參數(shù)資料
型號： M29DW324DT90ZA6F
廠商： STMICROELECTRONICS
元件分類： PROM
英文描述： 2M X 16 FLASH 3V PROM, 90 ns, PBGA63
封裝： 7 X 11 MM, 0.80 MM PITCH, LEAD FREE, TFBGA-63
文件頁數(shù)： 39/50頁
文件大?。?/td> 878K
代理商： M29DW324DT90ZA6F
M29DW324DT, M29DW324DB
44/50
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., Tables 22 and 23 for details of the
Protection Groups. Once protected, Program 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.
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 (VID) 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
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 23., Programmer
VIH or VIL, 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(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
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 25., In-System
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 VIH or at VID when using the In-Sys-
tem Technique to protect the Extended Block.
Table 31. Programmer Technique Bus Operations, BYTE = VIH or VIL
Note: 1. Block Protection Groups are shown in APPENDIX D., Tables 22 and 23.
Operation
E
G
W
Address Inputs
A0-A20
Data Inputs/Outputs
DQ15A–1, DQ14-DQ0
Block (Group)
Protect(1)
VIL
VID
VIL Pulse
A9 = VID, A12-A20 Block Address
Others = X
X
Chip Unprotect
VID
VIL Pulse
A9 = VID, A12 = VIH, A15 = VIH
Others = X
X
Block (Group)
Protection Verify
VIL
VIH
A0 = VIL, A1 = VIH, A6 = VIL, A9 = VID,
A12-A20 Block Address
Others = X
Pass = XX01h
Retry = XX00h
Block (Group)
Unprotection Verify
VIL
VIH
A0 = VIL, A1 = VIH, A6 = VIH, A9 = VID,
A12-A20 Block Address
Others = X
Retry = XX01h
Pass = XX00h
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