MX29F040
SECTOR ERASE COMMANDS
The Automatic Sector Erase does not require the
device to be entirely pre-programmed prior to
executing the Automatic Set-up Sector Erase
command and Automatic Sector Erase command.
Upon executing the Automatic Sector Erase
command, the device will automatically program and
verify the sector(s) memory for an all-zero data
pattern. The system is not required to provide any
control or timing during these operations.
When the sector(s) is automatically verified to contain
an all-zero pattern, a self-timed sector erase and
verify begin. The erase and verify operations are
complete when the data on Q7 is "1" and the data on
Q6 stops toggling for two consecutive read cycles, at
which time the device returns to the Read mode. The
system is not required to provide any control or timing
during these operations.
When using the Automatic Sector Erase algorithm,
note that the erase automatically terminates when
adequate erase margin has been achieved for the
memory array (no erase verification command is
required). Sector erase is a six-bus cycle operation.
There are two "unlock" write cycles. These are
followed by writing the set-up command 80H. Two
more "unlock" write cycles are then followed by the
sector erase command 30H. The sector address is
latched on the falling edge of WE or CE, whichever
happeds later, while the command(data) is latched on
the rising edge of WE or CE, whichever happeds first.
Sector addresses selected are loaded into internal
register on the sixth falling edge of WE or CE,
whichever happeds later. Each successive sector load
cycle started by the falling edge of WE or CE,
whichever happeds later must begin within 30us from
the rising edge of the preceding WE or CE, whichever
happeds first. Otherwise, the loading period ends and
internal auto sector erase cycle starts. (Monitor Q3 to
determine if the sector erase timer window is still
open, see section Q3, Sector Erase Timer.) Any
command other than Sector Erase(30H) or Erase
Suspend(B0H) during the time-out period resets the
device to read mode.
Table 4. Write Operation Status
Status
Q7
Note1
Byte Program in Auto Program Algorithm
Auto Erase Algorithm
Erase Suspend Read
In Progress
Erase Suspended Mode
(Erase Suspended Sector)
Erase Suspend Read
(Non-Erase Suspended Sector)
Erase Suspend Program
Byte Program in Auto Program Algorithm
Exceeded
Auto Erase Algorithm
Time Limits Erase Suspend Program
Q7
Q7
0
Q7
Toggle
Toggle
Toggle
Toggle
0
1
1
1
N/A
N/A
1
N/A
N/A
No Toggle
Toggle
N/A
Data
Q7
0
1
Toggle
Toggle
No
Toggle
Data
Data
Data
Data
Q6
Q5
Note2
0
0
0
N/A
1
N/A
No Toggle
Toggle
Toggle
Q3
Q2
Note:
1. Q7 and Q2 require a valid address when reading status information. Refer to the appropriate subsection for further
details.
2. Q5 switches to '1' when an Auto Program or Auto Erase operation has exceeded the maximum timing limits.
See "Q5:Exceeded Timing Limits " for more information.
P/N:PM0538
REV. 1.6, AUG. 08, 2001
8
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