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AM29LV641G 데이터시트(PDF) 22 Page - SPANSION |
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22 / 55 page  23 Am29LV641G June 14, 2005 ADV ANCE I N FO RMAT I O N SecSi ™ (Secured Silicon) Sector Flash Memory Region The SecSi (Secured Silicon) Sector feature provides a Flash memory region that enables permanent part identification through an Electronic Serial Number (ESN). The SecSi Sector is 128 words in length, and uses a SecSi Sector Indicator Bit (DQ7) to indicate whether or not the SecSi 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 ensures the secu- rity of the ESN once the product is shipped to the field. AMD offers the device with the SecSi Sector either fa ct o r y lo cke d o r cu sto m e r lo ck a ble. Th e fa c- tory-locked version is always protected when shipped from the factory, and has the SecSi (Secured Silicon) Sector Indicator Bit permanently set to a “1.” The cus- tomer-lockable version is shipped with the SecSi Sec- tor unprotected, allowing customers to utilize that sector in any manner they choose. The customer-lock- able version also has the SecSi Sector Indicator Bit permanently set to a “0.” Thus, the SecSi Sector Indi- cator Bit prevents customer-lockable devices from being used to replace devices that are factory locked. The SecSi sector address space in this device is allo- cated as follows: *All Uniform Devices (not including Uniform High) such as Am29LV640GU has its Sector starting at address 0. The system accesses the SecSi Sector through a command sequence (see “Enter SecSi Sector/Exit SecSi Sector Command Sequence”). After the system has written the Enter SecSi Sector command se- quence, it may read the SecSi Sector by using the ad- dresses normally occupied by the first sector (SA0). This mode of operation continues until the system is- sues the Exit SecSi 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. Factory Locked: SecSi Sector Programmed and Protected At the Factory In devices with an ESN, the SecSi Sector is protected when the device is shipped from the factory. The SecSi Sector cannot be modified in any way. A factory locked device has an 8-word random ESN at addresses 000000h–000007h. Customers may opt to have their code programmed by AMD through the AMD ExpressFlash service. The de- vices are then shipped from AMD’s factory with the SecSi Sector permanently locked. Contact an AMD representative for details on using AMD’s Express- Flash service. Customer Lockable: SecSi Sector NOT Programmed or Protected At the Factory As an alternative to the factory-locked version, the de- vice may be ordered such that the customer may pro- g ram a nd pro t e c t th e 1 28-wo rd S e c S i s e c t o r. Programming and protecting the SecSi Sector must be used with caution since, once protected, there is no procedure available for unprotecting the SecSi Sector area and none of the bits in the SecSi Sector memory space can be modified in any way. The SecSi Sector area can be protected using one of the following procedures: ■ Write the three-cycle Enter SecSi Sector Region command sequence, and then follow the in-system sector protect algorithm as shown in Figure 2, ex- cept that RESET# may be at either V IH or VID. This allows in-system protection of the SecSi Sector without raising any device pin to a high voltage. Note that this method is only applicable to the SecSi Sector. ■ Write the three-cycle Enter SecSi Sector Region command sequence, and then use the alternate method of sector protection described in the “Sector Group Protection and Unprotection” section. Once the SecSi Sector is programmed, locked and verified, the system must write the Exit SecSi Sector Region command sequence to return to reading and writing within the remainder of the array. Table 5. SecSi Sector Contents SecSi Sector Address Range Standard Factory Locked ExpressFlash Factory Locked Customer Lockable 000000h–000007h ESN ESN or determined by customer Determined by customer 000008h–00007Fh Unavailable Determined by customer |
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