- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄366405 > AM29DL642G90I (Advanced Micro Devices, Inc.) 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only Simultaneous Read/Write Flash Memo PDF資料下載
參數(shù)資料
| 型號： | AM29DL642G90I |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only Simultaneous Read/Write Flash Memo |
| 中文描述： | 128兆位（8米× 16位）的CMOS 3.0伏，只有同時讀/寫閃存?zhèn)渫?/td> |
| 文件頁數(shù)： | 24/54頁 |
| 文件大小： | 828K |
| 代理商： | AM29DL642G90I |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁當前第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁
22
Am29DL642G
June 10, 2005
P R E L I M I N A R Y
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
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 SecSi Sec-
tor unprotected, allowing customers to utilize the that
sector in any manner they choose. The customer-lock-
able version has the SecSi (Secured Silicon) Sector
Indicator Bit permanently set to a “0.” Thus, the SecSi
Sector Indicator Bit prevents customer-lockable de-
vices from being used to replace devices that are fac-
tory locked.
The system accesses the SecSi Sector Secure
through a command sequence (see “Enter SecSi
Sector/Exit SecSi Sector Command Sequence”). After
the system has written the Enter SecSi Sector com-
mand sequence, 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 se-
quence, or until power is removed from the device. On
power-up, or following a hardware reset, the device re-
verts to sending commands to the first 256 bytes of
Sector 0.
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 preprogrammed with both a random number
and a secure ESN. The 8-word random number is at
addresses 000000h–000007h. The secure ESN is pro-
grammed in the next 8 words at addresses
000008h–00000Fh. The device is available prepro-
grammed with one of the following:
■
A random, secure ESN only
■
Customer code through the ExpressFlash service
■
Both a random, secure ESN and customer code
through the ExpressFlash service.
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.
The SecSi Sector can be read any number of times,
but can be programmed and locked only once. 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
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 SecSi Sector Re-
gion without raising any device pin to a high voltage.
Note that this method is only applicable to the SecSi
Sector.
■
Write the three-cycle Enter SecSi Sector Secure
Region command sequence, and then use the alter-
nate method of sector protection described in the
“Sector/Sector Block Protection and Unprotection”
section.
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 lock must be used with caution
since, once locked, there is no procedure available for
unlocking 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 13 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 |
|---|---|
| AM29DL642G90MDI | 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only Simultaneous Read/Write Flash Memo |
| AM29DL800BB120ED | 8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory |
| AM29DL800BT120WBK | 8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory |
| AM29DL800BT70ED | 8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory |
| AM29DL800BT70EF | 8 Megabit (1 M x 8-Bit/512 K 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 |
|---|---|
| AM29DL800BB-120WBD | 制造商:Spansion 功能描述:NOR Flash Parallel 3V/3.3V 8Mbit 1M/512K x 8bit/16bit 120ns 48-Pin FBGA |
| AM29DL800BB-70SI | 制造商:Spansion 功能描述:FLASH PARALLEL 3V/3.3V 8MBIT 1MX8/512KX16 70NS 44SOIC - Trays |
| AM29DL800BB-90EI | 制造商:Spansion 功能描述:NOR Flash Parallel 3V/3.3V 8Mbit 1M/512K x 8bit/16bit 90ns 48-Pin TSOP |
| AM29DL800BT-120EC | 制造商:Spansion 功能描述:SPZAM29DL800BT-120EC TB 120n EOL160610 |
| AM29DL800BT-120WBC | 制造商:Advanced Micro Devices 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。