AM29DL323DB-120EI Spansion Inc., AM29DL323DB-120EI Datasheet - Page 21

• Manufacturer Part Number: AM29DL323DB-120EI
• Manufacturer: Spansion Inc.

Specifications of AM29DL323DB-120EI

• Cell Type: NOR
• Density: 32Mb
• Access Time (max): 120ns
• Interface Type: Parallel
• Boot Type: Bottom
• Address Bus: 22/21Bit
• Operating Supply Voltage (typ): 3.3V
• Operating Temp Range: -40C to 85C
• Package Type: TSOP
• Program/erase Volt (typ): 3/8.5 to 9.5V
• Sync/async: Asynchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8/16Bit
• Number Of Words: 4M/2M
• Supply Current: 16mA
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / Rohs Status: Not Compliant

SecSi
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 uses a SecSi Sector Indica-
tor 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 security of the ESN once the
product is shipped to the field. Current version of de-
vice has 64 Kbytes; future versions will have only
256 bytes. This should be considered during sys-
tem design.
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
Sector unprotected, allowing customers to utilize the
that sector in any manner they choose. The cus-
tomer-lockable version has the SecSi (Secured
Silicon) Sector Indicator Bit permanently set to a “0.”
Thus, the SecSi Sector Indicator Bit prevents cus-
tomer-lockable devices from being used to replace
devices that are factory locked.
The system accesses the SecSi Sector through a
command sequence (see “Enter SecSi
SecSi Sector Command Sequence”). After the system
has written the Enter SecSi Sector command se-
quence, it may read the SecSi Sector by using the
addresses normally occupied by the boot sectors. This
mode of operation continues until the system issues
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 send-
ing commands to the boot sectors.
Factory Locked: SecSi Sector Programmed and
Protected At the Factory
In a factory locked device, the SecSi Sector is pro-
tected when the device is shipped from the factory.
The SecSi Sector cannot be modified in any way. The
device is available preprogrammed with one of the
following:
■ A random, secure ESN only
■ Customer code through the ExpressFlash service
■ Both a random, secure ESN and customer code
In devices that have an ESN, a Bottom Boot device
w i l l h a v e t h e 1 6 - b y t e E S N a t a d d r e s s e s
0 0 0 0 0 0 h – 0 0 0 0 0 7 h
20
through the ExpressFlash service.
TM
(Secured Silicon) Sector
i n
w o r d
TM
m o d e
Sector/Exit
Am29DL322D/323D/324D
( o r
000000h–00000Fh in byte mode). In the Top Boot de-
vice the ESN will be at addresses 1F8000h–1F8007h
in word mode (or addresses 3F0000h–3F000Fh in
byte mode). Note that in upcoming top boot versions
of this device, the ESN will be located at addresses
1FF000h–1FF007h in word mode (or addresses
3FE000h–3FE00Fh in byte mode).
Customers may opt to have their code programmed by
AMD through the AMD ExpressFlash service. AMD
programs the customer’s code, with or without the ran-
dom ESN. The devices are then shipped from AMD’s
factory with the SecSi Sector permanently locked.
Contact an AMD representative for details on using
AMD’s ExpressFlash service.
Customer Lockable: SecSi Sector NOT
Programmed or Protected At the Factory
If the security feature is not required, the SecSi Sector
can be treated as an additional Flash memory space,
expanding the size of the available Flash array. Cur-
rent version of device has 64 Kbytes; future
versions will have only 256 bytes. This should be
considered during system design. Additionally,
note the change in the location of the ESN in up-
coming top boot factory locked devices. The SecSi
Sector can be read, programmed, and erased as often
as required. (Note that in upcoming versions of this
device, the SecSi Sector erase function will not be
available.) Note that the accelerated 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
■ Write the three-cycle Enter SecSi Sector Region
Once the SecSi Sector is locked and verified, the sys-
t em mu st w r i t e t h e E x i t Se c S i S e c t o r R e g i o n
command 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
available 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 Figure 2, ex-
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
command sequence, and then use the alternate
method of sector protection described in the “Sec-
tor/Sector Block Protection and Unprotection” sec-
tion.
December 13, 2005
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