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| 型號： | M29F016D70M6T |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 16 Mbit (2Mb x8, Uniform Block) 5V Supply Flash Memory |
| 中文描述： | 16兆位（含2Mb × 8，統(tǒng)一座）5V電源快閃記憶體 |
| 文件頁數(shù)： | 31/37頁 |
| 文件大小： | 536K |
| 代理商： | M29F016D70M6T |
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M29F016D
APPENDIX C. 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 15 for details of the Protection
Groups. Once protected, Program and Erase op-
erations 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.
To protect the Extended Block issue the Enter Ex-
tended Block command and then use either the
Programmer or In-System technique. Once pro-
tected issue the Exit Extended Block command to
return to read mode. The Extended Block protec-
tion is irreversible, once protected the protection
cannot be undone.
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 14, Programmer Equipment Block 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 15, Programmer
Equipment Chip Unprotect Flowchart. Table 22,
Programmer Technique Bus Operations, gives a
summary of each operation.
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. This can be achieved without violating the
maximum ratings of the components on the micro-
processor bus, therefore this technique is suitable
for use after the memory has been fitted to the sys-
tem.
To protect a group of blocks follow the flowchart in
Figure 16, In-System Block Protect Flowchart. To
unprotect the whole chip it is necessary to protect
all of the groups first, then all the groups can be
unprotected at the same time. To unprotect the
chip follow Figure 17, In-System 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.
Table 22. Programmer Technique Bus Operations, BYTE = V
IH
or V
IL
Note: 1. Block Protection Groups are shown in Appendix A, Table 15.
Operation
E
G
W
Address Inputs
A0-A20
Data Inputs/Outputs
DQ15A–1, DQ14-DQ0
Block (Group)
Protect
(1)
V
IL
V
ID
V
IL
Pulse
A9 = V
ID
, A12-A20 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-A20 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-A20 Block Address
Others = X
Retry = XX01h
Pass = XX00h
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