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 entire table
Address and Data Cycles
1st
2nd
3rd
4th
nth
Command and
Code/Subcode
Bus
Size
A
D
A
D
A
D
A
D
…
A
D
Notes
READ NONVOLATILE
PROTECTION BIT LOCK BIT
STATUS
x8
X
READ(0)
4, 6,
11
x16
VOLATILE PROTECTION Commands
ENTER VOLATILE
PROTECTION COMMAND
SET (E0h)
x8
AAA
555
AA
AA
555
55
55
AAA
555
E0
3
x16
2AA
PROGRAM VOLATILE
PROTECTION BIT (A0h)
x8
x16
x8
X
A0
BAd
00
11
4, 6
11
READ VOLATILE
PROTECTION BIT STATUS
BAd READ(0)
x16
x8
CLEAR VOLATILE
X
A0
BAd
01
PROTECTION BIT (A0h)
x16
EXTENDED MEMORY BLOCK Commands
ENTER EXTENDED
MEMORY BLOCK (88h)
x8
x16
x8
AAA
555
AA
AA
AA
AA
555
2AA
555
55
55
55
55
AAA
555
88
90
3
EXIT EXTENDED
MEMORY BLOCK (90/00h)
AAA
555
AAA
555
X
00
x16
2AA
EXIT PROTECTION Commands
EXIT PROTECTION
COMMAND SET (90/00h)
x8
x16
X
90
X
00
3
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.
Notes:
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
Micron Technology, Inc. reserves the right to change products or specifications without notice.
38
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