參數(shù)資料
型號(hào)： AM49DL640BH70IS
廠商： SPANSION LLC
元件分類： 存儲(chǔ)器
英文描述： 64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory
中文描述： SPECIALTY MEMORY CIRCUIT, PBGA73
封裝： 8 X 11.60 MM, FBGA-73
文件頁(yè)數(shù)： 23/63頁(yè)
文件大?。?/td> 660K
代理商： AM49DL640BH70IS
December 5, 2003
Am49DL640BH
21
A D V A N C E I N F O R M A T I O N
Figure 2.
In-System Sector Protect/Unprotect Algorithms
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 factory-
locked version is always protected when shipped from
the factory, and has the SecSi (Secured Silicon) Sec-
tor 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 customer-
lockable version has the SecSi (Secured Silicon) Sec-
tor Indicator Bit permanently set to a “0.” Thus, the
SecSi Sector Indicator Bit prevents customer-lockable
devices from being used to replace devices that are
factory 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 will at
addresses 000000h–000007h in word mode. The se-
cure ESN will be programmed in the next 8 words at
addresses 000008h–00000Fh. 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
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 12 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.
相關(guān)PDF資料
PDF描述
AM49DL640BH70IT 64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory
AM49DL640BH85IS 64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory
AM49DL640BH85IT 64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory
AM49LV128BM 128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
AM49LV128BMAH11NS 128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM49DL640BH70IT 制造商:SPANSION 制造商全稱:SPANSION 功能描述:64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory
AM49DL640BH85IS 制造商:SPANSION 制造商全稱:SPANSION 功能描述:64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory
AM49DL640BH85IT 制造商:SPANSION 制造商全稱:SPANSION 功能描述:64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory
AM49LV128BM 制造商:SPANSION 制造商全稱:SPANSION 功能描述:128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
AM49LV128BMAH11NS 制造商:SPANSION 制造商全稱:SPANSION 功能描述:128 Megabit (8 M x 16-Bit) MirrorBit⑩ Uniform Sector Flash Memory and 32 Mbit (2 M x 16-Bit)
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