M29F800FB5AN6E2 View Datasheet(PDF) - Micron Technology
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M29F800FB5AN6E2 Datasheet PDF : 55 Pages
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M29FxxxFT/B
Block Protection Operations
Notes: 1. Address Inputs A[9:12] give the address of the block that is to be protected. It is impera-
tive that they remain stable during the operation.
2. During the protect and verify phases of the algorithm, CE# must be kept LOW.
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 microprocessor bus, therefore this technique is suitable for use af-
ter the Flash memory has been fitted to the system.
To protect a block follow the In-System Equipment Block Protect flowchart . To unpro-
tect the whole chip it is necessary to protect all of the blocks first, then all the blocks can
be unprotected at the same time. To unprotect the chip follow the In-System Equip-
ment 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 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.
Figure 19: Block Protect Flowchart – In-System Equipment
Setup
START
n=0
RST# = VID
WRITE 60h
ADDRESS = BLOCK ADDRESS
A0 = VIL , A1 = VIH , A6 = VIL
Protect
WRITE 60h
ADDRESS = BLOCK ADDRESS
A0 = VIL , A1 = VIH , A6 = VIL
Wait 100µs
Verify
WRITE 40h
ADDRESS = BLOCK ADDRESS
A0 = VIL , A1 = VIH , A6 = VIL
Wait 4µs
READ DATA
ADDRESS = BLOCK ADDRESS
A0 = VIL , A1 = VIH , A6 = VIL
End
DATA
No
=
01h
Yes
RST# = VIH
ISSUE READ/RESET
COMMAND
PASS
++n
No
= 25
Yes
RST# = VIH
ISSUE READ/RESET
COMMAND
FAIL
PDF: 09005aef845656da
m29fxxxf/t_2mb-16mb.pdf - Rev. B 2/14 EN
34
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