參數(shù)資料
型號(hào)： AM49PDL127AH70IT
廠商： SPANSION LLC
元件分類： 存儲(chǔ)器
英文描述： 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 16 Mbit (1 M x 16-Bit) CMOS Pseudo Static RAM
中文描述： SPECIALTY MEMORY CIRCUIT, PBGA73
封裝： 8 X 11.60 MM, FBGA-73
文件頁數(shù)： 41/82頁
文件大?。?/td> 565K
代理商： AM49PDL127AH70IT
December 18, 2003
Am49PDL127AH/Am49PDL129AH
39
A D V A N C E I N F O R M A T I O N
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to
V
ID
. During this mode, formerly protected
sectors can be programmed or erased by selecting the
sector addresses. Once V
ID
is removed from the RE-
SET# pin, all the previously protected sectors are
protected again. Figure 2 shows the algorithm, and
Figure 23 shows the timing diagrams, for this feature.
While PPB lock is set, the device cannot enter the
Temporary Sector Unprotection Mode.
Figure 2.
Temporary Sector Unprotect Operation
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 128-word SecSi sector is divided into 64
factory-lockable words that can be programmed and
locked by the customer. The SecSi sector is located at
addresses 000000h-00007Fh in both Persistent Pro-
tection mode and Password Protection mode. It uses
indicator bits (DQ6, DQ7) to indicate the factory-
locked and customer-locked status of the part.
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 normal address space.
Factory-Locked Area (64 words)
The factory-locked area of the SecSi Sector (000000h-
00003Fh) is locked when the part is shipped, whether
or not the area was programmed at the factory. The
SecSi Sector Factory-locked Indicator Bit (DQ7) is per-
manently set to a “1”. AMD offers the ExpressFlash
service to program the factory-locked area with a ran-
dom ESN, a customer-defined code, or any combina-
tion of the two. Because only AMD can program and
protect the factory-locked area, this method ensures
the security of the ESN once the product is shipped to
the field. Contact an AMD representative for details on
using AMD’s ExpressFlash service. Note that the ACC
function and unlock bypass modes are not available
when the SecSi Sector is enabled.
Customer-Lockable Area (64 words)
The customer-lockable area of the SecSi Sector
(000040h-00007Fh) is shipped unprotected, which al-
lows the customer to program and optionally lock the
area as appropriate for the application. The SecSi
Sector Customer-locked Indicator Bit (DQ6) is shipped
as “0” and can be permanently locked to “1” by issuing
the SecSi Protection Bit Program Command. 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 by-
pass functions are not available when programming
the SecSi Sector.
The Customer-lockable SecSi Sector area can be pro-
tected using one of the following procedures:
■
Follow the SecSi Sector Protection Algorithm as
shown in Figure 3. This allows in-system protection
of the SecSi Sector without raising any device pin to
a high voltage. Note that this method is only appli-
cable to the SecSi Sector.
Notes:
1. All protected sectors unprotected (If WP#/ACC = V
IL
,
sectors 0, 1, 268, 269 in PDL 127 or in SA1-133, SA1-
134, SA2-0, SA2-1 in PDL 129.will remain protected).
2. All previously protected sectors are protected once
again.
START
Perform Erase or
Program Operations
RESET# = V
IH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = V
ID
(Note 1)
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