MX29LV320CB Macronix International, MX29LV320CB Datasheet - Page 19

• Manufacturer Part Number: MX29LV320CB
• Description: 32M-BIT [4M x 8 / 2M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
• Manufacturer: Macronix International

SECTOR ERASE COMMANDS
The device does not require the system to entirely
pre-program 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
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 successive
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#, 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 Sector
Erase(30H) or Erase Suspend(B0H) during the time-
out period resets the device to read mode.
ERASE SUSPEND
This command only has meaning while the state ma-
chine is executing Automatic Sector Erase operation,
P/N:PM1188
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MX29LV320C T/B
and therefore will only be responded during Automatic
Sector Erase operation. When the Erase Suspend com-
mand is issued during the sector erase operation, the
device requires a maximum 20us to suspend the sector
erase operation. However, When the Erase Suspend com-
mand is written during the sector erase time-out, the de-
vice immediately terminates the time-out period and sus-
pends the erase operation. After this command has been
executed, the command register will initiate erase sus-
pend mode. The state machine will return to read mode
automatically after suspend is ready. At this time, state
machine only allows the command register to respond to
the Erase Resume, program data to, or read data from
any sector not selected for erasure. The system can use
Q7, or Q6 and Q2 together, to determine if a sector is
actively erasing or is erase-suspended.
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 blocks.
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.
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REV. 1.0, AUG. 02, 2005