MX29LV800C T/B
SECTOR ERASE COMMANDS
Erase operation. When the Erase Suspend Command is
issued during the sector erase operation, the device re-
quires a maximum 20us to suspend the sector erase
operation.However, when the Erase Suspend command
is written during the sector erase time-out, the device
immediately terminates the time-out period and suspends
the erase operation. After this command has been ex-
ecuted, the command register will initiate erase suspend
mode. The state machine will return to read mode auto-
matically after suspend is ready. At this time, state ma-
chine only allows the command register to respond to
Erase Resume, program data to , or read data from any
sector not selected for erasure.
The Automatic Sector Erase does not require the device
to be entirely pre-programmed prior to executing the Au-
tomatic Sector Erase Set-up command and Automatic
Sector Erase command. Upon executing the Automatic
Sector Erase command, the device will automatically pro-
gram and verify the sector(s) memory for an all-zero data
pattern. The system is not required to provide any con-
trol 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 either the data on Q7 is "1" at which time the de-
vice returns to the Read mode, or 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.
The system can determine the status of the program
operation using the Q7 or Q6 status bits, just as in the
standard program operation.After an erase-suspend pro-
gram operation is complete, the system can once again
read array data within non-suspended sectors.
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 "un-
lock" 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 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 register on the sixth falling edge of
WE# or CE#, whichever happens later. Each succes-
sive sector load cycle started by the falling edge of WE#
or CE#, whichever happens later must begin within 50us
from the rising edge of the preceding WE# or CE#, which-
ever 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 EraseTimer.) Any command other
than Sector Erase (30H) or Erase Suspend (B0H) during
the time-out period resets the device to read mode.
ERASE RESUME
This command will cause the command register to clear
the suspend state and return back to Sector Erase mode
but only if an Erase Suspend command was previously
issued. Erase Resume will not have any effect in all
other conditions.Another Erase Suspend command can
be written after the chip has resumed erasing.The mini-
mum time from Erase Resume to next Erase Suspend
is 400us.Repeatedly suspending the device more often
may have undetermined effects.
WORD/BYTE PROGRAM COMMAND SEQUENCE
The device programs one byte of data for each program
operation. The command sequence requires four bus
cycles, and is initiated by writing two unlock write cycles,
followed by the program set-up command. The program
address and data are written next, which in turn initiate
the Embedded Program algorithm. The system is not
required to provide further controls or timings. The device
automatically generates the program pulses and verifies
the programmed cell margin. Table 1 shows the address
and data requirements for the byte program command
sequence.
ERASE SUSPEND
When the Embedded Program algorithm is complete, the
device then returns to reading array data and addresses
are no longer latched. The system can determine the
status of the program operation by using Q7, Q6, or RY/
This command only has meaning while the state ma-
chine is executing Automatic Sector Erase operation, and
therefore will only be responded during Automatic Sector
P/N:PM1183
REV. 1.4, APR. 24, 2006
16
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