AM29LV065DU90REF Spansion Inc., AM29LV065DU90REF Datasheet - Page 21

• Manufacturer Part Number: AM29LV065DU90REF
• Description: Flash Memory IC
• Manufacturer: Spansion Inc.

Specifications of AM29LV065DU90REF

• Memory Size: 64Mbit
• Memory Configuration: 8M X 8
• Ic Interface Type: Parallel
• Access Time: 90ns
• Memory Case Style: TSOP
• No. Of Pins: 48
• Operating Temperature Range: -40°C To +85°C
• Termination Type: SMD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SecSi (Secured Silicon) Sector Flash
Memory Region
The SecSi (Secured Silicon) Sector feature provides a
Flash memory region that enables permanent part
identification through an Electronic Serial Number
(ESN). The SecSi Sector is 256 bytes in length, and
uses a SecSi Sector Indicator Bit (DQ7) to indicate
whether or not the SecSi Sector is locked when
shipped from the factory. This bit is permanently set at
the factory and cannot be changed, which prevents
cloning of a factory locked part. This ensures the secu-
rity of the ESN once the product is shipped to the field.
AMD offers the device with the SecSi Sector either
facto r y locked or c ustomer lock able. The fac-
tory-locked version is always protected when shipped
from the factory, and has the SecSi (Secured Silicon)
Sector Indicator Bit permanently set to a “1.” The cus-
tomer-lockable version is shipped with the SecSi Sec-
tor unprotected, allowing customers to utilize that
sector in any manner they choose. The customer-lock-
able version also has the SecSi Sector Indicator Bit
permanently set to a “0.” Thus, the SecSi Sector Indi-
cator Bit prevents customer-lockable devices from
being used to replace devices that are factory locked.
The SecSi sector address space in this device is allo-
cated as follows:
The system accesses the SecSi Sector through a
command sequence (see
SecSi Sector Command
has written the Enter SecSi Sector command se-
quence, it may read the SecSi Sector by using the ad-
dresses normally occupied by the first sector (SA0).
This mode of operation continues until the system is-
sues the Exit SecSi Sector command 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.
February 16, 2006
000010h–00007Fh,
000000h–00000Fh
000400h–00047Fh
Address Range
SecSi Sector
Table 5. SecSi Sector Contents
Factory Locked
Unavailable
Standard
ESN
Sequence”). After the system
“Enter SecSi Sector/Exit
Factory Locked
ExpressFlash
Determined by
determined by
customer
customer
ESN or
Determined by
Customer
Lockable
customer
Am29LV065D
Factory Locked: SecSi Sector Programmed and
Protected At the Factory
In devices with an ESN, the SecSi Sector is protected
when the device is shipped from the factory. The SecSi
Sector cannot be modified in any way. A factory locked
device has an 16-byte random ESN at addresses
000000h–00000Fh.
Customers may opt to have their code programmed by
AMD through the AMD ExpressFlash service. The de-
vices are then shipped from AMD’s factory with the
SecSi Sector permanently locked. Contact an AMD
representative for details on using AMD’s Express-
Flash service.
Customer Lockable: SecSi Sector NOT
Programmed or Protected At the Factory
As an alternative to the factory-locked version, the de-
vice may be ordered such that the customer may pro-
gram and protect the 256-byte SecSi sector. The
SecSi Sector is one-time programmable, may not be
erased, and can be locked only once. Note that the ac-
celerated programming (ACC) and unlock bypass
functions are not available when programming the
SecSi Sector.
The SecSi Sector area can be protected using one of
the following procedures:
■ Write the three-cycle Enter SecSi Sector Region
■ To verify the protect/unprotect status of the SecSi
Once the SecSi Sector is locked and verified, the sys-
tem must write the Exit SecSi Sector Region com-
mand sequence to return to reading and writing the
remainder of the array.
The SecSi Sector protection must be used with cau-
tion since, once protected, there is no procedure avail-
able for unprotecting the SecSi Sector area and none
of the bits in the SecSi Sector memory space can be
modified in any way.
command sequence, and then follow the in-system
sector protect algorithm as shown in
cept that RESET# may be at either V
allows in-system protection of the SecSi Sector
without raising any device pin to a high voltage.
Note that this method is only applicable to the SecSi
Sector.
Sector, follow the algorithm shown in
Figure
IH
Figure
or V
ID
3.
2, ex-
. This
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