參數(shù)資料
型號: AMD29DL164DT90EI
元件分類: EEPROM
英文描述: EEPROM
中文描述: EEPROM的
文件頁數(shù): 17/53頁
文件大?。?/td> 1167K
代理商: AMD29DL164DT90EI
July 29, 2002
Am29DL16xD
17
Note: The term “sector” in the figure applies to both sectors and sector blocks.
Figure 2.
In-System Sector/Sector Block Protection and Unprotection Algorithms
Sector Protect:
Write 60h to sector
address with
A6 = 0, A1 = 1,
A0 = 0
Set up sector
address
Wait 150 μs
Verify Sector
Protect: Write 40h
to sector address
with A6 = 0,
A1 = 1, A0 = 0
Read from
sector address
with A6 = 0,
A1 = 1, A0 = 0
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
A6 = 1, A1 = 1,
A0 = 0
Set up first sector
address
Wait 15 ms
Verify Sector
Unprotect: Write
40h to sector
address with
A6 = 1, A1 = 1,
A0 = 0
Read from
sector address
with A6 = 1,
A1 = 1, A0 = 0
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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