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
8-Bit/16-Bit
Read Cycle
Manufacturer code
Device code 1
Device
code 2
256Mb
512Mb
1Gb
2Gb
Device code 3
CE#
L
L
L
L
L
L
L
Note:
OE#
L
L
L
L
L
L
L
WE#
H
H
H
H
H
H
H
A[MAX:4] A3
L
L
L
L
L
L
L
L
L
H
H
H
H
H
A2
L
L
H
H
H
H
H
A1
L
L
H
H
H
H
H
8-Bit Only
Data Input/Output
8-Bit Only
16-Bit Only
DQ[15]/A-1,
A0 DQ[15]/A-1 DQ[14:8] DQ[7:0] DQ[14:0]
L
H
L
L
L
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
89h
7Eh
22h
23h
28h
48h
01h
0089h
227Eh
2222h
2223h
2228h
2248h
2201h
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 entire table
Address Input
8-Bit/16-Bit
Read Cycle
Extended M29EWL
memory
Block
M29EWH
protection
indicator
(DQ7)
Block protection
status
CE# OE# WE# A[MAX:16] A[15:2] A1
L
L
L
L
H
H
L
L
L
L
H
H
8-Bit Only
Data Input/Output
8-Bit Only
16-Bit Only
DQ[15]/A-1,
A0 DQ[15]/A-1 DQ[14:8] DQ[7:0]
DQ[14:0]
H
H
X
X
X
X
89h
09h
99h
19h
0089h
0009h
0099h
0019h
0001h
0000h
L
L
H
Block base
address
L
H
L
X
X
01h
00h
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.
MICRON [ MICRON TECHNOLOGY ]
