AM29LV320DT90EI AMD (ADVANCED MICRO DEVICES), AM29LV320DT90EI Datasheet - Page 20

• 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

SecSi
Memory Region
The Secured Silicon Sector (SecSi Sector) fea-
ture provides a Flash memory region that en-
ables permanent part identification through an
Electronic Serial Number (ESN). The SecSi Sec-
tor 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 security of the
ESN once the product is shipped to the field.
Note that the Am29LV320D has a SecSi
Sector size of 64 Kbytes. AMD devices des-
ignated as replacements or substitutes,
such as the Am29LV320M, have 256 bytes.
This should be considered during system
design.
AMD offers the device with the SecSi Sector ei-
ther factory locked or customer lockable. The
factory-locked version is always protected
when shipped from the factory, and has the
SecSi Sector Indicator Bit permanently set to a
“1.” The customer-lockable version is shipped
with the SecSi Sector unprotected, allowing
customers to utilize the that sector in any man-
ner they choose. The customer-lockable ver-
s i o n h a s t h e S e c S i S e c t o r I n d i c a t o r B i t
permanently set to a “0.” Thus, the SecSi Sec-
tor Indicator Bit prevents customer-lockable
devices from being used to replace devices that
are factory locked.
The system accesses the SecSi Sector through
a command sequence (see
tor/Exit SecSi Sector Command Sequence” on
page
SecSi Sector command sequence, it may read
the SecSi Sector by using the addresses nor-
mally 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 sending commands to the
boot sectors.
Factory Locked: SecSi Sector Programmed
and Protected at the Factory
In a factory locked device, the SecSi Sector is
protected when the device is shipped from the
factory. The SecSi Sector cannot be modified in
a ny way. T h e d ev i ce i s a va i la bl e p r e p r o-
grammed with one of the following:
20
A random, secure ESN only
26). After the system writes the Enter
TM
Sector (Secured Silicon) Flash
“Enter SecSi
TM
Sec-
Am29LV320D
In devices that have an ESN, a Bottom Boot de-
vice 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 sector 63 at ad-
dresses 3F0000h–3F000Fh in byte mode (or
1F8000h–1F8007h in word mode). Note that in
upcoming top boot versions of this device, the
E SN is l ocate d i n se cto r 7 0 at add res ses
3 F E 0 0 0 h – 3 F E 0 0 F h
1FF000h–1FF007h in word mode).
Customers may opt to have their code pro-
grammed by AMD through the AMD Express-
Flash service. AMD programs the customer’s
code, with or without the random ESN. 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 ExpressFlash service.
Customer Lockable: SecSi Sector NOT
Programmed or Protected at the Factory
The customer lockable version allows the SecSi
Sector to be programmed once and then per-
manently locked after it ships from AMD. Note
that the Am29LV320D has a SecSi Sector
size of 64 Kbytes. AMD devices designated
as replacements or substitutes, such as
the Am29LV320M, have 256 bytes. This
should be considered during system de-
sign. Additionally, note the change in the
location of the ESN in upcoming top boot
factory locked devices. Note that the accel-
erated programming (ACC) and unlock bypass
functions are not available when programming
the SecSi Sector.
The SecSi Sector area can be protected using
the following procedures:
Customer code through the ExpressFlash
service
Both a random, secure ESN and customer
code through the ExpressFlash service.
Write the three-cycle Enter SecSi Region
command sequence, and then follow the
in-system sector protect algorithm as shown
in
may be at either V
in-system protection of the SecSi Sector
without raising any device pin to a high volt-
age. Note that this method is only applicable
to the SecSi Sector.
To verify the protect/unprotect status of the
SecSi Sector, follow the algorithm shown in
Figure 3, on page
Figure 2, on page
21.
19, except that RESET#
i n
IH
or V
b y t e
November 15, 2004
ID
. This allows
m o d e
( o r