512Mb, Multiple I/O Serial Flash Memory
ERASE Operations
byte output. When the operation completes, the program or erase controller bit is
cleared to 1.
If the operation times out, the write enable latch bit is reset and erase error bit is set to
1. If S# is not driven HIGH, the command is not executed, flag status register error bits
are not set, and the write enable latch remains set to 1. When a command is applied to a
protected sector, the command is not executed. Instead, the write enable latch bit re-
mains set to 1, and flag status register bits 1 and 5 are set.
Figure 31: SUBSECTOR and SECTOR ERASE Command
Extended
C
LSB
DQ0
Command
MSB
A[MAX]
0
C
LSB
DQ0[1:0]
Command
MSB
A[MAX]
0
C
LSB
DQ0[3:0]
MSB
Command
A[MAX]
A[MIN]
1
2
C
x
A[MIN]
3
4
C
x
A[MIN]
0
7
8
C
x
Dual
Quad
Note:
1. For extended SPI protocol, C
x
= 7 + (A[MAX] + 1).
For dual SPI protocol, C
x
= 3 + (A[MAX] + 1)/2.
For quad SPI protocol, C
x
= 1 + (A[MAX] + 1)/4.
DIE ERASE Command
To initiate the DIE ERASE command, the WRITE ENABLE command must be issued to
set the write enable latch bit to 1. S# is driven LOW and held LOW until the eighth bit of
the last data byte has been latched in, after which it must be driven HIGH. The com-
mand code is input on DQ0, followed by address bytes; any address within the single
256Mb die is valid. Each address bit is latched in during the rising edge of the clock.
When S# is driven HIGH, the operation, which is self-timed, is initiated; its duration is
t
DSE.
If the write enable latch bit is not set, the device ignores the DIE ERASE command and
no error bits are set to indicate operation failure.
When the operation is in progress, the program or erase controller bit is set to 0. The
write enable latch bit is cleared to 0, whether the operation is successful or not. The sta-
tus register and flag status register can be polled for the operation status. The operation
is considered complete once bit 7 of the flag status register outputs 1 with at least one
PDF: 09005aef84752721
n25q_512mb_1ce_3V_65nm.pdf - Rev. O 05/13 EN
61
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