256Mb, 3V Multiple I/O Serial Flash Memory
Volatile Configuration Register
Volatile Configuration Register
This register is read from and written to by the READ VOLATILE CONFIGURATION
REGISTER and the WRITE VOLATILE CONFIGURATION REGISTER commands, respec-
tively. A register download is executed after these commands, overwriting the internal
configuration register settings that determine device memory behavior.
Table 8: Volatile Configuration Register
Bit
Name
Settings
Description
Notes
7:4
Number of
dummy clock 0001 = 1
0000 = Identical to 1111
Sets the number of dummy clock cycles subsequent to all
FAST READ commands.
1
cycles
0010 = 2
⋮
(See the Command Set Table for default setting values.)
1101 = 13
1110 = 14
1111 = Default
3
XIP
0 = Enable
1 = Disable (Default)
Enables or disables XIP.
0b = Fixed value.
2
Reserved
Wrap
0
1:0
00 = 16-byte boundary
aligned
16-byte wrap: Output data wraps within an aligned 16-byte
boundary starting from the 3-byte address issued after the
command code.
2
01 = 32-byte boundary
aligned
32-byte wrap: Output data wraps within an aligned 32-byte
boundary starting from the 3-byte address issued after the
command code.
10 = 64-byte boundary
aligned
64-byte wrap: Output data wraps within an aligned 64-byte
boundary starting from the 3-byte address issued after the
command code.
11 = Continuous (Default) Continuously sequences addresses through the entire array.
1. The number of cycles must be set according to and sufficient for the clock frequency,
which varies by the type of FAST READ command, as shown in the Supported Clock Fre-
quencies table. An insufficient number of dummy clock cycles for the operating frequen-
cy causes the memory to read incorrect data.
Notes:
2. See the Sequence of Bytes During Wrap table.
Table 9: Sequence of Bytes During Wrap
Starting Address
16-Byte Wrap
32-Byte Wrap
64-Byte Wrap
0-1-2- . . . -63-0-1- . .
1-2- . . . -63-0-1-2- . .
....
0
0-1-2- . . . -15-0-1- . .
0-1-2- . . . -31-0-1- . .
1
1-2- . . . -15-0-1-2- . .
1-2- . . . -31-0-1-2- . .
....
15
....
31
....
63
....
....
15-0-1-2-3- . . . -15-0-1- . .
15-16-17- . . . -31-0-1- . .
15-16-17- . . . -63-0-1- . .
....
....
–
....
31-0-1-2-3- . . . -31-0-1- . .
31-32-33- . . . -63-0-1- . .
....
....
–
....
–
63-0-1- . . . -63-0-1- . .
CCMTD-1725822587-3368
mt25q-qljs-L256-ABA-xxT.pdf - Rev. K 07/18 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2014 Micron Technology, Inc. All rights reserved.
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