512Mb, Multiple I/O Serial Flash Memory
Nonvolatile and Volatile Registers
2. The 0000 and 1111 settings are identical in that they both define the default state,
which is the maximum frequency of fc = 108 MHz. This ensures backward compatibility.
3. If the number of dummy clock cycles is insufficient for the operating frequency, the
memory reads wrong data. 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 Frequencies table.
4. If bits 2 and 3 are both set to 0, the device operates in quad I/O. When bits 2 or 3 are
reset to 0, the device operates in dual I/O or quad I/O respectively, after the next power-
on.
Table 11: Volatile Configuration Register Bit Definitions
Note 1 applies to entire table
Bit
Name
Settings
Description
Notes
7:4
Number of dum- 0000 (identical to 1111)
Sets the number of dummy clock cycles subsequent to
all FAST READ commands.
The default setting targets maximum allowed frequen-
cy and guarantees backward compatibility.
2, 3
my clock cycles
0001
0010
.
.
1101
1110
1111
3
XIP
0
1
Enables or disables XIP. For device part numbers with
feature digit equal to 2 or 4, this bit is always "Don’t
Care," so the device operates in XIP mode without set-
ting this bit.
2
Reserved
Wrap
x = Default
0b = Fixed value.
1:0
00 = 16-byte boundary
aligned
16-byte wrap: Output data wraps within an aligned 16-
byte boundary starting from the address (3-byte or 4-
byte) issued after the command code.
4
01 = 32-byte boundary
aligned
32-byte wrap: Output data wraps within an aligned 32-
byte boundary starting from the address (3-byte or 4-
byte) 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 address (3-byte or 4-
byte) issued after the command code.
11 = sequential (default)
Continuous reading (default): All bytes are read se-
quentially.
1. Settings determine the device memory configuration upon a change of those settings by
the WRITE VOLATILE CONFIGURATION REGISTER command. The register is read from or
written to by READ VOLATILE CONFIGURATION REGISTER or WRITE VOLATILE CONFIGU-
RATION REGISTER commands respectively.
Notes:
2. The 0000 and 1111 settings are identical in that they both define the default state,
which is the maximum frequency of fc = 108 MHz. This ensures backward compatibility.
3. If the number of dummy clock cycles is insufficient for the operating frequency, the
memory reads wrong data. The number of cycles must be set according to and be suffi-
cient for the clock frequency, which varies by the type of FAST READ command, as
shown in the Supported Clock Frequencies table.
4. See the Sequence of Bytes During Wrap table.
PDF: 09005aef84752721
n25q_512mb_1ce_3V_65nm.pdf - Rev. O 05/13 EN
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