參數(shù)資料
型號(hào)： HY29LV400TT70I
廠商： Hynix Semiconductor Inc.
英文描述： 4 Mbit (512K x 8/256K x 16) Low Voltage Flash Memory
中文描述： 4兆位（為512k × 8/256K × 16）低壓快閃記憶體
文件頁(yè)數(shù)： 9/40頁(yè)
文件大?。?/td> 564K
代理商： HY29LV400TT70I
9
Rev. 1.0/Nov. 01
HY29LV400
Sector Protect Operation
The hardware sector protection feature disables
both program and erase operations in any sector
or combination of sectors. This function can be
implemented either in-system or by using program-
ming equipment.
The Sector Protect procedure requires V
ID
on the
RESET# pin and uses standard microprocessor
bus cycle timing to implement sector protection.
The flow chart in Figure 1 illustrates the algorithm.
The HY29LV400 is shipped with all sectors un-
protected. It is possible to determine whether a
sector is protected or unprotected. See the Elec-
tronic ID Mode section for details.
Sector Unprotect Operation
The hardware sector unprotection feature re-en-
ables both program and erase operations in pre-
viously protected sectors. This function can be
implemented either in-system or by using program-
ming equipment. Note that to unprotect any sec-
tor, all unprotected sectors must first be protected
prior to the first sector unprotect write cycle. Also,
the unprotect procedure will cause all sectors to
become unprotected, thus, sectors that require
START
RESET# = V
ID
Wait 1 us
Write 0x60 to device
Write 0x60 to Address
Wait 150 us
Write 0x40 to Address
Read from Address
Data = 0x01
Protect Another
Sector
YES
TRYCNT = 25
NO
Increment TRYCNT
NO
YES
DEVICE FAILURE
YES
NO
RESET# = V
IH
Write Reset Command
SECTOR PROTECT
COMPLETE
TRYCNT = 1
Set Address:
A[17:12] = Sector to Protect
A[6] = 0, A[1] = 1, A[0] = 0
Figure 1. Sector Protect Algorithm
protection must be protected again after the un-
protect procedure is run.
The Sector Unprotect procedure requires V
ID
on
the RESET# pin and uses standard microproces-
sor bus cycle timing to implement sector unpro-
tection. The flow chart in Figure 2 illustrates the
algorithm.
Temporary Sector Unprotect Operation
This feature allows temporary unprotection of pre-
viously protected sectors to allow changing the
data in-system. Sector Unprotect mode is activated
by setting the RESET# pin to V
ID
. While in this
mode, formerly protected sectors can be pro-
grammed or erased by invoking the appropriate
commands (see Device Commands section).
Once V
ID
is removed from RESET#, all the previ-
ously protected sectors are protected again. Fig-
ure 3 illustrates the algorithm.
Electronic ID Operation (High Voltage Method)
The Electronic ID mode provides manufacturer and
device identification and sector protection verifi-
cation through codes output on DQ[15:0]. This
mode is intended primarily for programming equip-
ment to automatically match a device to be pro-
相關(guān)PDF資料
PDF描述
HY29LV400TT90 4 Mbit (512K x 8/256K x 16) Low Voltage Flash Memory
HY29LV400TT90I 4 Mbit (512K x 8/256K x 16) Low Voltage Flash Memory
HY29LV800 8 Mbit (1M x 8/512K x 16) Low Voltage Flash Memory
HY29LV800B-55 8 Mbit (1M x 8/512K x 16) Low Voltage Flash Memory
HY29LV800B-55I 8 Mbit (1M x 8/512K x 16) Low Voltage Flash Memory
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HY29LV400TT90 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:4 Mbit (512K x 8/256K x 16) Low Voltage Flash Memory
HY29LV400TT90I 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:4 Mbit (512K x 8/256K x 16) Low Voltage Flash Memory
HY29LV800 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8 Mbit (1M x 8/512K x 16) Low Voltage Flash Memory
HY29LV800B-55 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8 Mbit (1M x 8/512K x 16) Low Voltage Flash Memory
HY29LV800B-55I 制造商:HYNIX 制造商全稱:Hynix Semiconductor 功能描述:8 Mbit (1M x 8/512K x 16) Low Voltage Flash Memory
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