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参数资料
| 型号： | AM29DS163DT120WAK |
| 厂商： | Advanced Micro Devices, Inc. |
| 英文描述： | 16 Megabit CMOS 1.8 Volt-only, Simultaneous Operation Flash Memory |
| 中文描述： | 16兆位的CMOS 1.8伏只，同时作业快闪记忆体 |
| 文件页数： | 19/50页 |
| 文件大小： | 1682K |
| 代理商： | AM29DS163DT120WAK |
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Am29DS163D
19
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
an additional 64Kbyte Flash memory region that en-
ables permanent part identification through an
Electronic Serial Number (ESN). An SecSi Sector Indi-
cator Bit indicates whether or not the SecSi Sector is
locked when shipped from the factory. This bit is per-
manently 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.
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 the SecSi Sector Indicator Bit is
permanently set to a “1.” The customer-lockable ver-
sion is shipped with the unprotected, allowing
customers to utilize the that sector in any manner they
choose. In the customer-lockable version, the SecSi
Sector Indicator Bit is permanently set to a “0.” Thus,
the SecSi Sector Indicator Bit prevents customer-lock-
able devices from being used to replace devices that
are factory locked.
The system accesses the SecSi Sector through a
command sequence (see
“Enter SecSi Sector/Exit
SecSi Sector Command Sequence” on page 24
). After
the system writes the Enter SecSi Sector command
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 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.
The following restrictions apply to using the SecSi
Sector: Once the device enters the SecSi Sector, any
attempt to initiate program or erase operations in the
array is ignored until the device exits the SecSi Sector.
Conversely, when a program or erase operation in the
array is in progress, the device ignores any attempt to
enter the SecSi Sector until programming or erasing is
complete.
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
following:
■
A random, secure ESN only
■
Customer code through the ExpressFlash service
■
Both a random, secure ESN and customer code
through the ExpressFlash service.
In devices that have an ESN, a Bottom Boot device
has the 16-byte ESN at addresses 00000h–00007h in
word mode (or 000000h–00000Fh in byte mode). In
the Top Boot device the starting address of the ESN is
at addresses F8000h–F8007h in word mode (or
1F0000h–1F000Fh 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 permanently locked. Contact an AMD
representative for details on using AMD’s Express-
Flash 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, programmed,
and erased as often as required. 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 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 Region
command sequence, and then use the alternate
method of sector protection described in
“Sec-
tor/Sector Block Protection and Unprotection” on
page 16
.
Once the SecSi Sector is locked and verified, the sys-
tem must write the Exit SecSi Sector Region
command sequence to return to reading and writing
the remainder of the array.
The SecSi Sector protection must be used with cau-
tion since, once protected, there is no procedure
available for unprotecting the SecSi Sector area and
none of the bits in the SecSi Sector memory space
can be modified in any way. Note also that the multiple
program and erase capability of the customer lockable
version of this device may be subject to change on fu-
ture device revisions.
Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
against inadvertent writes (refer to
Table 14 on
page 27
for command definitions). In addition, the fol-
lowing hardware data protection measures prevent
accidental erasure or programming, which might oth-
erwise be caused by spurious system level signals
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