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S29GL016A90BFIR12 Datasheet(PDF) 39 Page - SPANSION |
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S29GL016A90BFIR12 Datasheet(HTML) 39 Page - SPANSION |
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39 / 89 page  April 22, 2005 S29GL-A_00_A3 S29GL-A MirrorBit™ Flash Family 37 Ad vance Info rmat i o n Secured Silicon Sector Flash Memory Region The Secured Silicon Sector feature provides a Flash memory region that enables permanent part identification through an Electronic Serial Number (ESN). The Secured Silicon Sector is 256 bytes in length, and 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 prevents cloning of a factory locked part. This en- sures the security of the ESN once the product is shipped to the field. The factory offers the device with the Secured Silicon Sector either customer lockable (standard shipping option) or factory locked (contact a Spansion sales representative for ordering information). The customer-lockable version is shipped with the Secured Silicon Sector unprotected, allowing customers to pro- gram the sector after receiving the device. The customer-lockable version also contains the Secured Silicon Sector Indicator Bit permanently set to a 0. The fac- tory-locked version is always protected when shipped from the factory, and has the Secured Silicon Sector Indicator Bit permanently set to a 1. Thus, the Se- cured Silicon Sector Indicator Bit prevents customer-lockable devices from being used to replace devices that are factory locked. Note that the ACC function and unlock bypass modes are not available when the Secured Silicon Sector is enabled. The Secured Silicon sector address space in this device is allocated as follows: The system accesses the Secured Silicon Sector through a command sequence (see Write Protect (WP#) on page 38). After the system writes the Enter Se- cured Silicon Sector command sequence, it may read the Secured Silicon Sector by using the addresses normally occupied by the first sector (SA0). 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 reverts to sending commands to sector SA0. Customer Lockable: Secured Silicon Sector NOT Programmed or Protected At the Factory Unless otherwise specified, the device is shipped such that the customer may program and protect the 256-byte Secured Silicon sector. The system may program the Secured Silicon Sector using the write-buffer, ac- celerated and/or unlock bypass methods, in addition to the standard programming command sequence. See Command Definitions on page 43. Programming and protecting the Secured Silicon Sector must be used with cau- tion since, once protected, there is no procedure 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. The Secured Silicon Sector area can be protected using one of the following procedures: Secured Silicon Sector Address Range x16 x8 Standard Factory Locked ExpressFlash Factory Locked Customer Lockable 000000h–000007h 000000h-00000Fh ESN ESN or determined by customer Determined by customer 000008h–00007Fh 000010h-0000FFh Unavailable Determined by customer |
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