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M29W128GH70N3F View Datasheet(PDF) - Numonyx -> Micron

Part Name
Description
MFG CO.
'M29W128GH70N3F' PDF : 94 Pages View PDF
Bus operations
M29W128GH, M29W128GL
3.5
Reset
During Reset mode the memory is deselected and the outputs are high impedance. The
memory is in Reset mode when RP is at VIL. The power consumption is reduced to the
standby level, independently from the Chip Enable, Output Enable or Write Enable inputs.
3.6
Automatic Standby
Automatic Standby allows the memory to achieve low power consumption during Read
mode.
After a read operation, if CMOS levels (VCC ± 0.3 V) are used to drive the bus and the bus is
inactive for tAVQV + 30 ns or more, the memory enters Automatic Standby where the internal
Supply current is reduced to the Standby Supply current, ICC2 (see Table 25: DC
characteristics). The Data inputs/outputs will still output data if a Bus Read operation is in
progress.
The power supplier of data bus, VCCQ, can have a null consumption (depending on load
circuits connected with data bus) when the memory enters Automatic Standby.
3.7
3.7.1
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:
programmer method:
Additional bus operations are used. They require VID to be applied to address pin A9.
Refer to Table 6, Table 7, Table 8, and Table 9 for a description of the bus operations
required to read the electronic signature using the programmer method
in-system method:
The Auto Select mode is entered by issuing the Auto Select command (see
Section 6.1.2). It is not necessary to apply VID to A9.
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 Section 6.1.6).
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.
Read electronic signature
The memory has two codes, the manufacturer code and the device code used to identify the
memory. These codes can be accessed by performing read operations with control signals
and addresses set as shown in Table 6: Read electronic signature - auto select mode -
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