped with the Secured Silicon Sector unprotected, allowing customers to uti- lize the that sector in any manner they choose. The customer-lockable version has the Secured Silicon Sector Indicator Bit permanently set to a “0.” Thus, the Secured Silicon Sector Indicator Bit prevents cus- tomer-lockable devices from being used to replace de- vices that are factory locked. The system accesses the Secured Silicon Sector through a command sequence (see “Enter Secured Silicon Sector/Exit Secured Silicon Sector Command Sequence”). After the system has written the Enter Secured Silicon Sector command sequence, it may read the Secured Silicon Sector by using the ad- dresses normally occupied by the boot sectors. This mode of operation continues until the system issues the Exit Secured Silicon Sector command sequence, or until power is removed from the device. On power-up, or following a hardware reset, the device re- verts to sending commands to the boot sectors. Factory Locked: Secured Silicon Sector Programmed and Protected At the Factory In a factory locked device, the Secured Silicon Sector is protected when the device is shipped from the fac- tory. The Secured Silicon Sector cannot be modified in any way. The device is available preprogrammed with one of the following: ■ A random, secure ESN only ■ Customer code through the ExpressFlash service ■ Both a random, secure ESN and customer code through the ExpressFlash service. In devices that have an ESN, a Bottom Boot device will ha v e th e 1 6 - b yte ESN at ad dre sse s 00 00 00 h–0 00 00 7h in wor d m ode (or 000000h–00000Fh in byte mode). In the Top Boot de- vice the ESN wil l be at addresses 1FF000h–1FF007Fh in word mode (or addresses 3FE000h–3FE0FFh in byte mode). Customers may opt to have their code programmed by AMD through the AMD ExpressFlash service. AMD programs the customer’s code, with or without the ran- dom ESN. The devices are then shipped from AMD’s factory with the Secured Silicon Sector permanently locked. Contact an AMD representative for details on using AMD’s ExpressFlash service. Customer Lockable: Secured Silicon Sector NOT Programmed or Protected At the Factory If the security feature is not required, the Secured Sili- con Sector can be treated as an additional 256-byte Flash memory space, expanding the size of the avail- able Flash array. Additionally, note the difference in the location of the ESN compared to previous Am29DL32x top boot factory locked devices. The Secured Silicon Sector is one-time programmable, may not be erased, and can be locked only once. Note that the accelerated programming (ACC) and unlock bypass functions are not available when programming the Secured Silicon Sector. The Secured Silicon Sector area can be protected using one of the following procedures: ■ Write the three-cycle Enter Secured Silicon Sector Region command sequence, and then follow the in-system sector protect algorithm as shown in Fig- ure 2, except that RESET# may be at either V IH or V ID. This allows in-system protection of the Secured Silicon Sector without raising any device pin to a high voltage. Note that this method is only applica- ble to the Secured Silicon Sector. ■ Write the three-cycle Enter Secured Silicon Sector Region command sequence, and then use the alter- nate method of sector protection described in the “Sector/Sector Block Protection and Unprotection” section. The Secured Silicon Sector is one-time programma- ble. Once the Secured Silicon Sector is locked and verified, the system must write the Exit Secured Sili- con Sector Region command sequence to return to reading and writing the remainder of the array. The Secured Silicon Sector protection must be used with caution since, once protected, there is no proce- dure available for unprotecting the Secured Silicon Sector area and none of the bits in the Secured Silicon Sector memory space can be modified in any way. Hardware Data Protection The command sequence requirement of unlock cycles for programming or erasing provides data protection against inadvertent writes (refer to Table 14 for com- mand definitions). In addition, the following hardware |
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