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 Only 16-Bit Only
DQ[15]/A-1,
CE# OE# WE# A[MAX:4] A3 A2 A1 A0 DQ[15]/A-1 DQ[14:8] DQ[7:0] DQ[14:0]
8-Bit/16-Bit
8-Bit Only
Read Cycle
Manufacturer code
Device code 1
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
L
H
L
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
L
L
L
Device
code 2
256Mb
512Mb
1Gb
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
2Gb
L
Device code 3
H
1. H = Logic level HIGH (VIH); L = Logic level LOW (VIL); X = HIGH or LOW.
Note:
Table 13: Block Protection
Note 1 applies to entire table
Address Input
8-Bit/16-Bit
Data Input/Output
8-Bit Only
8-Bit Only
16-Bit Only
DQ[15]/A-1,
CE# OE# WE# A[MAX:16] A[15:2] A1 A0 DQ[15]/A-1 DQ[14:8] DQ[7:0] DQ[14:0]
Read Cycle
Extended M29EWL
memory
L
L
H
L
L
H
H
X
X
89h2
09h3
99h2
19h3
0089h2
0009h3
0099h2
0019h3
Block
M29EWH
protection
L
L
H
L
L
H
H
X
X
indicator
(DQ7)
Block protection
status
L
L
H
Block base
address
L
H
L
X
X
01h4
00h5
0001h4
0000h5
1. H = Logic level HIGH (VIH); L = Logic level LOW (VIL); X = HIGH or LOW.
2. Micron-prelocked (permanent).
Notes:
3. Customer-lockable.
4. 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
Micron Technology, Inc. reserves the right to change products or specifications without notice.
27
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MICRON [ MICRON TECHNOLOGY ]
