AM29LV128MH123REI Spansion Inc., AM29LV128MH123REI Datasheet - Page 24

• Manufacturer Part Number: AM29LV128MH123REI
• Manufacturer: Spansion Inc.

Specifications of AM29LV128MH123REI

• Cell Type: NOR
• Density: 128Mb
• Access Time (max): 120ns
• Interface Type: Parallel
• Boot Type: Not Required
• Address Bus: 24/23Bit
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: TSOP
• Program/erase Volt (typ): 3/11.5 to 12.5V
• Sync/async: Asynchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8/16Bit
• Number Of Words: 16M/8M
• Supply Current: 43mA
• Mounting: Surface Mount
• Pin Count: 56
• Lead Free Status / Rohs Status: Not Compliant

Secured Silicon Sector Flash
Memory Region
The Secured Silicon Sector feature provides a Flash
memory region that enables permanent part identifica-
tion through an Electronic Serial Number (ESN). The
Secured Silicon Sector is 256 bytes in length, and
uses a Secured Silicon Sector Indicator Bit (DQ7) to
indicate whether or not the Secured Silicon Sector is
locked when shipped from the factory. This bit is per-
manently set at the factory and cannot be changed,
which prevents cloning of a factory locked part. This
ensures the security of the ESN once the product is
shipped to the field.
AMD offers the device with the Secured Silicon Sector
either customer lockable (standard shipping option) or
factory locked (contact an AMD sales representative
for ordering information). The customer-lockable ver-
sion is shipped with the Secured Silicon Sector unpro-
tected, allowing customers to program the sector after
receiving the device. The customer-lockable version
also has the Secured Silicon Sector Indicator Bit per-
manently set to a “0.” The factory-locked version is al-
ways protected when shipped from the factory, and
has the Secured Silicon Sector Indicator Bit perma-
nently set to a “1.” Thus, the Secured Silicon Sector In-
dicator 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 de-
vice is allocated as follows:
The system accesses the Secured Silicon Sector
through a command sequence (see
S i l i c o n S e c t o r / E x i t S e c u r e d S i l i c o n S e c t o r
Command Sequence”
has written the Enter Secured Silicon Sector com-
mand sequence, it may read the Secured Silicon Sec-
tor 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 sequence, or until power is removed from
24
000008h–00007Fh
000000h–000007h
Secured Silicon
Sector Address
Table 5. Secured Silicon Sector Contents
Range
Determined by
Customer
Lockable
customer
on page 30). After the system
ESN Factory
Unavailable
Locked
ESN
“Enter Secured
Factory Locked
ExpressFlash
Determined by
determined by
D A T A
customer
customer
ESN or
Am29LV128MH/L
S H E E T
the device. On power-up, or following a hardware re-
set, 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.
Programming and protecting the Secured Silicon Sec-
tor 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 modi-
fied in any way.
The Secured Silicon Sector area can be protected
using one of the following procedures:
Once the Secured Silicon Sector is programmed,
locked and verified, the system must write the Exit Se-
cured 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 local AMD sales representative for details
on ordering ESN Factory Locked devices.
Customers may opt to have their code programmed by
AMD through the AMD ExpressFlash service (Express
Flash Factory Locked). The devices are then shipped
from AMD’s factory with the Secured Silicon Sector
permanently locked. Contact an AMD representative
for details on using AMD’s ExpressFlash service.
Write the three-cycle Enter Secured Silicon Sector
Region command sequence, and then follow the
in-system sector protect algorithm as shown in
Figure
or V
cured Silicon Sector without raising any device pin
to a high voltage. Note that this method is only ap-
plicable to the Secured Silicon Sector.
To verify the protect/unprotect status of the Secured
Silicon Sector, follow the algorithm shown in
Figure
ID
. This allows in-system protection of the Se-
2, except that RESET# may be at either V
3.
25270C7 January 31, 2007
IH