MBM29DL32TF Fujitsu, MBM29DL32TF Datasheet - Page 33

• Manufacturer Part Number: MBM29DL32TF
• Description: 32M-Bit Dual Operation Flash Memory
• Manufacturer: Fujitsu

32
MBM29DL32TF/BF
6. Sector Erase
7. Erase Suspend/Resume
Chip Erase Time
“2. Embedded Erase
command strings and bus operations.
Sector erase is a six bus cycle operation. There are two “unlock” write cycles. These are followed by writing the
“set-up” command. Two more “unlock” write cycles are then followed by the Sector Erase command. The sector
address (any address location within the desired sector) is latched on the falling edge of CE or WE whichever
happens later, while the command (Data
After time-out of “t
Multiple sectors may be erased concurrently by writing the six bus cycle operations on “MBM29DL32TF/BF
Command Definitions Table” in DEVICE BUS OPERATION. 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
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
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
if the sector erase timer window is still open, see “16. DQ
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 “12. Write Operation Status” 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
RY/BY.
The sector erase begins after the “t
the last sector erase command pulse and terminates when the data on DQ
Status”.) 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
In case of multiple sector erase across bank boundaries, a read from bank (read-while-erase) can not perform.
“2. Embedded Erase
command strings and bus operations.
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 “t
RY/BY output pin will be at High-Z and the DQ
use the address of the erasing sector for reading DQ
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
SPD
” to suspend the erase operation. When the devices have entered the erase-suspended mode, the
TOW
TOW
” otherwise that command will not be accepted and erasure will start. It is recommended that
Sector Erase Time
” from the rising edge of the last sector erase command, the sector erase operation will begin.
TM
TM
Algorithm” in FLOW CHART illustrates the Embedded Erase
Algorithm” in FLOW CHART illustrates the Embedded Erase
[Sector Erase Time
Sector Erase
TOW
-70
” time out from the rising edge of CE or WE whichever happens first for
All sectors
30h) is latched on the rising edge of CE or WE which happens first.
TOW
7
” time-out window the timer is reset. (Monitor DQ
bit will be at logic “1”, and DQ
Chip Program Time (Preprogramming)
Sector Program Time (Preprogramming) ]
6
and DQ
3
TOW
Sector Erase Timer”.) Resetting the devices once
” from the rising edge of last CE or WE whichever
7
to determine if the erase operation has been
7
(Data Polling) , DQ
7
6
is “1” (See “12. Write Operation
will stop toggling. The user must
TM
TM
Algorithm using typical
Algorithm using typical
6
(Toggle Bit) , or
3
to determine
Number of