MBM29DL32XTE/BE80/90
section.) at which time the devices return to the read mode. Data polling and Toggle Bit must be performed at
an address within any of the sectors being erased.
Multiple Sector Erase Time; [Sector Erase Time + Sector Program Time (Preprogramming) ] × Number of Sector
Erase
In case of multiple sector erase across bank boundaries, a read from bank (read-while-erase) can not perform.
“Embedded EraseTM Algorithm” in “■ FLOW CHART” illustrates the Embedded EraseTM Algorithm using typical
command strings and bus operations.
• Erase Suspend/Resume
The Erase Suspend command allows the user to interrupt a Sector Erase operation and then perform data reads
from or programs to a sector not being erased. This command is applicable ONLY during the Sector Erase
operation which includes the time-out period for sector erase. Writing the Erase Suspend command (B0h) during
the Sector Erase time-out results in immediate termination of the time-out period and suspension of the erase
operation.
Writing the Erase Resume command (30h) resumes the erase operation. The bank addresses of sector being
erasing or suspending should be set when writing the Erase Suspend or Erase Resume command.
When the Erase Suspend command is written during the Sector Erase operation, the device will take a maximum
of “tSPD” to suspend the erase operation. When the devices have entered the erase-suspended mode, the
RY/BY output pin will be at high impedence state and the DQ7 bit will be at logic “1”, and DQ6 will stop toggling.
The user must use the address of the erasing sector for reading DQ6 and DQ7 to determine if the erase operation
has been suspended. Further writes of the Erase Suspend command are ignored.
When the erase operation has been suspended, the devices default to the erase-suspend-read mode. Reading
data in this mode is the same as reading from the standard read mode except that the data must be read from
sectors that have not been erase-suspended. Successively reading from the erase-suspended sector while the
device is in the erase-suspend-read mode will cause DQ2 to toggle. (See the section on DQ2.)
After entering the erase-suspend-read mode, the user can program the device by writing the appropriate com-
mand sequence for Program. This program mode is known as the erase-suspend-program mode. Again, pro-
gramming in this mode is the same as programming in the regular Program mode except that the data must be
programmed to sectors that are not erase-suspended. Successively reading from the erase-suspended sector
while the devices are in the erase-suspend-program mode will cause DQ2 to toggle. The end of the erase-
suspended Program operation is detected by the RY/BY output pin, Data polling of DQ7 or by the Toggle Bit I
(DQ6) which is the same as the regular Program operation. Note that DQ7 must be read from the Program address
while DQ6 can be read from any address within bank being erase-suspended.
To resume the operation of Sector Erase, the Resume command (30h) should be written to the bank being erase
suspended. Any further writes of the Resume command at this point will be ignored. Another Erase Suspend
command can be written after the chip has resumed erasing.
• Extended Command
(1) Fast Mode
MBM29DL32XTE/BE has Fast Mode function. This mode dispenses with the initial two unclock cycles required
in the standard program command sequence by writing Fast Mode command into the command register. In this
mode, the required bus cycle for programming is two cycles instead of four bus cycles in standard program
command. (Do not write erase command in this mode.) The read operation is also executed after exiting this
mode. To exit this mode, it is necessary to write Fast Mode Reset command into the command register. The first
cycle must contain the bank address. (Refer to the “Extended Sector Group Protection Algorithm” in “■ FLOW
CHART”.) The VCC active current is required even CE = VIH during Fast Mode.
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SPANSION [ SPANSION ]
