256Mb, 3V Multiple I/O Serial Flash Memory
Nonvolatile Configuration Register
Nonvolatile Configuration Register
This register is read from and written to using the READ NONVOLATILE CONFIGURA-
TION REGISTER and the WRITE NONVOLATILE CONFIGURATION REGISTER com-
mands, respectively. A register download is executed during power-on or after reset,
overwriting the internal configuration register settings that determine device behavior.
Table 7: Nonvolatile Configuration Register
Bit Name
Settings
Description
Notes
15:12 Number of
0000 = Identical to 1111
Sets the number of dummy clock cycles subse-
quent to all FAST READ commands.
(See the Command Set Table for default setting
values.)
1
dummy clock cy- 0001 = 1
cles
0010 = 2
⋮
1101 = 13
1110 = 14
1111 = Default
11:9 XIP mode at
power-on reset
000 = XIP: Fast read
Enables the device to operate in the selected XIP
mode immediately after power-on reset.
001 = XIP: Dual output fast read
010 = XIP: Dual I/O fast read
011 = XIP: Quad output fast read
100 = XIP: Quad I/O fast read
101 = Reserved
110 = Reserved
111 = Disabled (Default)
8:6 Output driver
strength
000 = Reserved
001 = 90 Ohms
010 = Reserved
011 = 45 Ohms
100 = Reserved
101 = 20 Ohms
110 = Reserved
111 = 30 Ohms (Default)
Optimizes the impedance at VCC/2 output volt-
age.
5
4
3
2
1
Double transfer
rate protocol
0 = Enabled
1 = Disabled (Default)
Set DTR protocol as current one. Once enabled,
all commands will work in DTR.
Reset/hold
0 = Disabled
1 = Enabled (Default)
Enables or disables HOLD# or RESET# on DQ3.
Quad I/O
protocol
0 = Enabled
1 = Disabled (Default)
Enables or disables quad I/O command input
(4-4-4 mode).
2
2
Dual I/O
protocol
0 = Enabled
1 = Disabled (Default)
Enables or disables dual I/O command input
(2-2-2 mode).
128Mb
segment select
0 = Highest 128Mb segment
1 = Lowest 128Mb segment (De-
fault)
Selects the power-on default 128Mb segment for
3-byte address operations. See also the extended
address register.
CCMTD-1725822587-3368
mt25q-qljs-L256-ABA-xxT.pdf - Rev. K 07/18 EN
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© 2014 Micron Technology, Inc. All rights reserved.
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