Datenblatt-Suchmaschine für elektronische Bauteile |
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ES29DS800FB-70WCI Datenblatt(PDF) 10 Page - Excel Semiconductor Inc. |
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ES29DS800FB-70WCI Datenblatt(HTML) 10 Page - Excel Semiconductor Inc. |
10 / 58 page ES I ES I 10 Rev. 0A May 25, 2006 ES29LV320E Excel Semiconductor inc. SECURITY SECTOR The security sector of the ES29LV320 device pro- vides an extra flash memory space that enables permanent part identification through an Electronic Serial Number (ESN). The security sector uses a security lock-Indicator Bit (DQ7) to indicate whether or not the security 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. Note that the ES29LV320 has a security sector size of 256 bytes. Security Lock-Indicator Bit (DQ7) In the device, the security sector can be provided in either factory locked version or customer lockable version. The factory-locked version is always pro- tected when shipped from the factory, and has the security lock-Indicator Bit permanently set to a “1”. The customer-lockable version is shipped with the security sector unprotected, allowing customers to utilize the sector in any manner they choose. The customer-lockable version has the security lock- Indicator Bit permanently set to a “0”. Thus, the security lock-Indicator Bit prevents customer-lock- able devices from being used to replace devices that are factory locked. Access to the Security Sector The security sector can be accessed through a command sequence: Enter security and Exit security sector commands. After the system has written the Enter security sector command sequence, it may read the security sector by using the addresses normally occupied by the boot sec- tors. This mode of operation continues until the sys- tem issues the Exit security sector command sequence, or until power is removed from the device. On power-up, or following a hardware reset, the device returns to read mode in which the nor- mal boot sectors can be accessed, instead of the security sector. Factory-Locked Device In a factory-locked device, the security sector is protected when the device is shipped from the fac- tory. The security sector cannot be modified in any way. The device is available preprogrammed with one of the following: - A random, secure ESN (16 bytes ) only - Customer code through the ESI’s Special-Code service - Both a random, secure ESN and customer code through the ESI’s Special-Code service. ESN ( Electronic Serial Number ) In devices that have an ESN, a Bottom Boot device will have the 16-byte (8-word) ESN in sector 0 at addresses 000000h-00000Fh in byte mode (or 000000h-000007h in word mode). In the Top Boot device the ESN will be in sector 70 at addresses 3FFF00h-3FFF0Fh in byte mode (or 1FFF80h- 1FFF87h in word mode). Note that in upcoming top boot versions of this device, the ESN will be located in sector 70 at addresses 3FFF00h-3FFF0Fh in byte mode (or 1FFF80h-1FFF87h in word mode). ESI’s Special-Code Service Customers may opt to have their code programmed by ESI through the ESI’s Special-Code service. ESI programs the customer’s code, with or without the random ESN. The devices are then shipped from ESI’s factory with the Security Sector permanently locked. Contact an ESI representative for details on using ESI’s Special-Code service. Customer-Lockable Device The customer lockable version allows the security sector to be freely programmed or erased and then permanently locked. Note that the ES29LV320 has a security sector size of 256 bytes (128 words). Note that the accelerated programming (ACC) and unlock bypass functions are not available when program- ming the security sector. Protection of the Security Sector The security sector area can be protected using the following procedures: Write the three-cycle “Enter security sector command” sequence, and then fol- lowing the in-system sector protect algorithm as shown in Fig. 2, except that RESET# may be at either VIH or VID. This allows In-system protection of the security sector without raising any device pin to a high voltage. Note that this method is only appli- cable to the security sector. To verify the protect/ unprotect status of the security sector. follow the algorithm shown in Fig. 2. |
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Ähnliche Beschreibung - ES29DS800FB-70WCI |
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