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S29GL01GP Scheda tecnica(PDF) 46 Page - Cypress Semiconductor |
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S29GL01GP Scheda tecnica(HTML) 46 Page - Cypress Semiconductor |
46 / 82 page Document Number: 002-00886 Rev. *B Page 46 of 83 S29GL01GP S29GL512P S29GL256P S29GL128P 10.2 Customer Lockable Secured Silicon Sector The Customer Lockable Secured Silicon Sector is always shipped unprotected (DQ7 set to “0”), 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 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) and unlock bypass functions are 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. 10.3 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. See Command Definitions on page 64 [Secured Silicon Sector Command Table, Appendix Table on page 65 through Table on page 71 for address and data requirements for both command sequences. 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. Software Functions and Sample Code The following are C functions and source code examples of using the Secured Silicon Sector Entry, Program, and exit commands. Refer to the Cypress Low Level Driver User’s Guide (available soon on www.cypress.com) for general information on Cypress Flash memory software development guidelines. Note Base = Base Address. /* Example: SecSi Sector Entry Command */ *( (UINT16 *)base_addr + 0x555 ) = 0x00AA; /* write unlock cycle 1 */ *( (UINT16 *)base_addr + 0x2AA ) = 0x0055; /* write unlock cycle 2 */ *( (UINT16 *)base_addr + 0x555 ) = 0x0088; /* write Secsi Sector Entry Cmd */ Secured Silicon Sector Entry (LLD Function = lld_SecSiSectorEntryCmd) Cycle Operation Byte Address Word Address Data Unlock Cycle 1 Write Base + AAAh Base + 555h 00AAh Unlock Cycle 2 Write Base + 555h Base + 2AAh 0055h Entry Cycle Write Base + AAAh Base + 555h 0088h |
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