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EN29GL256H Datasheet(PDF) 33 Page - Eon Silicon Solution Inc. |
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EN29GL256H Datasheet(HTML) 33 Page - Eon Silicon Solution Inc. |
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33 / 57 page  This Data Sheet may be revised by subsequent versions ©2004 Eon Silicon Solution, Inc., www.eonssi.com or modifications due to changes in technical specifications. 33 EN29GL256H/L Rev. G, Issue Date: 2011/01/17 Table 8. Secured Silicon Sector Addresses Secured Silicon Sector Address Range 000000h-000007h Reserve for Factory 000008h-00007Fh Determined by customer Customer Lockable Secured Silicon Sector The Customer Lockable Secured Silicon Sector is always shipped unprotected (DQ0 set to “1”), allowing customers to utilize that sector in any manner they choose. If the security feature is not required, the Secured Silicon Sector can be treated as an additional Flash memory space. Please note the following: • Once the Secured Silicon Sector area is protected, the Secured Silicon Sector Indicator Bit (DQ0) is permanently set to “0.” • The Secured Silicon Sector can be read any number of times, but can be programmed and locked only once. The Secured Silicon Sector lock must be used with caution as once locked, there is no procedure available for unlocking the Secured Silicon Sector area and none of the bits in the Secured Silicon Sector memory space can be modified in any way. • The accelerated programming (ACC) is not available when the Secured Silicon Sector is enabled. • Once the Secured Silicon Sector is locked and verified, the system must write the Exit Secured Silicon Sector Region command sequence which return the device to the memory array at sector 0. • The address 0h~7h in Secured Silicon Sector is reserved for Factory. Secured Silicon Sector Entry/Exit Command Sequences The system can access the Secured Silicon Sector region by issuing the three-cycle Enter Secured Silicon Sector command sequence. The device continues to access the Secured Silicon Sector region until the system issues the four-cycle Exit Secured Silicon Sector command sequence. The Secured Silicon Sector Entry Command allows the following commands to be executed • Read customer and factory Secured Silicon areas • Program the customer Secured Silicon Sector After the system has written the Enter Secured Silicon Sector command sequence, it may read the Secured Silicon Sector by using the addresses normally occupied by sector SA0 within the memory array. This mode of operation continues until the system issues the Exit Secured Silicon Sector command sequence, or until power is removed from the device. |
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