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S71GLXXXNC0 데이터시트(HTML) 61 Page - SPANSION

부품명 S71GLXXXNC0
상세내용  Stacked Multi-chip Product (MCP)
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S71GLXXXNC0 데이터시트(HTML) 61 Page - SPANSION

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December 15, 2004 S29GLxxxN_MCP_A1
S29GLxxxN MirrorBitTM Flash Family
61
Ad vance
Info rmat i o n
The Secured Silicon sector address space in this device is allocated as follows:
The system accesses the Secured Silicon Sector through a command sequence
(see “Write Protect (WP#)”). After the system has written the Enter Secured Sil-
icon Sector command sequence, it may read the Secured Silicon Sector by using
the addresses normally occupied by the first sector (SA0). This mode of operation
continues until the system issues the Exit Secured Silicon Sector command se-
quence, or until power is removed from the device. On power-up, or following a
hardware reset, the device reverts to sending commands to sector SA0.
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, ac-
celerated 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 cau-
tion 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 se-
quence, and then follow the in-system sector protect algorithm, except that
RESET# may be at either VIH or VID. This allows in-system protection of the
Secured Silicon Sector without raising any device pin to a high voltage. Note
that this method is only applicable to the Secured Silicon Sector.
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.
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 order-
ing 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.
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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