256Mb, 512Mb, 1Gb, 2Gb: 3V Embedded Parallel NOR Flash
Block Protection Command Definitions – Address-Data Cycles
Table 14: Block Protection Command Definitions – Address-Data Cycles, 8-Bit and 16-Bit (Continued)
Notes 1 and 2 apply to entir e table
Address and Data Cycles
Command and
Bus
1st
2nd
3rd
4th
n th
Code/Subcode
Size
A
D
A
D
A
D
A
D
A
D
Notes
READ NONVOLATILE
PROTECTION BIT LOCK BIT
STATUS
x8
x16
X
READ(0)
4, 6,
11
VOLATILE PROTECTION Commands
ENTER VOLATILE
x8
AAA
AA
555
55
AAA
E0
3
PROTECTION COMMAND
SET (E0h)
PROGRAM VOLATILE
x16
x8
555
X
AA
A0
2AA
BAd
55
00
555
11
PROTECTION BIT (A0h)
x16
READ VOLATILE
x8
BAd
READ(0)
4, 6
PROTECTION BIT STATUS
x16
CLEAR VOLATILE
x8
X
A0
BAd
01
11
PROTECTION BIT (A0h)
x16
EXTENDED MEMORY BLOCK Commands
ENTER EXTENDED
MEMORY BLOCK (88h)
x8
x16
AAA
555
AA
AA
555
2AA
55
55
AAA
555
88
3
EXIT EXTENDED
x8
AAA
AA
555
55
AAA
90
X
00
MEMORY BLOCK (90/00h)
x16
555
AA
2AA
55
555
EXIT PROTECTION Commands
EXIT PROTECTION
x8
X
90
X
00
3
COMMAND SET (90/00h)
Notes:
x16
1. Key: A = Address and D = Data; X = "Don’t Care;" BAd = any address in the block; PWDn
= password bytes 0 to 7; PWAn = password address, n = 0 to 7; Gray = not applicable. All
values in the table are hexadecimal.
2. DQ[15:8] are "Don’t Care" during UNLOCK and COMMAND cycles. A[MAX:16] are
"Don’t Care" during UNLOCK and COMMAND cycles, unless an address is required.
3. The ENTER command sequence must be issued prior to any operation. It disables READ
and WRITE operations from and to block 0. READ and WRITE operations from and to
any other block are allowed. Also, when an ENTER COMMAND SET command is issued,
an EXIT PROTECTION COMMAND SET command must be issued to return the device to
READ mode.
4. READ REGISTER/PASSWORD commands have no command code; CE# and OE# are driven
LOW and data is read according to a specified address.
5. Data = Lock register content.
6. All address cycles shown for this command are READ cycles.
7. Only one portion of the password can be programmed or read by each PROGRAM PASS-
WORD command.
8. Each portion of the password can be entered or read in any order as long as the entire
64-bit password is entered or read.
PDF: 09005aef849b4b09
m29ew_256mb_2gb.pdf - Rev. B 8/12 EN
38
Micron Technology, Inc. reserves the right to change products or specifications without notice.
? 2012 Micron Technology, Inc. All rights reserved.
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