m29dw256g Numonyx, m29dw256g Datasheet - Page 16

• Manufacturer Part Number: m29dw256g
• Description: 256-mbit X16, Multiple Bank, Page, Dual Boot 3 V Supply Flash Memory
• Manufacturer: Numonyx

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Reset
During reset mode the memory is deselected and the outputs are high impedance. The
memory is in reset mode when RP is at V
standby level, independently from the chip enable, output enable or write enable inputs.
Automatic standby
Automatic standby allows the memory to achieve low power consumption during read
mode.
After a read operation, if CMOS levels (V
inactive for t
supply current is reduced to the standby supply current, I
characteristics). The data inputs/outputs will still output data if a bus read operation is in
progress.
The power supplier of data bus, V
circuits connected with data bus) when the memory enters automatic standby.
Auto select mode
The auto select mode allows the system or the programming equipment to read the
electronic signature, verify the protection status of the extended memory block, and
apply/remove block protection. For example, this mode can be used by a programming
equipment to automatically match a device and the application code to be programmed.
There are two methods to enter auto select mode:
At power-up, the device is in read mode, and can then be put in auto select mode by using
one of the methods described above.
The device cannot enter auto select mode when a program or erase operation is ongoing
(RB Low). However, auto select mode can be entered if the erase operation has been
suspended by issuing an Erase Suspend command (see
The auto select mode is exited by performing a reset. The device is returned to read mode,
except if the auto select mode was entered after an Erase Suspend or a Program Suspend
command. In this case, it returns to the erase or program suspend mode.
programmer method:
Additional bus operations are used. They require V
Refer to
mode - programmer method
electronic signature using the programmer method
in-system method:
The auto select mode is entered by issuing the Auto Select command (see
Section
AVQV
6.1.2). It is not necessary to apply V
Table 5: Bus
+ 30 ns or more, the memory enters automatic standby where the internal
operations, and
for a description of the bus operations required to read the
CCQ
, can have a null consumption (depending on load
CC
IL
Table 6: Read electronic signature - auto select
. The power consumption is reduced to the
± 0.3 V) are used to drive the bus and the bus is
ID
to A9.
ID
CC2
Section
to be applied to address pin A9.
(see
6.1.6).
Table 22: DC