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參數(shù)資料
| 型號： | AM49PDL640AGA70NS |
| 廠商： | SPANSION LLC |
| 元件分類： | 存儲器 |
| 英文描述： | 64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 16 Mbit (1 M x 16-Bit) Pseudo Static RAM |
| 中文描述： | SPECIALTY MEMORY CIRCUIT, PBGA73 |
| 封裝： | 13 X 9 MM, FBGA-73 |
| 文件頁數(shù)： | 24/69頁 |
| 文件大?。?/td> | 491K |
| 代理商： | AM49PDL640AGA70NS |
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Am49PDL640AG
November 20, 2003
P R E L I M I N A R Y
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 Note:,
except that RESET# may be at either V
IH
or V
ID
.
This allows in-system protection of the SecSi Sector
Region without raising any device pin to a high volt-
age. Note that this method is only applicable to the
SecSi Sector.
■
To verify the protect/unprotect status of the SecSi
Sector, follow the algorithm shown in Figure 3.
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.
SecSi Sector Protection Bit
The SecSi Sector Protection Bit prevents program-
ming of the SecSi Sector memory area. Once set, the
SecSi Sector memory area contents are non-modifi-
able.
Figure 3.
SecSi Sector Protect Verify
Write 60h to
any address
Write 40h to SecSi
Sector address
with A6 = 0,
A1 = 1, A0 = 0
START
RESET# =
V
IH
or V
ID
Wait 1
μ
s
Read from SecSi
Sector address
with A6 = 0,
A1 = 1, A0 = 0
If data = 00h,
SecSi Sector is
unprotected.
If data = 01h,
SecSi Sector is
protected.
Remove V
or V
ID
from RESET#
Write reset
command
SecSi Sector
Protect Verify
complete
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| AM49PDL640AGA70NT | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 16 Mbit (1 M x 16-Bit) Pseudo Static RAM |
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