MX29LV640BXBC-90 MCNIX [Macronix International], MX29LV640BXBC-90 Datasheet - Page 25

• Manufacturer Part Number: MX29LV640BXBC-90
• Description: 64M-BIT [8M x 8/4M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
• Manufacturer: MCNIX [Macronix International]

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 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,
and therefore will only be responded during Automatic
Sector Erase operation. When the Erase Suspend com-
P/N:PM0920
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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
device immediately terminates the time-out period and
suspends the erase operation. After this command has
been executed, the command register will initiate erase
suspend 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 re-
spond to the Erase Resume, program data to, or read
data from any sector not selected for erasure.
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.
QUERY COMMAND AND COMMON FLASH
INTERFACE (CFI) MODE
MX29LV640T/B is capable of operating in the CFI mode.
This mode all the host system to determine the manu-
facturer of the device such as operating parameters and
configuration. Two commands are required in CFI mode.
Query command of CFI mode is placed first, then the
Reset command exits CFI mode. These are described in
Table 3.
The single cycle Query command is valid only when the
device is in the Read mode, including Erase Suspend,
Standby mode, and Read ID mode; however, it is ignored
otherwise.
The Reset command exits from the CFI mode to the
Read mode, or Erase Suspend mode, or read ID mode.
The command is valid only when the device is in the CFI
mode.
MX29LV640T/B
REV. 1.2, NOV. 05, 2003