256Mb and 512Mb (256Mb/256Mb), P30-65nm
Bus Operations
Standby
When CE# is deasserted the device is deselected and placed in standby, substantially re-
ducing power consumption. In standby, the data outputs are placed in High-Z, inde-
pendent of the level placed on OE#. Standby current, I
CCS
, is the average current meas-
ured over any 5 ms time interval, 5μs after CE# is deasserted. During standby, average
current is measured over the same time interval 5μs after CE# is deasserted.
When the device is deselected (while CE# is deasserted) during a program or erase oper-
ation, it continues to consume active power until the program or erase operation is
completed.
Reset
As with any automated device, it is important to assert RST# when the system is reset.
When the system comes out of reset, the system processor attempts to read from the
flash memory if it is the system boot device. If a CPU reset occurs with no flash memory
reset, improper CPU initialization may occur because the flash memory may be provid-
ing status information rather than array data. Flash memory devices from Micron allow
proper CPU initialization following a system reset through the use of the RST# input.
RST# should be controlled by the same low-true reset signal that resets the system CPU.
After initial power-up or reset, the device defaults to asynchronous Read Array mode,
and the Status Register is set to 0x80. Asserting RST# de-energizes all internal circuits,
and places the output drivers in High-Z. When RST# is asserted, the device shuts down
the operation in progress, a process which takes a minimum amount of time to com-
plete. When RST# has been deasserted, the device is reset to asynchronous Read Array
state.
When device returns from a reset (RST# deasserted), a minimum wait is required before
the initial read access outputs valid data. Also, a minimum delay is required after a reset
before a write cycle can be initiated. After this wake-up interval passes, normal opera-
tion is restored.
Note:
If RST# is asserted during a program or erase operation, the operation is termina-
ted and the memory contents at the aborted location (for a program) or block (for an
erase) are no longer valid, because the data may have been only partially written or
erased.
PDF: 09005aef84566799
p30_65nm_256Mb-512mb.pdf - Rev. A 1/13 EN
24
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