256Mb: 3V Embedded Parallel NOR Flash
AUTO SELECT Operations
Table 11: Block Protection
Note 1 applies to entire table
Read Cycle
Block Protection
Signal
GL
L
GH
L
Status
Notes
CE#
L
L
OE#
L
L
WE#
H
H
H
Address Input, 8-Bit and 16-Bit
A[MAX:16]
X
X
X
X
Block base address
A[15:10]
X
VID
X
A9
VID
X
VID
X
2
A8
A[7:5]
L
L
L
A4
X
X
X
A[3:2]
L
L
L
A1
H
H
H
H
H
L
A0
Address Input, 8-Bit Only
DQ[15]/A-1
X
X
X
Data Input/Output, 8-Bit Only
DQ[14:8]
X
X
X
DQ[7:0]
89h
09h
99h
19h
01h
00h
3, 5
4, 6
Data Input/Output, 16-Bit Only
DQ[15]/A-1, and DQ[14:0]
0089h
0009h
0099h
0019h
0001h
0000h
3, 5
4, 6
1. Read cycle output to DQ7 = Extended memory block protection indicator; GL = High
block protection; GH = Low block protection; BPS = Block protection status; H = Logic
level HIGH (VIH); L = Logic level LOW (VIL); X = HIGH or LOW.
Notes:
2. When using the AUTO SELECT command to enter auto select mode, applying VID to A9 is
not required. A9 can be either VIL or VIH.
3. GL and GH devices are Micron-prelocked (permanent).
4. GL and GH devices are customer-lockable.
5. Block protection status = protected: 01h (in x8 mode) is output on DQ[7:0]; indicates
that the extended memory block is permanently prelocked by Micron.
6. Block protection status = unprotected: 00h (in x8 mode) is output on DQ[7:0]; indicates
that the extended memory block can be locked by customer.
PDF: 09005aef84bd3b68
m29w_256mb.pdf - Rev. B 5/13 EN
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