參數(shù)資料
型號(hào)： AM49BDS640AHD9I
廠商： SPANSION LLC
元件分類： 存儲(chǔ)器
英文描述： Stacked Multichip Package (MCP), Flash Memory and pSRAM CMOS 1.8 Volt-only Simultaneous Read/Write
中文描述： SPECIALTY MEMORY CIRCUIT, PBGA89
封裝： 10 X 8 MM, FBGA-89
文件頁數(shù)： 23/84頁
文件大?。?/td> 763K
代理商： AM49BDS640AHD9I
December 5, 2003
Am49BDS640AH
21
A D V A N C E I N F O R M A T I O N
Figure 2.
Sector Unprotection Algorithms
In-System Sector Protection/
Sector Protect:
Write 60h to sector
address with
A7
–
A0 =
00000010
Set up sector
address
Wait 150 μs
Verify Sector
Protect: Write 40h
to sector address
with A7
–
A0 =
00000010
Read from
sector address
with A7
–
A0 =
00000010
START
PLSCNT = 1
RESET# = V
ID
Wait 1
μ
s
First Write
Cycle = 60h
Data = 01h
Remove V
from RESET#
Write reset
command
Sector Protect
complete
Yes
Yes
No
PLSCNT
= 25
Yes
Device failed
Increment
PLSCNT
Temporary Sector
Unprotect Mode
No
Sector Unprotect:
Write 60h to sector
address with
A7:A0 =
01000010
Set up first sector
address
Wait 15 ms
Verify Sector
Unprotect: Write
40h to sector
address with
A7
–
A0 =
00000010
Read from
sector address
with A7
–
A0 =
00000010
START
PLSCNT = 1
RESET# = V
ID
Wait 1
μ
s
Data = 00h
Last sector
verified
Remove V
from RESET#
Write reset
command
Sector Unprotect
complete
Yes
No
PLSCNT
= 1000
Yes
Device failed
Increment
PLSCNT
Temporary Sector
Unprotect Mode
No
All sectors
protected
Yes
Protect all sectors:
The indicated portion
of the sector protect
algorithm must be
performed for all
unprotected sectors
prior to issuing the
first sector
unprotect address
Set up
next sector
address
No
Yes
No
Yes
No
No
Yes
No
Sector Protect
Algorithm
Sector Unprotect
Algorithm
First Write
Cycle = 60h
Protect another
sector
Reset
PLSCNT = 1
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