AM29LV320DT90EI AMD (ADVANCED MICRO DEVICES), AM29LV320DT90EI Datasheet - Page 22

• Manufacturer Part Number: AM29LV320DT90EI
• Description: Flash Memory IC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM29LV320DT90EI

• Memory Configuration: 4M X 8 / 2M X 16 Bit
• Package/case: 48-TSOP
• Supply Voltage Max: 3.6V
• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• Access Time, Tacc: 90nS
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Secured Silicon Sector Flash Memory
Region
The Secured Silicon sector provides a Flash memory
region that enables permanent part identification
through an Electronic Serial Number (ESN). The Se-
cured Silicon sector uses a Secured Silicon Indicator
Bit (DQ7) to indicate whether or not the Secured Sili-
con 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. Note that the
Am29LV320D has a Secured Silicon sector size of
64 Kbytes. AMD devices designated as replace-
ments or substitutes, such as the Am29LV320M,
have 256 bytes. This should be considered during
system design.
AMD offers the device with the Secured Silicon sector
either factory locked or customer lockable. The fac-
tory-locked version is always protected when shipped
from the factory, and has the Secured Silicon sector
Indicator Bit permanently set to a “1.” The cus-
tomer-lockable version is shipped with the Secured
Silicon sector unprotected, allowing customers to uti-
lize the that sector in any manner they choose. The
customer-lockable version has the Secured Silicon In-
dicator Bit permanently set to a “0.” Thus, the Secured
Silicon Indicator Bit prevents customer-lockable de-
vices from being used to replace devices that are fac-
tory locked.
The system accesses the Secured Silicon sector
through a command sequence (see “Enter Secured
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” on page 25). After the system
writes the Enter Secured Silicon sector command se-
quence, it may read the Secured Silicon Sector by
using the addresses normally occupied by the boot
sectors. 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 the boot
sectors.
Factory Locked: Secured Silicon Sector
Programmed and Protected at the Factory
In a factory locked device, the Secured Silicon Sector
is protected when the device is shipped from the fac-
tory. The Secured Silicon 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
20
through the ExpressFlash service.
D A T A S H E E T
Am29LV320D
In devices that have an ESN, a Bottom Boot device
has the 16-byte (8-word) ESN in sector 0 at addresses
00000h–0000Fh in byte mode (or 00000h–00007h in
word mode). In the Top Boot device the ESN is in sec-
tor 63 at addresses 3F0000h–3F000Fh in byte mode
(or 1F8000h–1F8007h in word mode). Note that in up-
coming top boot versions of this device, the ESN is lo-
cated in sector 70 at addresses 3FE000h–3FE00Fh in
byte mode (or 1FF000h–1FF007h in word 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 Secured Silicon Sector permanently
locked. Contact an AMD representative for details on
using AMD’s ExpressFlash service.
Customer Lockable: Secured Silicon Sector NOT
Programmed or Protected at the Factory
The customer lockable version allows the Secured Sil-
icon Sector to be programmed once and then perma-
nently locked after it ships from AMD. Note that the
Am29LV320D has a Secured Silicon Sector size of
64 Kbytes. AMD devices designated as replace-
ments or substitutes, such as the Am29LV320M,
have 256 bytes. This should be considered during
system design. Additionally, note the change in
the location of the ESN in upcoming top boot fac-
tory locked devices. Note that the accelerated pro-
gramming (ACC) and unlock bypass functions are not
available when programming the Secured Silicon Sec-
tor.
The Secured Silicon Sector area can be protected
using the following procedures:
■ Write the three-cycle Enter Secured Silicon Sector
■ To verify the protect/unprotect status of the Secured
Once the Secured Silicon Sector is locked and veri-
fied, the system must write the Exit Secured Silicon
Sector command sequence to return to reading and
writing the remainder of the array.
The Secured Silicon Sector protection must be used
with caution since, once protected, there is no proce-
dure 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.
command sequence, and then follow the in-system
sector protect algorithm as shown in
page
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.
Silicon Sector, follow the algorithm shown in
3, on page
ID
19, except that RESET# may be at either V
. This allows in-system protection of the Se-
21.
December 14, 2005
Figure 2, on
Figure
IH