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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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S29GL01GP 데이터시트(PDF) 45 Page - Cypress Semiconductor |
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S29GL01GP 데이터시트(HTML) 45 Page - Cypress Semiconductor |
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45 / 82 page  Document Number: 002-00886 Rev. *B Page 45 of 83 S29GL01GP S29GL512P S29GL256P S29GL128P 10. Secured Silicon Sector Flash Memory Region The Secured Silicon Sector provides an extra Flash memory region that enables permanent part identification through an Electronic Serial Number (ESN). The Secured Silicon Sector is 128 words in length and all Secured Silicon reads outside of the 128-word address range returns invalid data. The Secured Silicon Sector Indicator Bit, DQ7, (at Autoselect address 03h) is used to indicate whether or not the Secured Silicon Sector is locked when shipped from the factory. Please note the following general conditions: On power-up, or following a hardware reset, the device reverts to sending commands to the normal address space. Reads outside of sector SA0 return memory array data. Sector SA0 is remapped from memory array to Secured Silicon Sector array. Once the Secured Silicon Sector Entry Command is issued, the Secured Silicon Sector Exit command must be issued to exit Secured Silicon Sector Mode. The Secured Silicon Sector is not accessible when the device is executing an Embedded Program or Embedded Erase algorithm. The ACC function and unlock bypass modes are not available when the Secured Silicon Sector is enabled. 10.1 Factory Locked Secured Silicon Sector The Factory Locked Secured Silicon Sector is always protected when shipped from the factory and has the Secured Silicon Sector Indicator Bit (DQ7) permanently set to a “1”. This prevents cloning of a factory locked part and ensures the security of the ESN and customer code once the product is shipped to the field. These devices are available pre-programmed with one of the following: A random, 8 Word secure ESN only within the Secured Silicon Sector (at addresses 000000H - 000007H) Both a random, secure ESN and customer code through the Cypress programming service. Customers may opt to have their code programmed through the Cypress programming services. Cypress programs the customer's code, with or without the random ESN. The devices are then shipped from the Cypress factory with the Secured Silicon Sector permanently locked. Contact your local representative for details on using Cypress programming services. Secured Silicon Sector Addresses Secured Silicon Sector Address Range Customer Lockable ESN Factory Locked ExpressFlash Factory Locked 000000h–000007h Determined by customer ESN ESN or determined by customer 000008h–00007Fh Unavailable Determined by customer |
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