S71GL064A Datasheet, PDF (60/134 Pages) SPANSION – STACKED MULTI CHIP PRODUCT FLASH MEMORY AND RAM

Advance Information
DQ3: Sector Erase Timer
After writing a sector erase command sequence, the system may read DQ3 to determine
whether or not erasure has begun. (The sector erase timer does not apply to the chip erase
command.) If additional sectors are selected for erasure, the entire time-out also applies after
each additional sector erase command. When the time-out period is complete, DQ3 switches
from a “0” to a “1.” If the time between additional sector erase commands from the system
can be assumed to be less than 50 µs, the system need not monitor DQ3. See also the Sector
Erase Command Sequence section.
After the sector erase command is written, the system should read the status of DQ7 (Data#
Polling) or DQ6 (Toggle Bit I) to ensure that the device has accepted the command sequence,
and then read DQ3. If DQ3 is “1,” the Embedded Erase algorithm has begun; all further com-
mands (except Erase Suspend) are ignored until the erase operation is complete. If DQ3 is
“0,” the device will accept additional sector erase commands. To ensure the command has
been accepted, the system software should check the status of DQ3 prior to and following
each subsequent sector erase command. If DQ3 is high on the second status check, the last
command might not have been accepted.
Table 11 shows the status of DQ3 relative to the other status bits.
DQ1: Write-to-Buffer Abort
DQ1 indicates whether a Write-to-Buffer operation was aborted. Under these conditions DQ1
produces a “1”. The system must issue the Write-to-Buffer-Abort-Reset command sequence
to return the device to reading array data. See Write Buffer section for more details.
Table 11. Write Operation Status
Status
DQ7
(Note 2)
DQ6
DQ5
(Note 1) DQ3
DQ2
(Note 2)
Standard ^{Embedded Program Algorithm}
Mode _{Embedded Erase Algorithm}
DQ7#
0
Toggle
Toggle
0
N/A No toggle
0
1
Toggle
Program
Suspend
Mode
Program-
Suspend
Read
Program-Suspended
Sector
Non-Program
Suspended Sector
Invalid (not allowed)
Data
Erase
Suspend
Mode
Erase-
Suspend
Read
Erase-Suspended
Sector
Non-Erase
Suspended Sector
Erase-Suspend-Program
(Embedded Program)
1
No toggle
DQ7# Toggle
0
N/A
Data
0
N/A
Toggle
N/A
Write-to- ^{Busy (Note 3)}
Buffer _{Abort (Note 4)}
DQ7#
DQ7#
Toggle
Toggle
0
N/A
N/A
0
N/A
N/A
DQ1 RY/BY#
0
0
N/A
0
1
1
N/A
1
1
N/A
0
0
0
1
0
Notes:
1. DQ5 switches to ‘1’ when an Embedded Program, Embedded Erase, or Write-to-Buffer operation has exceeded the maximum timing limits.
Refer to the section on DQ5 for more information.
2. DQ7 and DQ2 require a valid address when reading status information. Refer to the appropriate subsection for further details.
3. The Data# Polling algorithm should be used to monitor the last loaded write-buffer address location.
4. DQ1 switches to ‘1’ when the device has aborted the write-to-buffer operation.
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S71GL064A based MCPs
S71GL064A_00_A2 February 8, 2005