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| 型號： | AM29DL322CT90 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory |
| 中文描述： | 32兆位（4個M × 8位/ 2米x 16位），3.0伏的CMOS只，同時作業(yè)快閃記憶體 |
| 文件頁數(shù)： | 19/52頁 |
| 文件大小： | 363K |
| 代理商： | AM29DL322CT90 |
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Am29DL322C/Am29DL323C
A D V A N C E I N F O R M A T I O N
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 64 Kbytes 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
factory locked or customer lockable. 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 Secure
Sector unprotected, allowing customers to utilize the
that sector in any manner they choose. The cus-
tomer-lockable version has the SecSi (Secured Sili-
con) Sector Indicator Bit permanently set to a “0.”
Thus, the SecSi Sector Indicator Bit prevents cus-
tomer-lockable devices from being used to replace de-
vices that are factory locked.
The system accesses the SecSi Sector through a
command sequence (see “Enter SecSi Sector/Exit
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 ad-
dresses 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 fol-
lowing:
I
A random, secure ESN only
I
Customer code through the ExpressFlash service
I
Both a random, secure ESN and customer code
through the ExpressFlash service.
In devices that have an ESN, a Bottom Boot device will
have the 16-byte ESN in the lowest addressable mem-
ory area at addresses 000000h–000007h in word
mode (or 000000h–00000Fh in byte mode). In the Top
Boot device the starting address of the ESN will be at
the bottom of the lowest 8 Kbyte boot sector at ad-
dresses 1F8000h–1F8007h in word mode (or ad-
dresses 3F0000h–3F000Fh 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 Secure 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 by
64 Kbytes. The SecSi Sector can be read, pro-
grammed, and erased as often as required. The SecSi
Sector area can be protected using one of the
following procedures:
I
Write the three-cycle Enter Secure Sector Region
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
IH
or V
ID
. This
allows in-system protection of the Secure Sector
without raising any device pin to a high voltage.
Note that this method is only applicable to the Se-
cure Sector.
I
Write the three-cycle Enter Secure Sector Region
command sequence, and then use the alternate
method of sector protection described in the “Sec-
tor/Sector Block Protection and Unprotection” sec-
tion.
Once the Secure Sector is locked and verified, the
system must write the Exit Secure Sector Region com-
mand sequence to return to reading and writing the re-
mainder 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.
Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
against inadvertent writes (refer to Table 14 for com-
mand definitions). In addition, the following hardware
data protection measures prevent accidental erasure
or programming, which might otherwise be caused by
spurious system level signals during V
CC
power-up
and power-down transitions, or from system noise.
Low V
CC
Write Inhibit
When V
CC
is less than V
LKO
, the device does not ac-
cept any write cycles. This protects data during V
CC
相關(guān)PDF資料 |
PDF描述 |
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| AM29DL323CB120 | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory |
| AM29DL323CB90 | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory |
| AM29DL323CT120 | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory |
| AM29DL323CT90 | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory |
| AM29DL322D_05 | 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM29DL322DB7REIT | 制造商:AMD 功能描述:New |
| AM29DL322DB-90WDIT | 制造商:Spansion 功能描述:FLASH PARALLEL 3V/3.3V 32MBIT 4MX8/2MX16 90NS 63FBGA - Tape and Reel |
| AM29DL322DT-90EI-T | 制造商:Advanced Micro Devices 功能描述: |
| AM29DL322GB-90EI | 制造商:Advanced Micro Devices 功能描述:2M X 16 FLASH 3V PROM, 90 ns, 48 Pin Plastic SMT |
| AM29DL322GT-90EI | 制造商:Advanced Micro Devices 功能描述:Flash Mem Parallel 3.3V 32M-Bit 4M x 8/2M x 16 90ns 48-Pin TSOP |
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