參數(shù)資料
型號(hào)： S29GL256N10FFI010
廠商： SPANSION LLC
元件分類： PROM
英文描述： MirrorBit Flash Family
中文描述： 16M X 16 FLASH 3V PROM, 100 ns, PBGA64
封裝： 13 X 11 MM, LEAD FREE, FBGA-64
文件頁數(shù)： 39/95頁
文件大?。?/td> 3781K
代理商： S29GL256N10FFI010
44
S29GL-N
S29GL-N_00_B8 May 30, 2008
Da ta
Sh e e t
7.19.1
Customer Lockable: Secured Silicon Sector NOT Programmed or Protected
At the Factory
Unless otherwise specified, the device is shipped such that the customer may program and protect the 256-
byte Secured Silicon sector.
The system may program the Secured Silicon Sector using the write-buffer, accelerated and/or unlock
bypass methods, in addition to the standard programming command sequence. See Command Definitions
Programming and protecting the Secured Silicon Sector must be used with caution since, once protected,
there is no procedure available for unprotecting the Secured Silicon Sector area and none of the bits in the
Secured Silicon Sector memory space can be modified in any way.
The Secured Silicon Sector area can be protected using one of the following procedures:
Write the three-cycle Enter Secured Silicon Sector Region command.
To verify the protect/unprotect status of the Secured Silicon Sector, follow the algorithm.
Once the Secured Silicon Sector is programmed, locked and verified, the system must write the Exit Secured
Silicon Sector Region command sequence to return to reading and writing within the remainder of the array.
7.19.2
Factory Locked: Secured Silicon Sector Programmed and Protected At the
Factory
In devices with an ESN, the Secured Silicon Sector is protected when the device is shipped from the factory.
The Secured Silicon Sector cannot be modified in any way. An ESN Factory Locked device has an 16-byte
random ESN at addresses 000000h–000007h. Please contact your sales representative for details on
ordering ESN Factory Locked devices.
Customers may opt to have their code programmed by the factory through the ExpressFlash service (Express
Flash Factory Locked). The devices are then shipped from the factory with the Secured Silicon Sector
permanently locked. Contact your sales representative for details on using the ExpressFlash service.
7.20
Write Protect (WP#)
The Write Protect function provides a hardware method of protecting the first or last sector group without
using VID. Write Protect is one of two functions provided by the WP#/ACC input.
If the system asserts VIL on the WP#/ACC pin, the device disables program and erase functions in the first or
last sector group independently of whether those sector groups were protected or unprotected using the
method described inAdvanced Sector Protection on page 39. Note that if WP#/ACC is at VIL when the device
is in the standby mode, the maximum input load current is increased. See the table in DC Characteristics
If the system asserts VIH on the WP#/ACC pin, the device reverts to whether the first or last sector
was previously set to be protected or unprotected. Note that WP# has an internal pull-up; when
unconnected, WP# is at VIH.
7.21
Hardware Data Protection
The command sequence requirement of unlock cycles for programming or erasing provides data protection
against inadvertent writes (refer to Table 9.1 on page 60 and Table 9.3 on page 62 for command definitions).
In addition, the following hardware data protection measures prevent accidental erasure or programming,
which might otherwise be caused by spurious system level signals during VCC power-up and power-down
transitions, or from system noise.
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