MX29F040
SECTOR ERASE COMMANDS
The Automatic Sector Erase does not require the device
to be entirely pre-programmed prior to executing the Au-
tomatic 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, which-
ever happens later, while the command (data) is latched
on the rising edge of WE or CE, whichever happens first.
Sector addresses selected are loaded into internal reg-
ister on the sixth falling edge of WE or CE, whichever
happens later. Each successive sector load cycle
started by the falling edge of WE or CE, whichever hap-
pens later must begin within 30us from the rising edge
of the preceding WE or CE, whichever happens 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 Sec-
tor 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. 2.3, DEC. 10, 2004
8
MCNIX [ MACRONIX INTERNATIONAL ]
