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W19B320AT/B
7.7 In-System Sector Protect/Unprotect Algorithms
START
START
PLSCNT=1
#RESET=VID
Wait 1 μ s
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
PLSCNT=1
#RESET=V ID
Wait 1 μ s
Temporary Sector
Unprotect Mode
No
First Write
Cycle=60h?
First Write
Cycle=60h?
No
Temporary Sector
Unprotect Mode
Yes
Set up sector
address
Sector Protect:
Write 60h to sector
address with
A6=0,A1=1,A0=0
Wait 150 μ s
Verity Sector
No
Yes
All sectors
protected ?
Yes
Set up first sector
address
Sector Unprotect:
Write 60h to any
address with
A6=1,A1=1,A0=0
Increment
PLSCNT
Protect:Write 40h
to sector address
with A6=0,
A1=1,A0=0
Reset
PLSCNT=1
Increment
Wait 15 mS
PLSCNT
Verity Sector
No
PLSCNT
=25?
No
Read from
sector address
with A6=0,
A1=1,A0=0
Data=01h?
Unprotect:Write 40h
to sector address
with A6=1,
A1=1,A0=0
Read from
sector address
with A6=1,
A1=1,A0=0
Device failed
Yes
Yes
Protect another
sector?
Yes
No
PLSCNT
=1000?
No
Data=00h?
Set up
next sector
address
No
Yes
Yes
Sector Protect
Algorithm
Remove V ID
from #RESET
Write reset
command
Sector Protect
complete
Device failed
Sector Unprotect
Algorithm
Last sector
verified
Yes
Remove V ID
from #RESET
No
Write reset
command
Sector Unprotect
complete
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功能描述:IC FLASH 32MBIT 70NS 48TSOP RoHS:是 类别:集成电路 (IC) >> 存储器 系列:- 产品变化通告:Product Discontinuation 26/Apr/2010 标准包装:136 系列:- 格式 - 存储器:RAM 存储器类型:SRAM - 同步，DDR II 存储容量:18M（1M x 18） 速度:200MHz 接口:并联 电源电压:1.7 V ~ 1.9 V 工作温度:0°C ~ 70°C 封装/外壳:165-TBGA 供应商设备封装:165-CABGA（13x15） 包装:托盘 其它名称:71P71804S200BQ