32Mb, 64Mb, 128Mb: 3V Embedded Parallel NOR Flash
Bypass Operations
Table 19: Block Protection
Note 1 applies to entire table
Address Input
8-Bit/16-Bit
Data Input/Output
16-Bit
Only
8-Bit
Only
8-Bit Only
Read Cycle
CE# OE# WE# A[MAX:15] A[14:11] A[10:2] A1 A0 A-1 DQ[14:8] DQ[7:0] DQ[15:0]
Extended
memory
Block
protection
indicator
(DQ7)
M29EWL
128Mb
L
L
L
L
L
L
H
H
H
X
X
X
X
X
X
L
L
L
H
H
H
H
H
H
X
X
X
X
X
X
89h2
09h3
99h2
19h3
8Ah2
0Ah3
0089h2
0009h3
0099h2
0019h3
008Ah2
000Ah3
M29EWH
128Mb
M29EWL
64Mb
32Mb
M29EWH
64Mb
32Mb
L
L
L
L
L
L
L
H
H
H
H
X
X
X
X
X
X
L
L
L
L
L
H
H
H
H
H
H
H
L
X
X
X
X
X
X
X
X
9Ah2
1Ah3
009Ah2
001Ah3
M29EWB
64Mb
32Mb
8Ah2
0Ah3
008Ah2
000Ah3
M29EWT
64Mb
32Mb
9Ah2
1Ah3
009Ah2
001Ah3
Block protection
status
L
Block base
address6
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].
5. Unprotected: 00h (in x8 mode) is output on DQ[7:0].
6. Block base address for 128Mb device, should be A[MAX:16], while A15 = X.
Bypass Operations
UNLOCK BYPASS Command
The UNLOCK BYPASS (20h) command is used to place the device in unlock bypass
mode. Three bus WRITE operations are required to issue the UNLOCK BYPASS com-
mand.
When the device enters unlock bypass mode, the two initial UNLOCK cycles required
for a standard PROGRAM or ERASE operation are not needed, thus enabling faster total
program or erase time.
The UNLOCK BYPASS command is used in conjunction with UNLOCK BYPASS PRO-
GRAM or UNLOCK BYPASS ERASE commands to program or erase the device faster
than with standard PROGRAM or ERASE commands. When the cycle time to the device
PDF: 09005aef84dc44a7
m29ew_32Mb-128Mb.pdf - Rev. B 11/12 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
35
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