參數(shù)資料
型號: M29W640DB90ZA1F
廠商: 意法半導(dǎo)體
英文描述: Low-Power Single Inverter Buffer/Driver with Open-Drain Outputs 5-SOT-23 -40 to 85
中文描述: 64兆位和8Mb x8或4Mb的x16插槽,啟動塊3V電源快閃記憶體
文件頁數(shù): 43/49頁
文件大?。?/td> 945K
代理商: M29W640DB90ZA1F
43/49
M29W640DT, M29W640DB
APPENDIX D. BLOCK PROTECTION
Block protection can be used to prevent any oper-
ation from modifying the data stored in the memo-
ry. The blocks are protected in groups, refer to
APPENDIX A.
,
Table 19.
and
Table 20.
for details
of the Protection Groups. Once protected, Pro-
gram and Erase operations within the protected
group fail to change the data.
There are three techniques that can be used to
control Block Protection, these are the Program-
mer technique, the In-System technique and Tem-
porary Unprotection. Temporary Unprotection is
controlled by the Reset/Block Temporary Unpro-
tection pin, RP; this is described in the Signal De-
scriptions section.
Programmer Technique
The Programmer technique uses high (V
ID
) volt-
age levels on some of the bus pins. These cannot
be achieved using a standard microprocessor bus,
therefore the technique is recommended only for
use in Programming Equipment.
To protect a group of blocks follow the flowchart in
Figure 16., Programmer Equipment Group Protect
Flowchart
. To unprotect the whole chip it is neces-
sary to protect all of the groups first, then all
groups can be unprotected at the same time. To
unprotect the chip follow
Figure 17., Programmer
Equipment Chip Unprotect Flowchart
.
Table
28., Programmer Technique Bus Operations,
BYTE = V
IH
or V
IL
, gives a summary of each oper-
ation.
The timing on these flowcharts is critical. Care
should be taken to ensure that, where a pause is
specified, it is followed as closely as possible. Do
not abort the procedure before reaching the end.
Chip Unprotect can take several seconds and a
user message should be provided to show that the
operation is progressing.
In-System Technique
The In-System technique requires a high voltage
level on the Reset/Blocks Temporary Unprotect
pin, RP
(1)
. This can be achieved without violating
the maximum ratings of the components on the mi-
croprocessor bus, therefore this technique is suit-
able for use after the memory has been fitted to
the system.
To protect a group of blocks follow the flowchart in
Figure 18., In-System Equipment Group Protect
Flowchart
. To unprotect the whole chip it is neces-
sary to protect all of the groups first, then all the
groups can be unprotected at the same time. To
unprotect the chip follow
Figure 19., In-System
Equipment Chip Unprotect Flowchart
.
The timing on these flowcharts is critical. Care
should be taken to ensure that, where a pause is
specified, it is followed as closely as possible. Do
not allow the microprocessor to service interrupts
that will upset the timing and do not abort the pro-
cedure before reaching the end. Chip Unprotect
can take several seconds and a user message
should be provided to show that the operation is
progressing.
Note: 1. RP can be either at V
IH
or at V
ID
when using the In-Sys-
tem Technique to protect the Extended Block.
Table 28. Programmer Technique Bus Operations, BYTE = V
IH
or V
IL
Note: 1. Block Protection Groups are shown in
APPENDIX A.
, Tables
19
and
20
.
Operation
E
G
W
Address Inputs
A0-A21
Data Inputs/Outputs
DQ15A–1, DQ14-DQ0
Block (Group)
Protect
(1)
V
IL
V
ID
V
IL
Pulse
A9 = V
ID
, A12-A21 Block Address
Others = X
X
Chip Unprotect
V
ID
V
ID
V
IL
Pulse
A9 = V
ID
, A12 = V
IH
, A15 = V
IH
Others = X
X
Block (Group)
Protection Verify
V
IL
V
IL
V
IH
A0 = V
IL
, A1 = V
IH
, A6 = V
IL
, A9 = V
ID
,
A12-A21 Block Address
Others = X
Pass = XX01h
Retry = XX00h
Block (Group)
Unprotection Verify
V
IL
V
IL
V
IH
A0 = V
IL
, A1 = V
IH
, A6 = V
IH
, A9 = V
ID
,
A12-A21 Block Address
Others = X
Retry = XX01h
Pass = XX00h
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