AM29F002BB-90JE データシートの表示（PDF） - Advanced Micro Devices
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AM29F002BB-90JE
Advanced Micro Devices
AM29F002BB-90JE Datasheet PDF : 40 Pages
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interrupts can be re-enabled after the last Sector Erase
command is written. If the time between additional
sector erase commands can be assumed to be less
than 50 µs, the system need not monitor DQ3. Any
command other than Sector Erase or Erase
Suspend during the time-out period resets the
device to reading array data. The system must
rewrite the command sequence and any additional
sector addresses and commands.
The system can monitor DQ3 to determine if the sector
erase timer has timed out. (See the “DQ3: Sector
Erase Timer” section.) The time-out begins from the
rising edge of the final WE# pulse in the command
sequence.
Once the sector erase operation has begun, only the
Erase Suspend command is valid. All other commands
are ignored. On the Am29F002B only, note that a hard-
ware reset during the sector erase operation
immediately terminates the operation. The Sector
Erase command sequence should be reinitiated once
the device has returned to reading array data, to
ensure data integrity.
When the Embedded Erase algorithm is complete, the
device returns to reading array data and addresses are
no longer latched. The system can determine the
status of the erase operation by using DQ7, DQ6, or
DQ2. Refer to “Write Operation Status” for information
on these status bits.
Figure 3 illustrates the algorithm for the erase opera-
tion. Refer to the Erase/Program Operations tables in
the “AC Characteristics” section for parameters, and to
the Sector Erase Operations Timing diagram for timing
waveforms.
START
Write Erase
Command Sequence
Data Poll
from System
No
Data = FFh?
Embedded
Erase
algorithm
in progress
Yes
Erasure Completed
Notes:
1. See the appropriate Command Definitions table for erase
command sequence.
2. See “DQ3: Sector Erase Timer” for more information.
Figure 3. Erase Operation
14
Am29F002B/Am29F002NB
November 28, 2000
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