
256Mb, 512Mb, 1Gb, 2Gb: 3V Embedded Parallel NOR Flash
READ and AUTO SELECT Operations
Auto select mode is exited by performing a reset. The device returns to read mode un-
less it entered auto select mode after an ERASE SUSPEND or PROGRAM SUSPEND
command, in which case it returns to erase or program suspend mode.
Table 12: Read Electronic Signature
Note 1 applies to entire table
Address Input
Data Input/Output
8-Bit/16-Bit
8-Bit Only
8-Bit Only
16-Bit Only
DQ[15]/A-1,
Read Cycle
CE#
OE#
WE#
A[MAX:4] A3
A2
A1
A0 DQ[15]/A-1 DQ[14:8] DQ[7:0]
DQ[14:0]
Manufacturer code
Device code 1
L
L
L
L
H
H
L
L
L
L
L
L
L
L
L
H
X
X
X
X
89h
7Eh
0089h
227Eh
Device
code 2
256Mb
512Mb
L
L
L
L
H
H
L
L
H
H
H
H
H
H
L
L
X
X
X
X
22h
23h
2222h
2223h
1Gb
2Gb
Device code 3
L
L
L
L
L
L
H
H
H
L
L
L
H
H
H
H
H
H
H
H
H
L
L
H
X
X
X
X
X
X
28h
48h
01h
2228h
2248h
2201h
Note:
1. H = Logic level HIGH (V IH ); L = Logic level LOW (V IL ); X = HIGH or LOW.
Table 13: Block Protection
Note 1 applies to entir e table
Address Input
Data Input/Output
8-Bit/16-Bit
8-Bit Only
8-Bit Only
16-Bit Only
DQ[15]/A-1,
Read Cycle
CE# OE# WE# A[MAX:16] A[15:2] A1
A0 DQ[15]/A-1 DQ[14:8] DQ[7:0]
DQ[14:0]
Extended
memory
Block
protection
indicator
M29EWL
M29EWH
L
L
L
L
H
H
L
L
L
L
H
H
H
H
X
X
X
X
89h 2
09h 3
99h 2
19h 3
0089h 2
0009h 3
0099h 2
0019h 3
(DQ7)
Block protection
L
L
H
Block base
L
H
L
X
X
01h 4
0001h 4
status
address
00h 5
0000h 5
Notes:
1.
2.
3.
4.
H = Logic level HIGH (V IH ); L = Logic level LOW (V IL ); X = HIGH or LOW.
Micron-prelocked (permanent).
Customer-lockable.
Protected: 01h (in x8 mode) is output on DQ[7:0]; indicates that the extended memory
block is permanently prelocked by Micron.
5. Unprotected: 00h (in x8 mode) is output on DQ[7:0]; indicates that the extended memo-
ry block can be locked by customer.
PDF: 09005aef849b4b09
m29ew_256mb_2gb.pdf - Rev. B 8/12 EN
27
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? 2012 Micron Technology, Inc. All rights reserved.