MBM29DL32XTE Fujitsu Microelectronics, Inc., MBM29DL32XTE Datasheet - Page 40

• Manufacturer Part Number: MBM29DL32XTE
• Description: Flash Memory 32m 4m X 8/2m X 16 Bit Dual Operation
• Manufacturer: Fujitsu Microelectronics, Inc.

MBM29DL32XTE/BE
-80/90/12
Multiple sectors may be erased concurrently by writing the six bus cycle operations on Table 5. This sequence
is followed with writes of the Sector Erase command to addresses in other sectors desired to be concurrently
erased. The time between writes must be less than “t
” otherwise that command will not be accepted and
TOW
erasure will start. It is recommended that processor interrupts be disabled during this time to guarantee this
condition. The interrupts can be re-enabled after the last Sector Erase command is written. A time-out of “t
”
TOW
from the rising edge of last CE or WE whichever happens first will initiate the execution of the Sector Erase
command(s). If another falling edge of CE or WE, whichever happens first occurs within the “t
” time-out
TOW
window the timer is reset. (Monitor DQ
to determine if the sector erase timer window is still open, see section
3
DQ
, Sector Erase Timer.) Any command other than Sector Erase or Erase Suspend during this time-out period
3
will reset the devices to the read mode, ignoring the previous command string. Resetting the devices once
execution has begun will corrupt the data in the sector. In that case, restart the erase on those sectors and allow
them to complete. (Refer to the Write Operation Status section for Sector Erase Timer operation.) Loading the
sector erase buffer may be done in any sequence and with any number of sectors (0 to 38).
Sector erase does not require the user to program the devices prior to erase. The devices automatically program
all memory locations in the sector(s) to be erased prior to electrical erase (Preprogram function). When erasing
a sector or sectors the remaining unselected sectors are not affected. The system is not required to provide any
controls or timings during these operations.
The system can determine the status of the erase operation by using DQ
(Data Polling), DQ
(Toggle Bit), or
7
6
RY/BY.
The sector erase begins after the “t
” time out from the rising edge of CE or WE whichever happens first for
TOW
the last sector erase command pulse and terminates when the data on DQ
is “1” (See Write Operation Status
7
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.
Figure 23 illustrates the Embedded Erase
TM
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. The Erase Suspend command will be ignored if
written during the Chip Erase operation or Embedded Program Algorithm. 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 “t
” to suspend the erase operation. When the devices have entered the erase-suspended mode, the
SPD
RY/BY output pin will be at Hi-Z and the DQ
bit will be at logic “1”, and DQ
will stop toggling. The user must
7
6
use the address of the erasing sector for reading DQ
and DQ
to determine if the erase operation has been
6
7
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 DQ
to toggle. (See the section on DQ
.)
2
2
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
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