S70GL01GN00 Datasheet, PDF (37/83 Pages) SPANSION – 3.0 Volt-only Page Mode Flash Memory featuring 110 nm MirrorBit™ Process Technology

Advance Information
resentative for ordering information). The customer-lockable version is shipped
with the Secured Silicon Sector unprotected, allowing customers to program the
sector after receiving the device. The customer-lockable version also has the Se-
cured Silicon Sector Indicator Bit permanently set to a 0. The factory-locked
version is always protected when shipped from the factory, and has the Secured
Silicon Sector Indicator Bit permanently set to a 1. Thus, the Secured Silicon Sec-
tor Indicator Bit prevents customer-lockable devices from being used to replace
devices that are factory locked. Note that the ACC function and unlock bypass
modes are not available when the Secured Silicon Sector is enabled.
The Secured Silicon sector address space in this device is allocated as follows:
Secured Silicon Sector
Address Range
000000h–000007h
000008h–00007Fh
Customer Lockable ESN Factory Locked
ExpressFlash
Factory Locked
Determined by
customer
ESN
Unavailable
ESN or determined by
customer
Determined by
customer
The system accesses the Secured Silicon Sector through a command sequence
(see Write Protect (WP#)‚ on page 36). After the system writes the Enter Se-
cured Silicon 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 com-
mand sequence, 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‚ on page 39.
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 V_IH or V_ID. 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.
June 1, 2005 S70GL01GN00_00_A1
S70GL01GN00 MirrorBit^TM Flash
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